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Articoli di riviste sul tema "Coulomb-Mohr"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 18 febbraio 2022

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1

Mestat, Philippe. "Loi de Mohr-Coulomb". Revue Française de Génie Civil 1, n. 1 (gennaio 1997): 189–92. http://dx.doi.org/10.1080/12795119.1997.9692109.

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2

Labuz, Joseph F., e Arno Zang. "Mohr–Coulomb Failure Criterion". Rock Mechanics and Rock Engineering 45, n. 6 (3 luglio 2012): 975–79. http://dx.doi.org/10.1007/s00603-012-0281-7.

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3

Yan, Zhi Xin, Jian Duan, Ping Jiang e Hou Yu Wang. "A Study on Constitutive Model and Parameters of Rock Slope Stability". Materials Science Forum 575-578 (aprile 2008): 1210–16. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.1210.

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Abstract (sommario):
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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4

Lee, Youn-Kyou. "Intermediate Principal Stress Dependency in Strength of Transversely Isotropic Mohr-Coulomb Rock". Journal of Korean Society For Rock Mechanics 23, n. 5 (31 ottobre 2013): 383–91. http://dx.doi.org/10.7474/tus.2013.23.5.383.

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5

Liu, Jian Hua, e Wei Shen Zhu. "A New Elastic-Plasticity Yield Criterion for Rock and Soil". Advanced Materials Research 250-253 (maggio 2011): 1342–47. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.1342.

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In this present paper a new yield criterion called M-D criterion is established based on the average of Mohr-Coulomb and Drucker-Prager criterion. The new M-D criterion is integrated with a revised FLAC3D method for mechanical analysis. Comparisons between the results of M-D, Mohr-Coulomb and Drucker-Prager are made by cases study. The study shows that results of M-D criterion are basically between the results of Mohr-Coulomb and Drucker-Prager and have the feature of being medial in quantity.
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6

Török, János, e Stéphane Roux. "Heterogeneous Mohr-Coulomb plastic material". Granular Matter 2, n. 2 (1 maggio 2000): 71–75. http://dx.doi.org/10.1007/s100350050037.

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7

Tschuchnigg, Franz, Gertraud Medicus e 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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8

Jiang, Zhu Jin, Wu Jun Cai e Dao Sheng Ling. "Coulomb-Cam Model for Dilatancy and Work-Softening of Sand". Advanced Materials Research 446-449 (gennaio 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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9

Jung, Yong-Bok, Eui-Seob Park, Dong-Woo Ryu e Dae-Sung Cheon. "Analysis of Whole Tunnel Stability by Using Rock Mass Classification and Mohr-Coulomb Analytical Solution". Journal of Korean Society For Rock Mechanics 23, n. 4 (31 agosto 2013): 280–87. http://dx.doi.org/10.7474/tus.2013.23.4.280.

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10

Gesualdo, A., V. Minutolo e L. Nunziante. "Failure in Mohr–Coulomb soil cavities". Canadian Geotechnical Journal 38, n. 6 (1 dicembre 2001): 1314–20. http://dx.doi.org/10.1139/t01-043.

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In many cavities, resulting from both natural excavation and anthropic action, the phenomenon of the collapse of blocks from the cavity roof presents a serious safety hazard. In a previous publication the authors proposed a method to calculate the shape and dimensions of the collapsing block by means of the upper bound theorem of the plasticity theory. The soft rock material was modelled by means of the Mohr–Coulomb yield criterion, and the associated flow rule was considered for strain plastic velocity. The linear yield criterion was suitably regularized by means of a circle in the tensile zone. The boundary of the collapsing block is described by a paraboloid surface. An optimization procedure formulated in standard Kuhn–Tucker form and an analytical solution were obtained. The above-mentioned algorithm has been successfully applied to common soils of southern Italy. To validate the theoretical formulation, several numerical tests are performed. These tests show an optimal agreement with the closed-form solution. Therefore the proposed modelling may be used as an efficient guideline for the cavity-strengthening design.Key words: roof stability, regularized Mohr–Coulomb material, limit analysis, failure mechanics.
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11

Gesualdo, A., V. Minutolo e L. Nunziante. "Failure in Mohr–Coulomb soil cavities". Canadian Geotechnical Journal 38, n. 6 (2001): 1314–20. http://dx.doi.org/10.1139/cgj-38-6-1314.

