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1
Sui, Chuan-Yi, Yu-Sheng Shen, Yu-Min Wen, and Bo Gao. "Application of the Modified Mohr–Coulomb Yield Criterion in Seismic Numerical Simulation of Tunnels." Shock and Vibration 2021 (November 25, 2021): 1–20. http://dx.doi.org/10.1155/2021/9968935.
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To solve the classical problem that the Mohr–Coulomb yield criterion overestimates the tensile properties of geotechnical materials, a modified Mohr–Coulomb yield criterion that includes both maximum tensile stress theory and smooth processing was established herein. The modified Mohr–Coulomb constitutive model is developed using the user-defined material subroutine (UMAT) available in finite element software ABAQUS, and the modified Mohr–Coulomb yield criterion is applied to construct a numerical simulation of a shaking table model test. Compared with the measured data from the shaking table test, the accuracies of the classical Mohr–Coulomb yield criterion and the modified Mohr–Coulomb yield criterion are assessed. Compared to the shaking table test, the classical Mohr–Coulomb model has a relatively large average error (−6.98% in peak acceleration values, −8.47% in displacement values, −23.93% in axial forces), while the modified Mohr–Coulomb model has a smaller average error (+2.71% in peak accelerations value, +3.19% in displacements value, +7.56% in axial forces). The results of numerical simulation using the modified Mohr–Coulomb yield criterion are closer to the measured data.
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Yan, Zhi Xin, Jian Duan, Ping Jiang, and Hou Yu Wang. "A Study on Constitutive Model and Parameters of Rock Slope Stability." Materials Science Forum 575-578 (April 2008): 1210–16. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.1210.
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In this paper, taking elastic and plastic characteristics of rock into account, the authors have studied the relationship between different constitutive models. By transforming material parameters merely, on the basis of Equivalent Mohr-Coulomb Yield Criterion, the researchers achieved the application of these relationship in the computer program-Ansys5.7. They also have discussed the magnitude relationship between the transformed parameters and the original ones. By analyzing the cases of rock slope with obvious sliding surface, the researchers proved that it is liable to replace Mohr-Coulomb Yield Criterion with Equivalent Mohr-Coulomb Yield Criterion. We can use Equivalent Mohr-Coulomb Yield Criterion to simulate rock material, the results are smaller and more conservative than the standard ones. Meanwhile, the authors indicate that it is beneficial to apply Equivalent Mohr-Coulomb Yield Criterion to simulate rock material in rock slope projects with obvious sliding surface which have accurate standard requirements about displacement.
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Jiang, Zhu Jin, Wu Jun Cai, and Dao Sheng Ling. "Coulomb-Cam Model for Dilatancy and Work-Softening of Sand." Advanced Materials Research 446-449 (January 2012): 1602–5. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1602.
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Cambridge model gets the extensive application, which has advantages of rigorous theoretical derivation and model parameters which can entirely be obtained by triaxial tests, while it has deficiencies of the narrow applicative scope and describing the dilatancy hardly. As the most widely used strength theory, Mohr-Coulomb model can directly represent shear strength of soil material simply, without consideration for compression deformation yet. On account of the critical state of dilatancy defined comprehensively, this paper based on the description of dilatancy combines the advantage of Cambridge model and Mohr-Coulomb strength theory, applying to compression deformation and conciseness of Mohr-coulomb model, reflecting shear deformation and puts forward an elastic-plastic model—Coulomb-Cam model. At last, this constitutive model, proved by the contrast of numerical simulation and GDS triaxial tests is of the priority in representing the dilatancy and work-softening rationally.
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Tschuchnigg, Franz, Gertraud Medicus, and Barbara Schneider-Muntau. "Slope stability analysis: Barodesy vs linear elastic – perfectly plastic models." E3S Web of Conferences 92 (2019): 16014. http://dx.doi.org/10.1051/e3sconf/20199216014.
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The results of slope stability analysis are not unique. Different factors of safety are obtained investigating the same slope. The differences result from different constitutive models including different failure surfaces. In this contribution, different strength reduction techniques for two different constitutive models (linear elastic - perfectly plastic model using a Mohr-Coulomb failure criterion and barodesy) have been investigated on slope stability calculations for two different slope inclinations. The parameters for Mohr – Coulomb are calibrated on peak states of element tests simulated with barodesy for different void ratios. For both slopes the predictions of the factors of safety are higher with barodesy than with Mohr-Coulomb. The difference is to some extend explained by the different shapes of failure surfaces and thus different values for peak strength under plane strain conditions. The plane strain predictions of Mohr-Coulomb are conservative compared to barodesy, where the failure surface coincides with Matsuoka-Nakai.
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Li, Ning, Biao Ma, and Hao Wang. "Strains Comparisons of Unbound Base/Subbase Layer Using Three Elasto-Plastic Models under Repeated Loads." Applied Sciences 11, no. 19 (October 5, 2021): 9251. http://dx.doi.org/10.3390/app11199251.
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The constitutive model is the crucial part for the finite element analyses. To study the elasto-plastic properties of unbound granular materials (UGMs) under repeated vehicular loads, an elasto-plastic constitutive model called revised spatially mobilized plane (SMP) was proposed and validated. In this study, the revised SMP model was used for the plastic strain analyses of a typical three-layer pavement structure. To make comparisons, the Mohr-Coulomb and Druck-Prager models were employed for the numerical computation. The results show that plastic tensile and compressive strains in the horizontal and vertical directions appear on the top surface of UGM using the revised SMP model, but no plastic strains are produced by the Mohr-Coulomb and Druck-Prager models. The distribution of plastic strains in the revised SMP model had a good relationship with the actual loading areas under the vehicular loading, which related to the rutting. With the Mohr-Coulomb and Druck-Prage models, a great plastic strain was produced during the first several loading cycles and hardly increased in the following loading cycles, while the plastic strain in the revised SMP model presented an obvious increasing tendency with increased loading cycles. The predicted permanent deformations of the revised SMP, Mohr-Coulomb and Druck-Prage models were 0.557 mm, 0.78 mm and 0.155 mm, respectively. Our work reveals that the Mohr-Coulomb model may over-predict and Druck-Prage model may under-predict the rutting of pavement in early loading stage and the results proved that the revised SMP model had advantages in the description of the plastic strain of UMG under repeated loads.
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Wang, Ruofan, Feitao Zeng, and Li Li. "Applicability of Constitutive Models to Describing the Compressibility of Mining Backfill: A Comparative Study." Processes 9, no. 12 (November 26, 2021): 2139. http://dx.doi.org/10.3390/pr9122139.
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The compressibility of mining backfill governs its resistance to the closure of surrounding rock mass, which should be well reflected in numerical modeling. In most numerical simulations of backfill, the Mohr–Coulomb elasto-plastic model is used, but is constantly criticized for its poor representativeness to the mechanical response of geomaterials. Finding an appropriate constitutive model to better represent the compressibility of mining backfill is critical and necessary. In this paper, Mohr–Coulomb elasto-plastic model, double-yield model, and Soft Soil model are briefly recalled. Their applicability to describing the backfill compressibility is then assessed by comparing numerical and experimental results of one-dimensional consolidation and consolidated drained triaxial compression tests made on lowly cemented backfills available in the literature. The comparisons show that the Soft Soil model can be used to properly describe the experimental results while the application of the Mohr–Coulomb model and double-yield model shows poor description on the compressibility of the backfill submitted to large and cycle loading. A further application of the Soft Soil model to the case of a backfilled stope overlying a sill mat shows stress distributions close to those obtained by applying the Mohr–Coulomb model when rock wall closure is absent. After excavating the underlying stope, rock wall closure is generated and exercises compression on the overlying backfill. Compared to the results obtained by applying the Soft Soil model, an application of the Mohr–Coulomb model tends to overestimate the stresses in the backfill when the mine depth is small and underestimate the stresses when the mine depth is large due to the poor description of fill compressibility. The Soft Soil model is recommended to describe the compressibility of uncemented or lightly cemented backfill with small cohesions under external compressions associated with rock wall closure.
