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Journal articles on the topic 'Stages of compaction modes'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Shen, Pei Hui. "Hysteresis Modeling and Analysis for Dynamic Compaction." Advanced Materials Research 1037 (October 2014): 53–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1037.53.

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The soil compactor is one of the most important construction machineries which play an significant role during our economic development. And the complicated nonlinear characteristic of equipment-material system is an interesting field in recent theoretical and applied investigations. According to experimental datum, a nonlinear model derived from piecewise linear was used to describe the hysteretic behavior of soil material during compaction. Through choosing proper model parameters, the nonlinear dynamic characteristics are commendably controlled which could represent different compacting sta

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Stefanov, Y. P., and D. K. Zharasbaeva. "Loading diagrams and parameters of the model of elastic-pseudoplastic deformation of black shale rocks of the Bazhenov formation." Russian Journal of Geophysical Technologies, no. 3 (March 15, 2023): 13–24. http://dx.doi.org/10.18303/2619-1563-2022-3-13.

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The results of the analysis of experimental data on pseudotriaxial loading of full-size samples of black shale rocks of the Bazhenov Formation are presented. The experiments were carried out under conditions of uniaxial loading and at lateral compression pressures of 20 and 40 MPa. It is shown that in the considered load range, the deformation of the rock beyond the elastic limit proceeds in different modes: dilatancy and compaction. Despite the low porosity of the rock, the transition from dilatation to compaction occurs at a pressure not exceeding 34 MPa. Based on the analysis of the obtaine

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3

ANOUAR, BENABBES, SIAD LARBI, DORMIEUX LUC, and WING KAM LIU. "YIELD DESIGN HOMOGENIZATION METHOD FOR COMPACTION OF MONOSIZED SPHERICAL POWDERS." International Journal of Applied Mechanics 02, no. 03 (2010): 457–88. http://dx.doi.org/10.1142/s1758825110000615.

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The compaction of a package of monosized spherical solid grains by rate-independent plasticity deformation is examined in this paper through the use of both yield design homogenization method and finite element simulation. Both modes of compaction, isostatic and closed die, are considered. In this study, the arrangement of powder consists of hexagonal array of identical spherical grains touching each other in its initial state. During the compaction process the response of the powder compacts is monitored in terms of behaviors of appropriate representative unit cells subject to axisymmetrical

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4

Yu, Huanan, Yutang Gao, Guoping Qian, et al. "Study on synergistic effect of multiple physical fields on hot mix asphalt during compaction process." Mathematical Biosciences and Engineering 21, no. 4 (2024): 5181–206. http://dx.doi.org/10.3934/mbe.2024229.

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<abstract> <p>The multiple physical fields of hot mix asphalt (HMA) during the compaction process have a significant impact on the durability of asphalt pavement, and this research aimed to evaluate the synergistic effect of the HMA field compaction of multi-physical field evolution during the compaction process. First, the temperature field, structural layer thickness variation, and structural layer density variation were monitored during field compaction. Second, the evolution properties of compaction thickness were obtained under the synergistic influence of multi-physical field

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Ionel Laurenţiu, Alboteanu, Drighiciu Mircea Adrian, Drighiciu Ecaterina Maria, and Ravigan Florin. "Pneumatic System for Compacting Food Waste Packaging." Annals of the University of Craiova Electrical Engineering Series 48 (January 23, 2025): 61–68. https://doi.org/10.52846/aucee.2024.09.

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The paper presents an automatic system for compacting metal, plastic and glass waste from food consumption (boxes or empty cans). The compaction process is found in waste recycling systems. The purpose of this work is to analyze the main stages of designing an electro-pneumatic drive and automation system for a waste compactor used in food packaging, starting with the creation of the specifications document and ending with the development of a control structure in a classic version – control circuits with contacts and relays, or by using programmable logic controllers (PLCs). To design and val

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Shishkin, E. A. "Rheological model parameters determination based on laboratory studies." Nauchno-tekhnicheskiy vestnik Bryanskogo gosudarstvennogo universiteta 10, no. 2 (2024): 133–39. http://dx.doi.org/10.22281/2413-9920-2024-10-02-133-139.

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Different types of models are used to study the stress-strain behavior of asphalt concrete mixture during compaction. For modeling it is necessary to know the values of model parameters in the whole range of changes in the characteristics of the compacted material. The aim of the paper is to develop a methodology for determining model parameters based on the results of laboratory creep-recovery testing of asphalt-concrete mixture. In the paper, a model reflecting elastic, visco-elastic and visco-fluid properties of the compacted material is adopted. A differential equation representing the law

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Khudyakov, A. Yu, and S. V. Vashchenko. "Analysis of known dependencies and development of new compaction equations for fine materials of the mining&metallurgical complex." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 12 (January 23, 2020): 37–46. http://dx.doi.org/10.17073/1683-4518-2019-12-37-46.

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The analysis of the empirical compaction equations has been carried, the advantages, disadvantages and limitations that restricts the scope of their application by modeling individual stages of the process and selected groups of materials are shown. It has been established that the pressing equation of the ISI is the only dependence successfully used for small sized materials of the mining and metallurgical complex, the necessity of its improvement is substantiated. The requirements for compaction equations have been formulated. Two compaction equations have been developed, the combined use of

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8

Yenilmez, Bekir, Baris Caglar, and E. Murat Sozer. "Viscoelastic modeling of fiber preform compaction in vacuum infusion process." Journal of Composite Materials 51, no. 30 (2017): 4189–203. http://dx.doi.org/10.1177/0021998317699983.