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12

Schajer, G. S. "Mohr-Coulomb Failure Criterion Expressed in Terms of Stress Invariants". Journal of Applied Mechanics 65, n. 4 (1 dicembre 1998): 1066–68. http://dx.doi.org/10.1115/1.2791905.

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Abstract (sommario):
A polynomial expression for the Mohr-Coulomb criterion for failure of brittle or frictional materials in terms of stress invariants is derived. The form of the polynomial expression corresponds to the pyramidal shape of the failure surface in principal stress space. The pressure-sensitive character of the failure of a Mohr-Coulomb material is indicated by a linear influence of the first stress invariant I1 in the polynomial expression.
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13

Wang, Shui Lin, Yu Yong Jiao, Haibin Xiao e Chun Guang Li. "Discussion on the Use of Parameters of Drucker-Prager Criterion". Key Engineering Materials 306-308 (marzo 2006): 1449–54. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.1449.

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There are several different yield surfaces of Drucker-Prager yield criterion which corresponds to Mohr-Coulomb yield criterion in principal stress space. The different yield surfaces are determined by parameters in Drucker-Prager criterion. The influence of the different parameters on computational results is discussed in the paper, and the use of the equivalent Drucker-Prager criterion to Mohr-Coulomb criterion is suggested when elastoplastic analysis is performed in engineering problems.
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14

Alexandrov, Sergei E., e Elena A. Lyamina. "A New Method of Calculating the State of Stress in Granular Materials under Plane Strain Conditions". Transportation systems and technology 3, n. 4 (15 dicembre 2017): 89–106. http://dx.doi.org/10.17816/transsyst20173489-106.

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The system of equations comprising the Mohr-Coulomb yield condition and the stress equilibrium equations may be studied independently of the flow law. This system of equations is hyperbolic. Accordingly, to solve the aforementioned system of equations, it is reasonable to apply the method of characteristics. In the special case of plasticity theory for materials whose yield criterion does not depend on the average stress, two methods are used to construct an orthogonal net of characteristics and to determine the stress field: the R-S method and Mikhlin’s coordinate method. In the case of the Mohr-Coulomb yield condition, the angle between the characteristic directions depends on the internal friction angle. Therefore, the above-mentioned methods should be generalised in accordance with this property of characteristics. Purpose. In the case of Plasticity theory for materials whose yield strength does not depend on the average stress, to calculate the stress filed, Mikhlin’s coordinate method is widely used. The purpose of this study is to generalise this method for the equation system consisting of the Mohr-Coulomb yield criterion and the pressure equilibrium equations. Methods. The geometrical properties of the characteristics of the equations’ system consisting of the Mohr-Coulomb yield condition and the equilibrium equations are used to introduce the generalised Mikhlin coordinates. Results. It’s been pointed out that solving equation system consisting of the MohrCoulomb yield condition and equilibrium equation comes to solving equation of telegraphy and to subsequent integration. Practical Significance. The developed method of system of equations’ solution, consisting of the Mohr-Coulomb yield condition and equilibrium equation enables obtaining high precision solutions at insignificant computer time expenditures.
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15

Aleksandrov, A. S., G. V. Dolgih e A. L. Kalinin. "Criteria of Mora-Coulomb with Three Parameters of Material". Materials Science Forum 992 (maggio 2020): 863–69. http://dx.doi.org/10.4028/www.scientific.net/msf.992.863.

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A modified Mohr – Coulomb criterion is presented. This criterion, in addition to adhesion and the angle of internal friction, contains the third parameter of the material (d). Depending on the value of this parameter (d), the modified criterion can take the form of the original Mohr – Coulomb criterion (with d = 0.5) or the original Treska criterion (with d = 0). For all other values of the parameter (d), varying in the range of 0 <d <0.5, the tangential stresses by the modified criterion are larger than the Mohr – Coulomb criterion, but less than the Tresca criterion. The paper presents the methodology and results of determining this parameter (d) using experiments on the triaxial compression of soils. The technique contains recommendations for the appointment the value of the axial strain of the sample material when determining the value of the parameter d. The value of the ultimate deformation is advisable to take in the range from 8 to 12%. This range is due to the fact that with axial deformation of the sample of 8%, the formation of slip areas begins in it, and with axial deformation of the sample 12%, the slip area is completely formed. In this case, the parameter d varies in the range 0 <d <0.5, having a shear strength bigger than in the Tresca criterion, but less than in the original Mohr – Coulomb criterion. The tangential stresses according to the modified criterion, on the contrary, have a bigger value than according to the Mohr – Coulomb criterion, but the values of the tangential stresses are lower than in the Tresca criterion.
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16