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Sun, Hai Jian, and Yong Quan Li. "Numerical Analysis of the Excavation of Deep Pit Based on Mohr-Coulomb Failure Model." Advanced Materials Research 919-921 (April 2014): 697–700. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.697.
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The Principles of Mohr-Coulomb failure model and hardening and rate dependence are dealt with in detail. Based on Mohr-Coulomb failure model with isotropic hardening, numerical analysis is conducted . The results calculated show that the horizontal displacement and moment of the continuous wall, and the subsidence of surface outside the pit agree with the objective laws during the excavation. The method adopted and those results gained by numerical method may provide reference to engineering practice.
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Poklopová, Tereza, Veronika Pavelcová, and Michal Šejnoha. "COMPARING THE HOEK-BROWN AND MOHR-COULOMB FAILURE CRITERIA IN FEM ANALYSIS." Acta Polytechnica CTU Proceedings 30 (April 22, 2021): 69–75. http://dx.doi.org/10.14311/app.2021.30.0069.
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This paper revisits the issue of a potential substitutions of the Hoek-Brown failure model by the standard Mohr-Coulomb model in the stability analysis of rock masses. The derivation of equivalent shear strength parameters of the Mohr-Coulomb proposed by Hoek et al. [1] is addressed with emphases on the suitable range of stresses for which the equivalence of the two failure criteria applies. To that end, a simple numerical analysis of the oedometric test is carried out. It is seen that a correct choice of the upper limit of the minimum compressive principal stress is crucial for the Mohr-Coulomb model to provide predictions comparable to the Hoek-Brown model. This issue is addressed next in the light of the solution of slope stability problem. All the presented results were derived with the help of the GEO5 FEM finite element software [2].
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Sitorus, Pangeran Holong, and Sri Wulandari. "Pengaruh Perilaku Tinggi Muka Air Tanah dengan Variasi Kemiringan Lereng Terhadap Stabilitas Lereng Berbasis Pemodelan Numerik." Jurnal Teknik Sipil 29, no. 2 (August 18, 2022): 145–52. http://dx.doi.org/10.5614/jts.2022.29.2.5.
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Abstrak Masalah stabilitas lereng cukup umum dan tersebar luas di banyak proyek teknik sipil. Banyak kasus kelongsoran lereng alami yang disebabkan oleh faktor air, seperti air di permukaan maupun aliran air di dalam tanah. Tujuan dilakukannya penelitian ini untuk membuktikan pengaruh tinggi muka air tanah terhadap stabilitas lereng berbasis pemodelan numerik dengan meninjau nilai faktor keamanan lereng. Penelitian ini dilakukan dengan memodelkan tiga lereng dengan kemiringan yang berbeda menggunakan data tanah masing-masing sebagai Mohr-Coulomb Model dan Soft Soil Model dengan membuat variasi tinggi muka air tanah pada software Plaxis. Hasil yang didapat dari penelitian ini adalah adanya kenaikan nilai faktor keamanan Mohr-Coulomb Model sebesar 1,20 pada lereng Cipendawa, 0,97 pada lereng Semarang dan 1,36 pada lereng Tangerang Selatan sedangkan untuk Soft Soil Model terjadi kenaikan sebesar 1,07 pada lereng Cipendawa, 0,91 pada lereng Semarang dan 1,26 pada lereng Tangerang Selatan. Kenaikan nilai faktor keamanan ini ditinjau dari kondisi muka air tanah 0,5 meter sampai 5,5 meter. Adanya perubahan muka air tanah mempengaruhi nilai faktor keamanan dikarenakan tekanan air pori dapat menimbulkan gaya angkat dan dapat menurunkan kekuatan suatu massa tanah atau batuan penyusun lereng tersebut. Kata-kata Kunci: Muka air tanah, faktor keamanan, mohr-coulomb model, soft soil model. Abstract Slope stability problems are quite common and wide-spread in many civil engineering projects. Many cases of slope failure are caused by groundwater or underground water flow. The aim of this paper is to ensure the effect of groundwater level on slope stability based on numerical modeling by focusing on the value of the safety factor. This paper was conducted by modeling slopes from three different locations which have various angles of inclination using its soil data as Mohr-Coulomb Model and Soft Soil Model by varying the groundwater level in Plaxis. The results obtained from this study is an increment in safety factor value by 1,20 on the slope of Cipendawa, 0,97 on the slope of Semarang and 1,36 on the slope of South Tangerang using Mohr-Coulomb Model. The results generated from Soft Soil Model are safety factor value increment by 1,07 on Cipendawa, 0,91 on Semarang and 1,26 on South Tangerang. The increment of safety factor is being analyzed from the groundwater level fluctuations from 0.5 meters to 5.5 meters. The groundwater level fluctuation could affect the safety factor value because pore water pressure cause lifting and shall reduce the strength of soil mass of the slope. Keywords: Groundwater level, safety factor, mohr-coulomb model, soft soil model.
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Galic, Mirela, Pavao Marovic, and Zeljana Nikolic. "Modified Mohr‐Coulomb – Rankine material model for concrete." Engineering Computations 28, no. 7 (October 11, 2011): 853–87. http://dx.doi.org/10.1108/02644401111165112.
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Cui, X. Z., Q. Jin, Q. S. Shang, and S. T. Liu. "Mohr-Coulomb Model Considering Variation of Elastic Modulus and Its Application." Key Engineering Materials 306-308 (March 2006): 1445–48. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.1445.
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Mohr-Coulomb model is a perfect elastoplastic model. It only considers the variation of material strength with lateral compressive stress, but doesn’t consider the variation of elastic modulus with lateral compressive stress and stress level and this is accordant with the true characteristic of geological material. The elasticity modulus in Mohr-Coulomb model was modified by employing the processing method of tangential modulus in Duncan-Chang nonlinear elastic model. In modified model, the stress-strain curve in elastic phrase behaves as hyperbola. In order to embed the modified model in FLAC3D program (Fast Lagrangian Analysis of Continua in 3 Dimensions), a preprocessing program was written and was employed to analyze numerically the bearing capacity of rigid piles loaded laterally.
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Wang, Tuo, Jucai Chang, and Hongda Wang. "A Study of the Deformation Law of the Surrounding Rock of a Laminated Roadway Based on FLAC3D Secondary Development." Applied Sciences 13, no. 10 (May 15, 2023): 6077. http://dx.doi.org/10.3390/app13106077.
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To investigate and analyze the influence of different stress environments on the deformation and destabilization of the rocks surrounding laminated roadways under high stress, this study conducted numerical simulations of coal–rock combination under different circumferential pressures and of the surrounding rocks of highly stressed laminated roadways under different lateral pressure coefficients. In addition, a new custom constitutive structure model was constructed based on the Mohr–Coulomb criterion and realized in FLAC3D software by combining field working conditions. The model was then developed in FLAC3D software for a second time. The results show that the calculated results of the model in this study are in good agreement with the experimental results and the errors are small, while the calculated results of the Mohr–Coulomb model differ from the experimental values under two types of surrounding rock pressure. The deformation of the Mohr–Coulomb model is significantly smaller than that of the customized model, which verifies the reasonableness and superiority of the self-built model in combination with the field conditions. This provides theoretical and practical bases for the design and optimization of stratigraphic roadway support in underground coal mines.