Poklopová, Tereza, Veronika Pavelcová e Michal Šejnoha. "COMPARING THE HOEK-BROWN AND MOHR-COULOMB FAILURE CRITERIA IN FEM ANALYSIS". Acta Polytechnica CTU Proceedings 30 (22 aprile 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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17

Sun, Hai Jian, e Yong Quan Li. "Numerical Analysis of the Excavation of Deep Pit Based on Mohr-Coulomb Failure Model". Advanced Materials Research 919-921 (aprile 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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18

Barsanescu, Paul Doru, Ana Maria Comanici, Liviu Andrusca e Adriana Savin. "Modified Mohr-Coulomb Theory for Triaxial State of Stress". Applied Mechanics and Materials 809-810 (novembre 2015): 658–63. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.658.

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The Mohr-Coulomb failure theory presents the major drawback that can be applied only for plane state of stress. In this paper, we propose a modification of the Mohr-Coulomb theory that might eliminate this disadvantage. It is proposed to replace the three Mohr's circles for spatial state of stress with one “virtual circle” with diameter σ1-σ3±2ρ, concentric with the circle that has the diameter σ1-σ3. The triaxial state of stress and biaxial state of stress are considered to be equivalent dangerous.
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19

Lee, Choul-Kyu, Kang-Il Lee e Jae-Gi Kang. "An Assessment of Rock Pillar Stability in Tunnel Asymmetric Diverging Area using the Mohr-Coulomb Failure Theory". Journal of the Korean Geosynthetic Society 15, n. 4 (30 dicembre 2016): 17–23. http://dx.doi.org/10.12814/jkgss.2016.15.4.017.

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20

Christensen, Richard M. "A Comparative Evaluation of Three Isotropic, Two Property Failure Theories". Journal of Applied Mechanics 73, n. 5 (2 dicembre 2005): 852–59. http://dx.doi.org/10.1115/1.2173007.

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Three fundamentally different failure theories for homogeneous and isotropic materials are examined in both the ductile and brittle ranges of behavior. All three theories are calibrated by just two independent failure properties. These three are the Coulomb-Mohr form, the Drucker-Prager form, and a recently derived theory involving a quadratic representation along with a fracture restriction. The three theories are given a detailed comparison and evaluation. The Coulomb-Mohr form and the Drucker-Prager form are found to predict physically unrealistic behavior in some important cases. The present form meets the consistency requirements.
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21

Zeng, Feitao, Yuan Li e Joseph F. Labuz. "Paul-Mohr-Coulomb Failure Criterion for Geomaterials". Journal of Geotechnical and Geoenvironmental Engineering 144, n. 2 (febbraio 2018): 06017018. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0001829.

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22

Liang, Y., D. R. P. Hettiaratchi e J. R. O'callaghan. "MOHR-Coulomb parameters and soil indentation tests". Journal of Terramechanics 22, n. 3 (gennaio 1985): 173. http://dx.doi.org/10.1016/0022-4898(85)90077-1.

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23

Qiu, Wenge, Chao Kong e Kai Liu. "Three-Dimensional Numerical Analysis of the Tunnel for Polyaxial State of Stress". Mathematical Problems in Engineering 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/301241.

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The aim of this study is to have a comprehensive understanding of the mechanical behavior of rock masses around excavation under different value of intermediate principal stress. Numerical simulation was performed to investigate the influence of intermediate principal stress using a new polyaxial strength criterion which takes polyaxial state of stress into account. In order to equivalently substitute polyaxial failure criterion with Mohr-Coulomb failure criterion, a mathematical relationship was established between these two failure criteria. The influence of intermediate principal stress had been analyzed when Mohr-Coulomb strength criterion and polyaxial strength criterion were applied in the numerical simulation, respectively. Results indicate that intermediate principal stress has great influence on the mechanical behavior of rock masses; rock strength enhanced by intermediate principal stress is significant based on polyaxial strength criterion; the results of numerical simulation under Mohr-Coulomb failure criterion show that it does not exert a significant influence on rock strength. Results also indicate that when intermediate principal stress is relatively small, polyaxial strength criterion is not applicable.
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24

Ahmad Safi, Walid, e Yo Hibino. "Correlation between shear and normal strength for brittle reinforced concrete member considering internal stress condition of concrete". MATEC Web of Conferences 270 (2019): 01007. http://dx.doi.org/10.1051/matecconf/201927001007.

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Formulas used to predict shear strength of reinforced concrete in different standards do not always correspond to each other due to the complexity of the shear transfer mechanism. Currently there is no generally accepted method of shear strength pridiction, however, traditionally, shear strength anticipation of a structural concrete elements is performed differently on members with or without shear reinforcement. These empirical approches tend to predict the shear strength too conservatively; alternatively, shear strength of concrete can be easily predicted by Mohr-Coulomb theory. In case of high-axial load and low shear reinforcement, the strength is likely to be determined by the concrete's shear crack. Therefore, a method to predict the strength of concrete with Mohr-circle has been proposed but the circles crossed the boundary and could not evaluate the strength correctly. Mohr circle can be used for prediction of diagonal tension failure strength but the circle cannot be evaluated. In this paper, Mohr circles were investigated considering all steps of cyclic loading until shear crack occurred. It also investigates a correlation between shear strength and normal strength through recognition of the Mohr-Coulomb failure criteria for each specimen.
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25

Macijauskas, Darius, e Jonas Amšiejus. "Giliųjų pamatų modeliavimas taikant Mohr-Coulomb modelį tankiuose smėliuose, esant dilatacijai". Mokslas - Lietuvos ateitis 1, n. 5 (13 aprile 2011): 84–88. http://dx.doi.org/10.3846/mla.2009.5.16.

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Straipsnyje nagrinėjamas giliųjų pamatų (standžių gręžtinių ir gręžtinių polių) apkrovos pasiskirstymas tarp pamato pado ir šonų, kai jie yra tankiuose vienalyčiuose smėliuose. Naudojant programinį paketą Plakis 3D Foundation v2, modeliuojama keičiant dilatacijos kampą ir vertinamas Mohr-Coulomb modelio tinkamumas giliųjų pamatų pagrindams modeliuoti. Skirtinguose kampuose yra nevienodas apkrovos pasiskirstymas tarp pado ir šonų, taip pat, didėjant kampui, didėja ir šoninė trintis. Tačiau Mohr-Coulomb grunto modelyje drenuojant grunto tūris didėja tol, kol vyksta skersinės deformacijos. Realiems gruntams tai nėra būdinga, nes dėl tam tikrų įtempių dilatacija nebevyksta. Paklaida mažėja, kai mažėja santykinis giliojo pamato ilgis L/D ir dilatacijos kampas ψ.
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Neeamy, Aows Khalid, e Nada Sabah Selman. "Wellbore Breakouts Prediction from Different Rock Failure Criteria". Journal of Engineering 26, n. 3 (1 marzo 2020): 55–64. http://dx.doi.org/10.31026/j.eng.2020.03.05.

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One of the wellbore instability problems in vertical wells are breakouts in Zubair oilfield. Breakouts, if exceeds its critical limits will produce problems such as loss circulation which will add to the non-productive time (NPT) thus increasing loss in costs and in total revenues. In this paper, three of the available rock failure criteria (Mohr-Coulomb, Mogi-Coulomb and Modified-Lade) are used to study and predict the occurrence of the breakouts. It is found that there is an increase over the allowable breakout limit in breakout width in Tanuma shaly formation and it was predicted using Mohr-Coulomb criterion. An increase in the pore pressure was predicted in Tanuma shaly formation, thus; a new mud weight and casing programs are proposed to overcome such problems in the drilling operations in field developments plans.
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27

Pauli, Alexander, Michael A. Kraus e Geralt Siebert. "Experimental and numerical investigations on glass fragments: shear-frame testing and calibration of Mohr–Coulomb plasticity model". Glass Structures & Engineering 6, n. 1 (22 febbraio 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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Sugawara, J., Z. Q. Yue, L. G. Tham, K. T. Law e C. F. Lee. "Weathered rock characterization using drilling parameters". Canadian Geotechnical Journal 40, n. 3 (1 giugno 2003): 661–68. http://dx.doi.org/10.1139/t03-007.