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Pauli, Alexander, Michael A. Kraus, and Geralt Siebert. "Experimental and numerical investigations on glass fragments: shear-frame testing and calibration of Mohr–Coulomb plasticity model." Glass Structures & Engineering 6, no. 1 (February 22, 2021): 65–87. http://dx.doi.org/10.1007/s40940-020-00143-5.
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AbstractThe numerical treatment of the residual load-bearing behavior of laminated glasses (LG) in the post-fractured state is highly topical. Nevertheless, currently only few numerical approaches for an accurate representation of the experimentally observed behavior are existent. In order to model the characteristics of the load-bearing behavior of glass laminates in the post-fractured state, the behavior of the interlayer, the behavior of the glass fragments as well as the bonding between glass and interlayer need to be characterized correctly. This paper focuses on the modeling of the frictional contacts between the glass fragments itself. In order to allow for the calibration of failure criteria for the fractured glass particles, framed shear tests which are a common experimental technique in geomechanical testing to determine the shear strength of soils, are performed on glass fragments of different thicknesses and levels of thermal pre-stress. The test results are subsequently used to calibrate non-associated Mohr–Coulomb criteria, which are widely applied to the description of failure and frictional sliding of soils, to the experimental data of four distinct kinds of glass fragments. The obtained parameters of the Mohr–Coulomb models are in magnitude similar to the parameters of standard soils such as sand or gravel. The experimental data further show, that the Mohr–Coulomb model in general can be used to approximate the stress failure plane of the glass fragments but lacks for capturing correctly the plastic volumetric strains (dilation) in Finite Element modelling. Numerical investigations by the Finite Element method showed, that it is possible to reproduce experimental data by using Mohr–Coulomb plasticity models and hence the numerical models are validated for further investigations.
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Hamdhan, Indra Noer, and Yasmin Jihan Fahira Sahib. "PENGARUH TINGGI RIB TERHADAP DEFORMASI PADA KOMBINASI FONDASI SARANG LABA-LABA DAN TIANG BOR DENGAN PENDEKATAN ELEMEN HINGGA TIGA DIMENSI." Jurnal Teknik Sipil 16, no. 2 (August 3, 2021): 73–82. http://dx.doi.org/10.24002/jts.v16i2.4773.
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Spiders Nest Construction (SNC) is the foundation in the form of flat concrete plates which are reinforced with upright ribs and soil repair between ribs. The KSLL and bored pile are combined to obtain a foundation with high structural rigidity. This study reviews the magnitude of deformation that occurs in the foundation model with a variation of rib height KSLL 1 m, 1.5 m, and 2 m which are varied with 10 bored pile with diameter of 0.6 m in zig-zag configuration with the soil model Mohr-Coulomb and Hardening Soil. In the Mohr-Coulomb soil model the stress state limits are explained using friction angles (φ), cohesion (c) and dilatation angles (ψ). In the Hardening Soil model the soil stiffness is explained much more accurately by using three different stiffnesses namely E50 triaxial stiffness, Eur unloading / reloading stiffness and Eoed oedometer stiffness. In contrast to the Mohr-Coulomb model, the Hardening Soil model takes into account modulei dependence on rigidity. This means that all rigidity increases with pressure. Modeling on PLAXIS 3D shows that the most effective deformation occurs on a foundation with a rib thickness of 0.15 with 10 bored pile and a rib height of 1.5 m. The modeling results show the deformation value that occurs in the Hardening Soil soil model with a rib height of 1 m is 17.91 cm, reduced by 31.491% to 12.27 cm when the thickness of the rib is added to 1.5 m. Whereas in the Mohr-Coulomb soil model, the deformation that occurred on the foundation with a rib height of 1 m was 25.43 cm and reduced 48.997% to 12.97 cm when the rib height was added to 1.5 m.
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Hutter, Kolumban, Yongqi Wang, and Shiva P. Pudasaini. "The Savage–Hutter avalanche model: how far can it be pushed?" Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 363, no. 1832 (June 28, 2005): 1507–28. http://dx.doi.org/10.1098/rsta.2005.1594.
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The Savage–Hutter (SH) avalanche model is a depth-averaged dynamical model of a fluid-like continuum implementing the following simplifying assumptions: (i) density preserving, (ii) shallowness of the avalanche piles and small topographic curvatures, (iii) Coulomb-type sliding with bed friction angle δ and (iv) Mohr–Coulomb behaviour in the interior with internal angle of friction ϕ ≥ δ and an ad hoc assumption reducing the number of Mohr's circles in three-dimensional stress states to one. We scrutinize the available literature on information regarding these assumptions and thus delineate the ranges of validity of the proposed model equations. The discussion is limited to relatively large snow avalanches with negligible powder snow component and laboratory sand avalanches starting on steep slopes. The conclusion of the analysis is that the SH model is a valid model for sand avalanches, but its Mohr–Coulomb sliding law may have to be complemented for snow avalanches by a second velocity-dependent contribution. For very small snow avalanches and for laboratory avalanches starting on moderately steep and bumpy slopes it may not be adequate.
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Rivanga, Nadya Utami, and Indra Noer Hamdhan. "Analisis Vacuum Consolidation pada Perbaikan Tanah Lempung Lunak dengan Model Axisymmetric (Hal. 68-79)." RekaRacana: Jurnal Teknil Sipil 4, no. 1 (February 27, 2018): 68. http://dx.doi.org/10.26760/rekaracana.v4i1.68.
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ABSTRAKTanah lempung lunak merupakan jenis tanah yang memiliki kuat geser yang kecil, koefisien permeabilitas yang kecil, kompresibilitas yang besar, dan mempunyai daya dukung rendah. Kondisi tersebut menyebabkan tanah lempung lunak menjadi tantangan pada kontruksi yang akan di bangun diatasnya, sehingga diperlukan perbaikan tanah. Salah satu perbaikan tanah untuk tanah lempung lunak yang banyak dijumpai yaitu vertical drain dan preloading. Pada tugas akhir ini metode tersebut akan dikombinasikan dengan vacuum consolidation. Tegangan vakum yang digunakan pada kasus ini sebesar 50 dan 80 kPa. Analisis yang dilakukan dengan menggunakan program PLAXIS 2D dengan model Axisymmetric. Analisis dilakukan dengan memvariasikan tiga dari sekian banyak soil model yaitu Mohr Coulomb, Hardening Soil, dan Soft Soil. Berdasarkan hasil dari penelitian nilai penurunan, tegangan pori, dan waktu konsolidasi yang dihasilkan berbeda tetapi hasil penurunan soil model dengan Hardening Soil dan Soft Soil tidak terlalu berdeda secara signifikan.Kata Kunci: tanah lempung lunak, vacuum consolidation, Mohr Coulomb, Hardening Soil, Soft Soil, axisymmetric, PLAXIS 2D ABSTRACTSoft clay is a type of soil that has low shear strength, high compressibility, low coeffiecient of permeability and low bearing capacity. The condition caused soft clay soil to be a challenge on the construction that will be built on it, so that it needed soil improvement. The soil improvement for soft clay that often found is vertical drain and preloading. In this final project that method will be combined with vacuum consolidation. The vacuum pressure used in this case amount from 50 and 80 kPa. The analysis was performed using PLAXIS 2D program with Axisymmetric model. The analysis was done by varying the three of soil models Mohr Coulomb, Hardening Soil, and Soft Soil. Based on the settlement of the research, settlement value, pore pressure, and time of consolidation are different but the result of soil models of Hardening Soil and Soft Soil is not significantly differentiated.Keywords: soft clay, vacuum consolidation, Mohr Coulomb, Hardening Soil, Soft Soil, axisymmetric, PLAXIS 2D
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Wongchana, Pongsakorn, and Peerapong Jitsangiam. "Experimental Investigation and Modelling of Claystone from Mae Moh Coal Mine, Thailand." Key Engineering Materials 841 (May 2020): 155–60. http://dx.doi.org/10.4028/www.scientific.net/kem.841.155.
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The open pit mine is excavation soil from the Earth's surface, leading to presence of cut steep slopes with stability-concerned manners. Mae Moh open pit mine has the main component of claystone with ambiguous properties under stress condition changes from mine operations. Therefore, the strength of the claystone must be studied to be used for the slope stability analysis. Shear strength parameters for slope stability analysis were derived from the Triaxial Compression tests. Claystone is a type of sedimentary rock. Therefore, it is necessary to improve the equipment of the triaxial compression strength test to fit with intrinsic soft rock characteristics of the Mae Moh Claystone. Determination of parameters was based on Mohr Coulomb model, because it is the basis for slope stability analysis and can be resulted from the triaxial compression test. In addition, many computer-based programs for slope stability analysis also were relied onthe Mohr Coulomb model, including PLAXIS used in this study. Before the analysis, the model were validated by the function of “Simulation of Lab Test” in PLAXIS. Comparison on triaxial compression test results between the Mohr-Coulomb Model from PLAXIS and triaxial compression tests were made. This article reported the strength characteristics of Mae Moh claystone.
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Woo, Sang Inn, Hoyoung Seo, and Joonyoung Kim. "Critical-state-based Mohr-Coulomb plasticity model for sands." Computers and Geotechnics 92 (December 2017): 179–85. http://dx.doi.org/10.1016/j.compgeo.2017.08.001.
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Mikola, R. G., K. Hatami, and D. Doolin. "Elastic–plastic discontinuous deformation analysis using Mohr–Coulomb model." Mining Technology 120, no. 3 (September 2011): 148–57. http://dx.doi.org/10.1179/1743286311y.0000000006.
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Sui, Zhili, Zhaoguang Li, Yanhua Gao, Yuan Li, Yiwu Zheng, and Yuan Meng. "Development of PMC Numerical Model for Soil and Stone Mixture." Advances in Civil Engineering 2021 (June 25, 2021): 1–9. http://dx.doi.org/10.1155/2021/9967412.
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Soil and stone mixture is widely distributed in China, and its physical and mechanical properties are complex, which has a significant impact on geotechnical engineering. Usually soil and stone mixture shows anisotropic features along or perpendicular to the direction of settled layers, and the strength will be significantly affected by intermediate principal stress. True triaxial tests were carried on, Paul–Mohr–Coulomb (PMC) failure criterion was used for the strength analysis in soil-stone mixture, and related parameters of PMC model were obtained. A user-defined PMC numerical constitutive model was developed for FLAC3D. Composite failure criteria of shear failure and tension cut-off were applied for numerical analysis, and nonassociated flow rule was proposed based on the Mohr–Coulomb model. Verification modelling was applied as well, and deviation between analytical and numerical solutions in strains of X direction, Y direction, and Z direction was 1.0013, 1.0003, and 1.002, respectively.
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Baryakh, Alexander, and Andrey Tsayukov. "Justification of fracture criteria for salt rocks." Frattura ed Integrità Strutturale 16, no. 62 (September 22, 2022): 585–601. http://dx.doi.org/10.3221/igf-esis.62.40.
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The study of salt rocks deformation and fracture processes is an essential part of mining parameters justification for mineral salt deposits. The results of uniaxial compression tests on large salt rock specimens are presented as a loading curve and diagrams of the transverse-longitudinal displacements at various distances from the side faces. Based on an isotropic elastoplastic model, a multivariant numerical simulation was performed. Its purpose was to select of fracture criteria that accurately describe the loading diagram of specimen and its transverse-longitudinal deformations. The following fracture criteria are considered: Tresca with the associated plastic flow rule, the associated and non-associated Mohr-Coulomb, the parabolic analogue of Mohr-Coulomb criterion and the volumetric fracture criterion. Numerical simulation was carried out by the displacement-based finite element method. Three-dimensional hexahedral eight-node isoparametric elements were used for discretization of the solution domain. It has been established that within the elastoplastic model of media the process of uniaxial compression of a large cubic salt rock specimen is adequately described by the linear Mohr-Coulomb fracture criterion with the non-associated plastic flow, as well as by the associated volumetric parabolic yield criterion with the linear isotropic hardening.
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Veselý, Jan. "NUMERICAL MODELLING OF THE SOIL BEHAVIOUR BY USING NEWLY DEVELOPED ADVANCED MATERIAL MODEL." Acta Polytechnica 57, no. 1 (February 28, 2017): 58–70. http://dx.doi.org/10.14311/ap.2017.57.0058.
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This paper describes a theoretical background, implementation and validation of the newly developed Jardine plastic hardening-softening model (JPHS model), which can be used for numerical modelling of the soils behaviour. Although the JPHS model is based on the elasto-plastic theory, like the Mohr-Coulomb model that is widely used in geotechnics, it contains some improvements, which removes the main disadvantages of the MC model. The presented model is coupled with an isotopically hardening and softening law, non-linear elastic stress-strain law, non-associated elasto-plastic material description and a cap yield surface. The validation of the model is done by comparing the numerical results with real measured data from the laboratory tests and by testing of the model on the real project of the tunnel excavation. The 3D numerical analysis is performed and the comparison between the JPHS, Mohr-Coulomb, Modified Cam-Clay, Hardening small strain model and monitoring in-situ data is done.
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Ma, Dian Guang, Zhi Kai Zhang, and Yuan Zhan Wang. "Triaxial Test of Unsaturated Clay and the Engineering Application at the Naji Reservoir in Guangxi Province." Advanced Materials Research 594-597 (November 2012): 327–34. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.327.
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Torrential or atomized rain is one of the key factors that lead to slope deformation and failure. With rain water infiltration, the pore pressure increases and the matric suction decreases even lose, which lead to the soil shear strength sharply reduced and the slope destabilized. This paper selects the in-situ red clay of the Naji reservoir in Guangxi province as research object and investigates the stress-strain characteristics of undisturbed unsaturated red clay under different matric suction conditions by the triaxial test. The numerical verification of test results is conducted by finite element software ABAQUS, using Duncan-Chang model and Mohr-Coulomb model respectively. Comparing with the Duncan-Chang model, Mohr-Coulomb model can reflect the stress-strain behavior of red clay better. And the slope stability of the project in rainfall condition is analyzed by numerical model, which would offer references for the implementation of the revetment engineering.
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Zhang, Hai Bo, and Qun Yi Liu. "The Anisotropy Characteristic of Rock Material Described by the Stress Softening Criterion in Civil Engineering." Advanced Materials Research 568 (September 2012): 226–29. http://dx.doi.org/10.4028/www.scientific.net/amr.568.226.
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In this paper, firstly we utilize the elastic model, which provides the simplest representation of material behavior in civil engineering. This model is valid for homogeneous, isotropic, continuous materials that exhibit linear stress-strain behavior with no hysteresis on unloading. The elastic models include both isotropic and anisotropic elastic models. Then the Mohr-Coulomb model is used which can represent shear failure in soils and rocks in civil engineering and geotechnical engineering. After that, the strain- softening model is founded, which allows representation of nonlinear material softening and hardening behavior based on prescribed variations of the Mohr-Coulomb model properties (cohesion, friction, dilation, tensile strength) as functions of the deviatoric plastic strain. Finally, a case study is done for the stratified rock mass, the elastic modulus of the rock sample for different surrounding compressive are obtained, to exhibit the anisotropy characteristic of this type of rock material
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Jia, Shanpo, Zhenyun Zhao, Guojun Wu, Bisheng Wu, and Caoxuan Wen. "A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and Validation." Geofluids 2020 (March 20, 2020): 1–14. http://dx.doi.org/10.1155/2020/9853782.