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The characterization of weathered rocks by the use of drilling parameters is presented. Drilling parameters obtained from the drilling process monitoring system during the installation of soil nails into weathered rocks are used in this investigation. A new drilling index Pi, simplified from the concept of the specific energy, is used in an attempt to differentiate weathered rocks. With Pi or the penetration rate, boundaries of weathered rocks between (1) soil and rock ranges, and (2) grade II and grade III rocks in accordance with the six-fold rock material decomposition grade are identified. For weathered rocks in the soil range, quantitative characterization has been established in this study by using the drilling parameters. An empirical equation has been established for estimating the standard penetration resistance N value from the drilling parameter Pi, which is used in turn to determine the Mohr–Coulomb friction angle based on the work of Schmertmann. Although this approach tends to yield a slightly larger Mohr–Coulomb friction angle than that from laboratory tests, results obtained in this attempt reveal that estimation of the Mohr–Coulomb friction angle from drilling parameters is attainable with reasonable accuracy.Key words : drilling, standard penetration, percussion index, penetration rate.
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29

Djebbar, R., S. B. Beale e M. Sayed. "Numerical Study of Two-Phase Granular Flow for Process Equipment". Journal of Pressure Vessel Technology 122, n. 4 (1 febbraio 2000): 462–68. http://dx.doi.org/10.1115/1.1310366.

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This paper reports on a research program of modeling multi-phase granular flow. Both single-phase granular flow and two-phase liquid/granular flow in a pressure vessel were considered. For the latter case, detailed results based on a viscous/Mohr-Coulomb closure were compared to existing formulations. Idealized test cases indicated that the numerical procedure is sound. Subsequent simulations of two-phase flow using realistic geometries and boundary conditions showed that the pressure distribution in the solid phase is fundamentally different for the Mohr-Coulomb system than for the conventional system. The effect of the angle of internal friction, geometry, and other parameters is discussed. [S0094-9930(00)01204-X]
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Keppler, István. "Szemcsés halmazok mohr-coulomb féle nyírási tönkremenetelének elemzése". Fiatal Műszakiak Tudományos Ülésszaka 1. (2006) (2006): 177–80. http://dx.doi.org/10.36243/fmtu-2006.44.

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CONSOLI, N. C., L. DA SILVA LOPES JR, B. S. CONSOLI e L. FESTUGATO. "Mohr–Coulomb failure envelopes of lime-treated soils". Géotechnique 64, n. 2 (febbraio 2014): 165–70. http://dx.doi.org/10.1680/geot.12.p.168.

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CONSOLI, N. C., E. FRATALOCCHI, B. S. CONSOLI, F. MAZZIERI, M. DI SANTE, L. FESTUGATO e L. DA SILVA LOPES JR. "Mohr–Coulomb failure envelopes of lime-treated soils". Géotechnique 65, n. 10 (1 ottobre 2015): 866–68. http://dx.doi.org/10.1680/geot.15.d.001.

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Consoli, N. C., L. Da Silva Lopes JR, B. S. Consoli, L. Festugato, M. Di Sante, E. Fratalocchi e F. Mazzieri. "Mohr–Coulomb failure envelopes of lime-treated soils". Géotechnique 65, n. 10 (ottobre 2015): 866–68. http://dx.doi.org/10.1680/jgeot.15.d.001.

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34

Griffiths, D. V. "Failure Criteria Interpretation Based on Mohr‐Coulomb Friction". Journal of Geotechnical Engineering 116, n. 6 (giugno 1990): 986–99. http://dx.doi.org/10.1061/(asce)0733-9410(1990)116:6(986).

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35

Galic, Mirela, Pavao Marovic e Zeljana Nikolic. "Modified Mohr‐Coulomb – Rankine material model for concrete". Engineering Computations 28, n. 7 (11 ottobre 2011): 853–87. http://dx.doi.org/10.1108/02644401111165112.