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This paper presents a new constitutive model for describing the strain-hardening and strain-softening behaviors of clayey rock. As the conventional Mohr-Coulomb (CMC) criterion has its limitation in the tensile shear region, a modified Mohr-Coulomb (MMC) criterion is proposed for clayey rock by considering the maximal tensile stress criterion. Based on the results of triaxial tests, a coupled elastoplastic damage (EPD) model, in which the elastic and plastic damage laws are introduced to describe the nonlinear hardening and softening behaviors, respectively, is developed so as to fully describe the mechanical behavior of clayey rock. Starting from the implicit Euler integration algorithm, the stress-strain constitutive relationships and their numerical formulations are deduced for finite element implementation in the commercial package ABAQUS where a user-defined material subroutine (UMAT) is provided for clayey rock. Finally, the proposed model is used to simulate the triaxial tests and the results validate the proposed model and numerical implementation.
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Wang, Shiwen, Jiling Feng, and Zhaojian Yang. "Two active plane finite element model in Mohr–Coulomb elastoplasticity." Finite Elements in Analysis and Design 32, no. 4 (July 1999): 213–19. http://dx.doi.org/10.1016/s0168-874x(99)00002-5.
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Moran, Domingo A., Chris P. Pantelides, and Lawrence D. Reaveley. "Mohr-coulomb model for rectangular and square FRP-confined concrete." Composite Structures 209 (February 2019): 889–904. http://dx.doi.org/10.1016/j.compstruct.2018.11.024.
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Tian, Dongshuai, and Hong Zheng. "A Three-Dimensional Elastoplastic Constitutive Model for Geomaterials." Applied Sciences 13, no. 9 (May 6, 2023): 5746. http://dx.doi.org/10.3390/app13095746.
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The Mohr-Coulomb (M-C) failure criterion has been a popular choice for geotechnical analysis because of its simplicity and ease of use. The fact that the M-C criterion disregards the intermediate principal stress’s impact is a significant drawback. As a result, the M-C criterion is only applied to materials under biaxial stress. This paper presents a three-dimensional version of the M-C criterion. The proposed criterion, called the Generalized Mohr-Coulomb (GMC) criterion, considers the intermediate principal stress’s effect, in addition to inheriting the original M-C criterion’s benefits. We obtained the conditions that the strength parameters must satisfy when the GMC criterion fulfills the π plane’s convexity. The GMC criterion can better describe geotechnical materials’ strengths under general stress conditions. Based on an implicit algorithm, the user material subroutine (UMAT) of the three-dimensional GMC model was developed in ABAQUS using the Fortran programming language. The established elastoplastic model’s validity and the program’s accuracy were examined using numerical simulation. Finally, a numerical simulation of a three-dimensional tunnel excavation under various working conditions was performed. The calculation results from the GMC model are precise and have some engineering-related practical significance.
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Hamonangan, Efran Kemala, and Muhammad Yoke Syahputra. "PERBANDINGAN HASIL ANALISIS FINITE ELEMENT UNTUK STABILITAS DAN PENURUNAN TIMBUNAN DENGAN BEBERAPA SOIL MODEL DI LOKASI RENCANA PEMBANGUNAN JALAN TOL SUBANG." Jurnal HPJI 9, no. 1 (January 30, 2023): 1–8. http://dx.doi.org/10.26593/jhpji.v9i1.6434.1-8.
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Abstract
The challenge in designing the Subang Toll Road lies in the original soil conditions, with soil consistency between very soft and soft. This soft soil has low bearing capacity, high compressibility, and low permeability. Soil improvement using soil replacement has been common for soft soil conditions that are not thick, and this soil improvement can increase the bearing capacity of the soil and reduce the thickness of compressible soil. This study aims to perform embankment modeling using PLAXIS 2D software version 22, by comparing 3 soil models, namely the Mohr Coulomb, Hardening Soil, and Soft Soil models. Based on the modeling results, the Advanced Soil Model has a better approach compared to the Mohr Coulomb Model, which is a simple model. The results show that the Hardening Soil Model produces a settlement value that is closest to the results of 1-dimensional Terzaghi calculations. In addition, the Hardening Soil Model is the most conservative soil model, because it provides the highest settlement value, highest excess pore water pressure, and the lowest safety factor.
Keywords: toll road; soil consistency; soft soil; soil replacement; soil model
Abstrak
Tantangan dalam perancangan Jalan Tol Subang adalah pada kondisi tanah asli, dengan konsistensi tanah antara sangat lunak hingga lunak. Tanah lunak ini memiliki daya dukung yang rendah, kompresibilitas yang tinggi, dan permeabilitas yang rendah. Perbaikan tanah menggunakan soil replacement telah biasa dilakukan, untuk kondisi tanah lunak yang tidak tebal, dan perbaikan tanah ini dapat meningkatkan daya dukung tanah serta mengurangi tebal tanah kompresibel. Studi ini bertujuan untuk melakukan pemodelan timbunan dengan menggunakan perangkat lunak PLAXIS 2D versi 22, dengan membandingkan 3 soil model, yaitu model-model Mohr Coulomb, Hardening Soil, dan Soft Soil. Berdasarkan hasil pemodelan yang dilakukan, Advanced Soil Model merupakan pendekatan yang lebih baik dibandingkan dengan Mohr Coulomb Model, yang merupakan model sederhana. Hasil yang diperoleh menunjukkan bahwa Hardening Soil Model menghasilkan nilai penurunan yang paling mendekati hasil perhitungan 1 dimensi Terzaghi. Selain itu, Hardening Soil Model merupakan soil model yang paling konservatif, karena memberikan nilai penurunan yang terjadi dan angka air pori ekses yang paling tinggi serta nilai faktor keamanan yang paling rendah.
Kata-kata kunci: jalan tol; konsistensi tanah; tanah lunak; soil replacement; soil model
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Hong Lam, Dang, Dang Thi Quynh Chi, and Nguyen Ba Dong. "A practical approach for modeling twin-tunnel excavation in Ho chi minh city." Transport and Communications Science Journal 73, no. 7 (September 15, 2022): 724–34. http://dx.doi.org/10.47869/tcsj.73.7.6.
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The prediction of ground settlement under tunnel excavation is still challenge. Almost engineer uses Mohr-Coulomb model in practice due to the conventional geotechnical investigation data. This paper describes the study of tunnel lining behaviors and ground surface settlement under tunneling process with a typical case study of twin tunnels excavation in Ho Chi Minh city, Vietnam. The advanced material model namely Hardening Soil model is used to investigate the proposing twin-tunnel with numerical approach. The internal forces of tunnel lining and ground settlement, which achieved from Hardening Soil model and the available results from Mohr-Coulomb model, are then made comparison between two models which yields some important differences for analysis. Since the experimental works for qualifying stiffness parameters in Hardening Soil model are missed in the Metro Line 1 project in Ho Chi Minh city, an empirical formula is proposed in the paper as a guide for estimating the required data in modelling process
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Dearini J, R. Thasyia Puteri, and Indra Noer Hamdhan. "Analisis Daya Dukung Lateral pada Suction Pile dengan Menggunakan Metode Numerik. (Hal. 96-106)." RekaRacana: Jurnal Teknil Sipil 5, no. 2 (September 25, 2019): 96. http://dx.doi.org/10.26760/rekaracana.v5i2.95.