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36

WANG, Hong-Cai, Wei-Hua ZHAO, Dong-Sheng SUN e Bin-Bin GUO. "Mohr-Coulomb Yield Criterion in Rock Plastic Mechanics". Chinese Journal of Geophysics 55, n. 6 (novembre 2012): 733–41. http://dx.doi.org/10.1002/cjg2.1767.

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37

Wei, Kaihong, e Jean-Claude De Bremaecker. "A replacement for the Coulomb-Mohr Fracture Criterion". Geophysical Research Letters 19, n. 10 (22 maggio 1992): 1033–36. http://dx.doi.org/10.1029/92gl00973.

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38

Crisfield, M. A. "Plasticity computations using the Mohr—Coulomb yield criterion". Engineering Computations 4, n. 4 (aprile 1987): 300–308. http://dx.doi.org/10.1108/eb023708.

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39

Coombs, W. M., R. S. Crouch e C. E. Heaney. "Observations on Mohr-Coulomb Plasticity under Plane Strain". Journal of Engineering Mechanics 139, n. 9 (settembre 2013): 1218–28. http://dx.doi.org/10.1061/(asce)em.1943-7889.0000568.

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40

Barsanescu, P. "Extension of Mohr-Coulomb Theory for Ductile Materials". Experimental Mechanics 55, n. 7 (25 aprile 2015): 1389–93. http://dx.doi.org/10.1007/s11340-015-0026-0.

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41

Lechner, Philipp, Jens Stahl, Christoph Hartmann, Florian Ettemeyer e Wolfram Volk. "Mohr–Coulomb characterisation of inorganically-bound core materials". Journal of Materials Processing Technology 296 (ottobre 2021): 117214. http://dx.doi.org/10.1016/j.jmatprotec.2021.117214.

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42

Cui, X. Z., Q. Jin, Q. S. Shang e S. T. Liu. "Mohr-Coulomb Model Considering Variation of Elastic Modulus and Its Application". Key Engineering Materials 306-308 (marzo 2006): 1445–48. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.1445.

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Abstract (sommario):
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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43

Ahmadi, M. M., P. M. Byrne e R. G. Campanella. "Cone tip resistance in sand: modeling, verification, and applications". Canadian Geotechnical Journal 42, n. 4 (1 agosto 2005): 977–93. http://dx.doi.org/10.1139/t05-030.

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A numerical modeling procedure is presented to evaluate cone tip resistance in sand. The procedure involves a moving boundary simulating cone penetration. The soil is modeled as a Mohr–Coulomb elastic–plastic material with stress-dependent parameters. The procedure is verified by comparing predicted numerical values of cone tip resistance with published experimental measurements from calibration chamber tests. The selected database consists of 59 calibration chamber tests on Ticino sand with different relative densities, overconsolidation ratios, stresses, and boundary conditions. Several applications of the modeling procedure are also presented. The computer program FLAC is used to carry out the analysis.Key words: cone tip resistance, numerical modeling, sand, calibration chamber, Mohr-Coulomb, in situ horizontal stress.
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44

Wongchana, Pongsakorn, e Peerapong Jitsangiam. "Experimental Investigation and Modelling of Claystone from Mae Moh Coal Mine, Thailand". Key Engineering Materials 841 (maggio 2020): 155–60. http://dx.doi.org/10.4028/www.scientific.net/kem.841.155.

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Abstract (sommario):
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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45

GHORBANI, Ali, e Hadi HASANZADEHSHOOIILI. "A novel solution for ground reaction curve of tunnels in elastoplastic strain softening rock masses". JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 23, n. 6 (3 aprile 2017): 773–86. http://dx.doi.org/10.3846/13923730.2016.1271010.

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Abstract (sommario):
Ground Reaction Curve (GRC) is one of the most important elements of convergence-confinement method generally used to design tunnels. Realistic presentation of GRC is usually assessed based on the advanced rock strength criteria, also, rock mass behavior (including plasticity and softening treatments). Since taking these parameters into ac­count is not simply possible for practitioners and needs complicated coupled theoretical-numerical solutions, this paper presents a simple novel approach based on Evolutionary Polynomial Regression to determine GRC of rock masses obeying both Mohr-Coulomb and Hoek-Brown criteria and strain softening behaviors. The proposed models accurately present support pressures based on radial displacement, rock mass strength and softening parameter (determination coefficient of 97.98% and 94.2% respectively for Mohr-Coulomb and Hoek-Brown strain softening materials). The ac­curacy of the proposed equations are approved through comparing the EPR developed GRCs with the ground reaction curves available in the literature. Besides, the sensitivity analysis is carried out and in-situ stress, residual Hoek-Brown’s m constant and residual dilation angle are introduced as parameters with the most influence on the support pressure in Hoek-Brown and peak and residual geological strength index are the most affective parameters on the support pressure of tunnels in the strain softening Mohr-Coulomb rock mass.
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46

Elgridly, Essam, Ayman Fayed e Ali Abdel-Fattah. "BEHAVIOR OF PILE GROUPS UNDER LATERAL LOADS IN SAND SOIL CONSIDERING MOHR-COULOMB AND MODIFIED MOHR-COULOMB CRITERIONS: COMPARATIVE ANALYSIS". Journal of Al-Azhar University Engineering Sector 16, n. 60 (1 luglio 2021): 505–13. http://dx.doi.org/10.21608/auej.2021.187904.

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47

Han, Feng Shan. "Estimation of Strength of Massive Jointed Rock Mass Based on Generalized Hoek-Brown Criterion". Applied Mechanics and Materials 204-208 (ottobre 2012): 259–62. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.259.

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Abstract (sommario):
The strength of massive jointed rock mass can be estimated based on Mohr-Coulomb criterion and Hoek-Brown criterion without making expensive experiment of massive jointed rock mass in site. Only using regression analysis, through transformation，Mohr-Coulomb criterion is compared with Hoek-Brown criterion, the strength of jointed rock mass can be economically obtained. In this paper, based on Geological Strength Index GSI and parameter Jv(Joint/m3), the strength of massive jointed rock mass can be obtained. As an example of GSI 24 for massive jointed rock mass is taken, generalized Hoek-Brown criterion is analyzed linearly and approximately using regression analysis, strength of jointed rock mass can be economically obtained That provide economical and effective method for practical engineering analysis
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48

Wang, Xing Chen, Ri Qing Xu e Jian Feng Zhu. "Experimental Study on Shear Strength Considering Initial Void Ratio and Plasticity Index". Applied Mechanics and Materials 405-408 (settembre 2013): 63–67. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.63.

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Abstract (sommario):
A series of drained triaxial compression tests under different conditions were performed to quantitatively study the influence of the initial void ratio and plasticity index on the shear strength of remolded saturated clays. The test results show that both the peak stress friction angle and peak deviatoric stress decrease with increasing initial void ratio and plasticity index of the soil under the same confining pressure; whereas, they increase with increasing confining pressure of the soil under the same initial void ratio and plasticity index. A new synthesized physical parameter λ, which simultaneously represent both the type and the condition of remolded saturated clays, is defined based on the test results in this work. The functional relationships among the parameters φd and peak deviatoric stress in Mohr-Coulomb equation and the parameter λ are established to develop a modified Mohr-Coulomb equation by considering physical properties of soil. In this equation, only two input parameters, i.e., λ and the confine pressure, are needed to predict the shear strength of the soil. In order to check the accuracy of the proposed equation, laboratory tests were conducted to evaluate against the predicted results. The results show that the peak shear strength of remolded saturated clays can be well described by the proposed equation. Key words: shear strength; Mohr-Coulomb equation; remolded saturated clays; initial void ratio; plasticity index.
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49

Rivanga, Nadya Utami, e Indra Noer Hamdhan. "Analisis Vacuum Consolidation pada Perbaikan Tanah Lempung Lunak dengan Model Axisymmetric (Hal. 68-79)". RekaRacana: Jurnal Teknil Sipil 4, n. 1 (27 febbraio 2018): 68. http://dx.doi.org/10.26760/rekaracana.v4i1.68.

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Abstract (sommario):
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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50

Dearini J, R. Thasyia Puteri, e Indra Noer Hamdhan. "Analisis Daya Dukung Lateral pada Suction Pile dengan Menggunakan Metode Numerik. (Hal. 96-106)". RekaRacana: Jurnal Teknil Sipil 5, n. 2 (25 settembre 2019): 96. http://dx.doi.org/10.26760/rekaracana.v5i2.95.

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Abstract (sommario):
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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