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ABSTRAKSuction Pile merupakan fondasi berbentuk silinder baja berdiameter besar yang tertutup pada bagian atas dan terbuka pada bagian bawah. Fondasi ini sering digunakan untuk menyokong bangunan offshore dan platforms. Beban yang diterima oleh suction pile merupakan beban aksial yang berasal dari beban strukturnya dan juga beban lateral dari tekanan tanah dan air laut di sekelilingnya. Analisis daya dukung lateral pada suction pile dilakukan dengan menggunakan metode numerik, yaitu menggunakan software PLAXIS 3D dengan soil model Mohr-Coulomb dan Hardening Soil, serta menggunakan metode analisis, yaitu metode COM624 dari Federal Highway Administrasion (FHWA). Pemodelan suction pile dilakukan dengan cara memvariasikan panjang dari suction pile dengan mutu baja, diameter suction pile, dan parameter tanah yang sama. Berdasarkan hasil dari penelitian bahwa semakin panjang penampang dari suction pile yang digunakan, maka daya dukung lateral yang diperoleh semakin meningkat dikarenakan letak titik jepit yang masih berubah.Kata Kunci: suction pile, daya dukung lateral, titik jepit, Mohr-Coulomb, Hardening Soil ABSTRACTSuction pile is a large cylinder-shaped steel foundation which has a closed top and an open bottom. This foundation is often used to support offshore buildings and platforms. The loads resisted by the suction pile are the axial load from its own structure weight and the lateral load caused by soil and deep-sea pressure around it. Analysis of lateral bearing capacity of suction pile is done by using numerical method is conducted using commercial software PLAXIS 3D, with Mohr-Coulomb and Hardening Soil as the soil model and analysis method is conducted using COM624 method from Federal Highway Administrasion (FHWA). Suction pile model is designed by varying the suction pile lengths of equal steel quality, suction pile diameter, and soil parameter. The result of the research showed that the longer the cross section of the suction pile used, the higher its lateral bearing capacity, due to the location of the fixity point is still changed.Keywords: suction pile, lateral bearing capacity, fixity point, Mohr-Coulomb, Hardening Soil.
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Moussai, B. "Numerical Analysis of El-Agrem Concrete Face Rockfill Dam." Soils and Rocks 36, no. 3 (September 1, 2013): 293–98. http://dx.doi.org/10.28927/sr.363293.
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For concrete face rockfill dams, the behaviour of the concrete slab which provides the watertightness of the dam is a major concern. The deformation of the dam embankment during construction and operation leads to concrete slab deformation. This deformation should be compatible with the structural integrity of the concrete slab. This paper presents the numerical analysis of El-Agrem concrete face rockfill dam during reservoir filling using the finite element code Plaxis 2D-2010. Two models are used in this study, the Mohr Coulomb model and the Hardening Soil model to emphasize the impact of constitutive model on the dam deformation. The material stiffness parameters used in constitutive models were calibrated based on the available measured crest settlement. The analysis results indicate that the face slab deformation can be numerically predicted based on monitoring data at the dam crest and the Hardening Soil model gives a maximum slab deformation less than that obtained using Mohr Coulomb model.
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Stefanescu, E. R., M. Bursik, and A. K. Patra. "Effect of digital elevation model on Mohr-Coulomb geophysical flow model output." Natural Hazards 62, no. 2 (March 22, 2012): 635–56. http://dx.doi.org/10.1007/s11069-012-0103-y.
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Pratiwi, Desti, Yuki Achmad Yakin, and Aldo Mahaputra. "Analisis Stabilitas Lereng Batuan dengan Pendekatan Kriteria Keruntuhan Hoek-Brown dan Mohr Coulomb Menggunakan Metode Numerik Plaxis 2D." Publikasi Riset Orientasi Teknik Sipil (Proteksi) 4, no. 2 (December 12, 2022): 74–81. http://dx.doi.org/10.26740/proteksi.v4n2.p74-81.
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Stabilitas lereng merupakan salah satu faktor penting yang harus diperhatikan dalam merancang suatu lereng batuan. Aktivitas penggalian dalam massa batuan dapat mengakibatkan terjadinya kelongsoran atau keseimbangan lereng terganggu. Analisis stabilitas lereng batuan dapat dipengaruhi oleh tiga faktor seperti kekuatan massa batuan, faktor kerusakan akibat peledakan dan geometri lereng. Pada penelitian ini akan dilakukan perbandingan analisis lereng batuan menggunakan model material Hoek-Brown (HB) dan Mohr-Coulomb (MC) berdasarkan persamaan Hoek-Brown Tahun 2002. Klasifikasi massa batuan akan menggunakan sistem Rock Mass Rating (RMR) dan Geological Strength Index (GSI). Metode Elemen Hingga pada program Plaxis 2D digunakan untuk menentukan nilai faktor keamanan. Hasil analisis menunjukkan bahwa selisih perbedaan nilai faktor keamanan antara model HB dan MC tidak signifikan. Nilai perbedaan paling besar yaitu 10%. Selain itu, antara kedua model ini menghasilkan bidang gelincir yang mirip. Sehingga dapat disimpulkan bahwa persamaan Hoek-Brown Tahun 2002 dapat digunakan sebagai korelasi parameter Mohr-Coulomb.
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Li, You Xiang. "Analysis of Surrounding Rock Deformation Based on M-C Model and Cvisc Model." Applied Mechanics and Materials 295-298 (February 2013): 2963–66. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.2963.
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According to the analysis of the surrounding rock deformation of the buried sandy slate, which is 1500-2000m depth of Diversion Tunnel Jinping-II Hydropower Station, the essay uses FLAC software application to analyze the deformation characteristics and plastic zones of the sandy slate, study comparatively the influence of Mohr-Coulomb model and Cvisc model to the surrounding rock, and then draw some conclusions, including that calculations derived by using Cvisc model is more in line with the actual engineering.
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Lelovic, Selimir, and Dejan Vasovic. "Determination of Mohr-Coulomb Parameters for Modelling of Concrete." Crystals 10, no. 9 (September 13, 2020): 808. http://dx.doi.org/10.3390/cryst10090808.
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Cohesion is defined as the shear strength of material when compressive stress is zero. This article presents a new method for the experimental determination of cohesion at pre-set angles of shear deformation. Specially designed moulds are created to force deformation (close to τ-axis) at fixed pre-set values of angle with respect to normal stress σ. Testing is performed on series of concrete blocks of different strengths. From the compressive side, cohesion is determined from the extrapolation of the linear Mohr–Coulomb (MC) model, as the intercept on the shear stress axis. From the tensile stress side (from the left), cohesion is obtained using the Brazilian test results: first, indirect tensile strength of material σtBT is measured, then Mohr circle diagram values are calculated and cohesion is determined as the value of shear stress τBT on the Mohr circle where normal stress (σ)t = 0. A hypothesis is made that cohesion is the common point between two tests. In the numerical part, a theory of ultimate load is applied to model Brazilian test using the angle of shear friction from the MC model. Matching experimental and numerical results confirm that the proposed procedure is applicable in numerical analysis.
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Xu, Bang Shu, Ri Cheng Liu, Ming Gong, and Zhong Yi Zeng. "Research on Auxiliary Pile Group’s Impact to Foundation Pit’s Horizontal Displacement and Analysis on Pile Group’s Equivalent." Applied Mechanics and Materials 166-169 (May 2012): 426–33. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.426.
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Auxiliary pile group closed to foundation pit can improve the stiffness of soil mass and decrease foundation pit’s transformation effectively to guarantee foundation pit’s stability. Drucker-Prager model is used and matched with Mohr-Coulomb model’s circumcircle, which can solve the problems of uncertain viscoplasticity strain rate and discontinuous in cones vertex, compared with Mohr-Coulomb model. Also, numerical simulation software FLAC3D is applied to help analyze foundation pit’s horizontal displacement caused by auxiliary pile group, and sensitivity analysis is done about pile spacing and stiffness. The calculation results compared with monitoring data show that Drucker-Prager model is appropriate to simulate foundation pit. Stiffness of soil mass can be improved obviously by auxiliary pile group. Auxiliary pile group of CFG mainly reduce foundation pit’s upper horizontal displacement while bored piles mainly cut down deep layer’s horizontal displacement of soil mass. The results can provide references to both design and management of foundation pit.
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Ip, Chi F., William D. Hibler, and Gregory M. Flato. "On the effect of rheology on seasonal sea-ice simulations." Annals of Glaciology 15 (1991): 17–25. http://dx.doi.org/10.3189/1991aog15-1-17-25.
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A generalized numerical model which allows for a variety of non-linear rheologies is developed for the seasonal simulation of sea-ice circulation and thickness. The model is used to investigate the effects (such as the role of shear stress and the existence of a flow rule) of different rheologies on the ice-drift pattern and build-up in the Arctic Basin. Differences in local drift seem to be closely related to the amount of allowable shear stress. Similarities are found between the elliptical and square cases and between the Mohr-Coulomb and cavitating fluid cases. Comparisons between observed and simulated buoy drift are made for several buoy tracks in the Arctic Basin. Correlation coefficients to the observed buoy drift range from 0.83 for the cavitating fluid to 0.86 for the square rheology. The average ratio of buoy-drift distance to average model-drift distance for several buoys is 1.15 (square), 1.18 (elliptical), 1.30 (Mohr-Coulomb) and 1.40 (cavitating fluid).
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Ip, Chi F., William D. Hibler, and Gregory M. Flato. "On the effect of rheology on seasonal sea-ice simulations." Annals of Glaciology 15 (1991): 17–25. http://dx.doi.org/10.1017/s0260305500009496.
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A generalized numerical model which allows for a variety of non-linear rheologies is developed for the seasonal simulation of sea-ice circulation and thickness. The model is used to investigate the effects (such as the role of shear stress and the existence of a flow rule) of different rheologies on the ice-drift pattern and build-up in the Arctic Basin. Differences in local drift seem to be closely related to the amount of allowable shear stress. Similarities are found between the elliptical and square cases and between the Mohr-Coulomb and cavitating fluid cases. Comparisons between observed and simulated buoy drift are made for several buoy tracks in the Arctic Basin. Correlation coefficients to the observed buoy drift range from 0.83 for the cavitating fluid to 0.86 for the square rheology. The average ratio of buoy-drift distance to average model-drift distance for several buoys is 1.15 (square), 1.18 (elliptical), 1.30 (Mohr-Coulomb) and 1.40 (cavitating fluid).
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Li, Zong Wei. "Tailings Dam Stress and Deformation Research Based on the Theory of Elastic-Plastic Theory." Applied Mechanics and Materials 204-208 (October 2012): 177–80. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.177.
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This paper introduces the principle of the elastic-plastic model based on Mohr -Coulomb failure criteria, Combination of a tailings dam introduces the modeling analysis process, according to the actual project analyses the stress and deformation calculation results of rationality.
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Yang, Cong Bin, Liang Gu, and Qiang Li. "Finite Element Simulation of Track Shoe and Ground Adhesion." Applied Mechanics and Materials 644-650 (September 2014): 402–5. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.402.
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Soil constitutive model was established based on elastic model and Mohr-Coulomb model. Simplified common form track shoe was determined for finite element modeling. Loading and boundary conditions were determined based on the actual driving conditions of the vehicle. Meshing was based tetrahedron. Finite element model was compared with experiment to verify the validity.
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Chen, Tzu-Yin Kasha, Ying-Chen Wu, Chi-Yao Hung, Hervé Capart, and Vaughan R. Voller. "A control volume finite-element model for predicting the morphology of cohesive-frictional debris flow deposits." Earth Surface Dynamics 11, no. 2 (April 28, 2023): 325–42. http://dx.doi.org/10.5194/esurf-11-325-2023.
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Abstract. To predict the morphology of debris flow deposits, a control volume finite-element model (CVFEM) is proposed, balancing material fluxes over irregular control volumes. Locally, the magnitude of these fluxes is taken proportional to the difference between the surface slope and a critical slope, dependent on the thickness of the flow layer. For the critical slope, a Mohr–Coulomb (cohesive-frictional) constitutive relation is assumed, combining a yield stress with a friction angle. To verify the proposed framework, the CVFEM numerical algorithm is first applied to idealized geometries, for which analytical solutions are available. The Mohr–Coulomb constitutive relation is then checked against debris flow deposit profiles measured in the field. Finally, CVFEM simulations are compared with laboratory experiments for various complex geometries, including canyon–plain and canyon–valley transitions. The results demonstrate the capability of the proposed model and clarify the influence of friction angle and yield stress on deposit morphology. Features shared by the field, laboratory, and simulation results include the formation of steep snouts along lobe margins.
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Wang, Zhi-bin, Jin-feng Zou, and Hai Yang. "A new approach for the fracture grouting pressure in soil mass." Advances in Mechanical Engineering 10, no. 7 (July 2018): 168781401878643. http://dx.doi.org/10.1177/1687814018786435.
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This study focuses on analytical solutions of the fracture grouting pressure. Based on the cavity expansion and fracture grouting mechanism, the small deformation in the elastic zone, large deformation in the plastic zone, and non-associated flow rules are assumed. The solutions of the fracture grouting pressure based on the Unified Strength failure criterion, spatial mobilized plane criterion, Mohr–Coulomb failure criterion, and modified Cambridge model (MMC) are proposed for the large-deformation and small-deformation assumptions, respectively. A parameter analysis was conducted to analyze the differences between large-deformation and small-deformation theories. A comparison of the local test data with theoretical results reveals that the Cambridge model is more suitable for weakly consolidated soil and that the Mohr–Coulomb theory is suitable for over-consolidated soil. For all yield criteria in the study, the analysis indicates that the large-deformation theory has more reliable results than the small-deformation theory. The results in this study can direct the design and operation of fracture grouting.
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Konkol, Jakub. "Numerical Estimation of the Pile Toe and Shaft Unit Resistances During the Installation Process in Sands." Studia Geotechnica et Mechanica 37, no. 1 (March 1, 2015): 37–44. http://dx.doi.org/10.1515/sgem-2015-0005.
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Abstract Numerical simulations of a pile jacking were carried out. A Coupled Eulerian-Lagrangian (CEL) formulation was used to treat with large deformation problems. An Abaqus, a commercial Finite Element Method software suit, was used as a computing environment. The Mohr-Coulomb constitutive model was applied and the Coulomb model of friction was used to describe pile-soil interaction. Calculations were made for three different pile diameters. Toe and shaft unit resistances versus depth for each pile were investigated and plotted. CPT-based solutions were compared with the results of numerical simulations.
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Zhan, Tao, Tengfei Jiang, Shengbiao Shan, Fu Zheng, Annan Jiang, and Xinping Guo. "Research on Constitutive Model and Algorithm of High-Temperature-Load Coupling Damage Based on the Zienkiewicz–Pande Yield Criterion." Applied Sciences 13, no. 17 (August 29, 2023): 9786. http://dx.doi.org/10.3390/app13179786.
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The mechanical properties of rock can be weakened under the influence of high temperatures. To describe the mechanical behavior of rock under the action of high temperature more accurately, based on the Zienkiewicz–Pande yield criterion, the damage variable Dc which accounts for the coupling between high temperature and load is introduced. According to plastic potential theory and plastic flow law, the iterative incremental method for a high-temperature and load-coupled damage constitutive model in Flac3D is deduced in detail and compiled into the corresponding dynamic link library file (.dll file). By modifying the shape function to degenerate into the Mohr–Coulomb constitutive model, an elastic–plastic analysis of an ideal circular tunnel is performed, and a comparison is made between calculation results obtained from the built-in Mohr–Coulomb constitutive model in Flac3D, proving the correctness of the secondary development program. Finally, numerical simulations are conducted to study the effects of high-temperature damage using rock uniaxial compression tests, and the model’s validity is established by comparing it with previous experimental results.
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Ghasempour, Nader, Mahdi Moosavi, and Mohammad Ali Aghighi. "A Micromechanical Model to Estimate Borehole Collapse Pressure." Periodica Polytechnica Civil Engineering 61, no. 3 (February 10, 2017): 581. http://dx.doi.org/10.3311/ppci.9979.
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Borehole collapse is predicted by common rock failure criteriadespite they give conservative results due to some simplificationof rock behavior. It is the source of many difficulties in implementationof oil well, underground structures and foundations.Utilizing damage theory could improve the conservancy of rockfailure criterion. Damage theory considers loss of functionrather than loss of strength. Unlike criteria which were derivedfrom plasticity that assume yielding point as the limit of functionalityof rock, damage theory uses a state between failureand yielding in stress-strain diagram as the limit of the rockapplicability. In this study, a new model is proposed to predictminimum borehole pressure based on rock damage theory. Themodel is verified by actual wellbore data. The proposed modelpredicts minimum borehole pressure close to actual data andmore accurate than Mohr-coulomb and Mogi-Coulomb criteria.
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Lee, Won-Hyo, Soon-Goo Kwon, and Tae-Hyung Kim. "A Study of Lateral Resistance of Block Breakwater Combined with Piles." Journal of Korean Society of Coastal and Ocean Engineers 34, no. 4 (August 31, 2022): 100–108. http://dx.doi.org/10.9765/kscoe.2022.34.4.100.
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Three-dimensional FEM numerical analysis was performed to understand the behaviors of blocks and piles according to the horizontal load for the block breakwater combined with piles. The Modified Mohr-Coulomb model, the improved version of the Mohr-Coulomb model, was applied for the ground modeling. The cases when the pile is embedded only into the block, embedded to the riprap layer (H = 4.29 cm), and embedded to the ground down to 2H, 3H, and 4H were examined. The results of the laboratory model experiment and the numerical analysis showed similar horizontal resistance force-displacement behaviors. The pile showed rotational behavior up to the embedment depth of 1H~2H and bending behavior in the case of 3H~4H depth embedment. When the embedment depth of the pile is 3H or more, the pile shows a bending behavior, so it can be considered that the pile contributes significantly to the horizontal resistance of the block breakwater. The results of this study will be used for various numerical analyses for real-size structure design.
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Duris, Lukas, and Eva Hrubesova. "Numerical Simulation of the Interaction between Fibre Concrete Slab and Subsoil—The Impact of Selected Determining Factors." Sustainability 12, no. 23 (December 1, 2020): 10036. http://dx.doi.org/10.3390/su122310036.
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Shape and material optimization of building structures, including reducing the amount of concrete used, are very important aspects in sustainable construction. Numerical modelling is currently used very effectively to design optimized and sustainable structures, including their interaction with the surrounding rock environment. This paper is focused on the three selected factors of numerical modelling of fibre concrete slab and subsoil interaction: (1) the constitutive model of fibre concrete slab, (2) deformational and strength characteristics of subsoil, (3) effect of interface elements. The specialized geotechnical software Midas GTS NX, based on the finite element method, was used for the modelling of this task. Numerical results were compared with the experimental measurement of vertical displacements on the upper surface of slab. In the presented study, three constitutive models of slab recommended in MIDAS GTS NX code for modelling concrete behaviour (elastic, Mohr-Coulomb and Drucker-Prager) were applied. In addition, the sensitivity analysis with respect to the deformational and strength characteristics of subsoil was performed. The numerical study also presents the effect of the interface elements application on the slab behaviour. The numerical results of maximum vertical displacements based on the Drucker-Prager and elastic model underestimated both the experimental results and numerical results based on the Mohr-Coulomb model. From the qualitative point of view (shape of deflection curve), the numerical simulation showed the better agreement of the Mohr-Coulomb constitutive model with the experimental measurements in comparison with the other two investigated constitutive models. The performed parametric study documented that reduction of the strength and deformational characteristics of subsoil leads to the increase of maximum vertical displacements in the centre of slab, but the experimentally measured deflection curve, including uplift of slab and gapping occurrence between the slab and subsoil, was not achieved without the interface application.
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Nguyễn, Ngọc Thắng, and Văn Thanh Thịnh. "Ứng dụng mô hình nền hardening soil và mohr coulomb trong plaxis 3D mô phỏng tính toán chuyển vị tường vây." Vietnam Institute for Building Science and Technology 2023, vi.vol2 (June 2023): 56–63. http://dx.doi.org/10.59382/j-ibst.2023.vi.vol2-6.
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Diaphragm wall deflection is considered one of the reasons for soil instability around excavation, causing serious consequences for neighboring constructions. Therefore, in the design and calculation of deep excavation, analyzing and simulating the diaphragm wall deflection between phases of excavation construction becomes very important. However, selecting an appropriate mathematical model and determining its input parameters affect the accuracy of the calculation results and their deviation from reality. In this article, the Hardening Soil (HS) model and the Mohr Coulomb (MC) model were used to simulate deflection calculations of diaphragm wall using Plaxis 3D and compared with data obtained from a real project in Ho Chi Minh City. The results showed that the stiffness parameter Eref50 was taken according to the formula Eref50 = 1000N for sandy soil (N: number of SPT blows), Eref50 = 500Su for cohesive soil (Su: undrained soil resistance) in the HS model, resulting in analysis of deflection that was quite compatible with actual data. In addition, the deflection of diaphragm wall varied inversely with its thickness, but this change was relatively small.
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Berdychowski, Maciej, Jan Górecki, and Krzysztof Wałęsa. "Numerical Simulation of Dry Ice Compaction Process: Comparison of the Mohr–Coulomb Model with the Experimental Results." Materials 15, no. 22 (November 10, 2022): 7932. http://dx.doi.org/10.3390/ma15227932.
Full textAbstract:
How to reduce consumption of energy in manufacturing has become a topical issue nowadays. Certain manufacturing processes are known for being highly energy-intensive and compression of materials belongs to this group. This article presents the simulation of the process of compression of dry ice snow with the use of the Mohr–Coulomb model. Two simulation variants were considered in this research. In the first one, constant input parameters were used and in the second one, the input parameters were variable, depending on the changing density of the compressed material. The experimental data were compared with the predicted values to find that the model using constant input parameters was inferior as regards to the goodness of fit. On the other hand, the model with variable input parameters was less accurate in predicting the maximum compression force acting in the process. The last section of this article deals with simulations performed with the Drucker–Prager Cap and modified Cam-Clay models. Finally, it was concluded that the Mohr–Coulomb model yields a more accurate representation of the compression process while requiring less information on the variation of the material parameters.