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A woven fabric’s compaction was modeled by using five viscoelastic models – Maxwell, Kelvin-Voigt, Zener, Burgers, and Generalized Maxwell – to reveal the capabilities and limitations of the models. The model parameters were optimized by minimizing the deviation between the model results and experimental data collected in our previous material characterization study mimicking different compaction stages (loading, fiber settling, wetting, unloading, and fiber relaxation) that a fiber structure undergoes during vacuum infusion process. Although Burgers and Generalized Maxwell models have the hig

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9

Wang, Sheng, Kaizhou Xu, Wanchun Zhao, Xiaofei Fu, Xuesong Lu, and Zhenlong Song. "A New Model to Predict Mudstone Failure Behavior from Brittle to Ductile Caused by Confining Pressures." Processes 13, no. 2 (2025): 308. https://doi.org/10.3390/pr13020308.

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Understanding the failure behavior and mechanisms of mudstone is very important for engineering applications. While confining pressures play an important role in mudstone deformation, the limitations of laboratory conditions and mudstone sample preparation preclude scaled models of the mechanisms of deformation transition from brittle to ductile, especially for high confining pressures. In this study, dry indurated mudstone of the Kuqa depression in North China acted as the prototype rock for a numerical model. We performed numerical experiments for different confining pressures. Overall, the

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Ivan, Nazarenko, and Slipetskyi Volodymyr. "ANALYSIS AND SYNTHESIS OF CREATION OF VIBRATION MACHINES WITH AN ESTIMATION OF THEIR EFFICIENCY AND RELIABILITY." Technology audit and production reserves 6, no. 1 (50) (2019): 29–31. https://doi.org/10.15587/2312-8372.2019.189057.

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<em>The analysis of processes occurring in the medium under the influence of vibrational forces is considered. The obtained results are synthesized for the development of a new class of vibration machines that provide criteria for efficiency and reliability. The main criterion for evaluating the effectiveness is adopted function of the amplitude and frequency of vibrations, which determines the speed or acceleration of the compaction process. At the same time, the logic of the stage-by-stage examination of the compaction process is proved. The first of them – the process of reconnecting

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Ivan, Nazarenko, Luhovskyi Oleksandr, Bernyk Iryna, and Svіdersky Anatoly. "RESEARCH OF THE INFLUENCE OF LOW-FREQUENCY AND HIGH-FREQUENCY ACTIONS ON PROCESSING OF TECHNOLOGICAL ENVIRONMENTS." EUREKA: Physics and Engineering, no. 1 (January 31, 2018): 73–86. https://doi.org/10.21303/2461-4262.2018.00566.

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The processing of various vibrational low-frequency and cavitation high-frequency actions by their rheological properties is studied. A mathematical model of the motion of particles of a technological environment is determined taking into account the different nature of the dissipative forces. Two kinds of frictional forces are applied: dry at the first stage of changing the constituents of the mixture and viscous at the second, final stage of compaction of the mixture. The obtained analytical dependencies reveal the physical picture of the behavior of particles and the technological environme

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Wei, Kai, Yanke Wang, and Xujing Yang. "Viscoelastic Modeling of Responses in the Whole Compaction Process for Woven Fiber Reinforcements." International Journal of Applied Mechanics 10, no. 02 (2018): 1850019. http://dx.doi.org/10.1142/s1758825118500199.

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Compaction and the corresponding viscoelastic behaviors of woven fiber reinforcements are essential to determine the mechanical properties of composite components. Current reported works separately studied the viscoelastic behaviors in partial stage of the compaction process. In contrast, here, we propose a uniform viscoelastic model that can describe the viscoelastic responses in all stages. Systematical experiments of carbon and glass woven fiber reinforcements demonstrate the effectiveness of this viscoelastic model. Moreover, the significances of the model parameters and their underlying r

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Nazarenko, Ivan, Oleksandr Luhovskyi, Iryna Bernyk, and Anatoly Svіdersky. "RESEARCH OF THE INFLUENCE OF LOW-FREQUENCY AND HIGH-FREQUENCY ACTIONS ON PROCESSING OF TECHNOLOGICAL ENVIRONMENTS." EUREKA: Physics and Engineering 1 (January 31, 2018): 73–86. http://dx.doi.org/10.21303/2461-4262.2018.00566.

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The processing of various vibrational low-frequency and cavitation high-frequency actions by their rheological properties is studied. A mathematical model of the motion of particles of a technological environment is determined taking into account the different nature of the dissipative forces. Two kinds of frictional forces are applied: dry at the first stage of changing the constituents of the mixture and viscous at the second, final stage of compaction of the mixture. The obtained analytical dependencies reveal the physical picture of the behavior of particles and the technological environme

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14

Meyer, Colin R., Kaitlin M. Keegan, Ian Baker, and Robert L. Hawley. "A model for French-press experiments of dry snow compaction." Cryosphere 14, no. 5 (2020): 1449–58. http://dx.doi.org/10.5194/tc-14-1449-2020.

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Abstract. Snow densification stores water in alpine regions and transforms snow into ice on the surface of glaciers. Despite its importance in determining snow-water equivalent and glacier-induced sea level rise, we still lack a complete understanding of the physical mechanisms underlying snow compaction. In essence, compaction is a rheological process, where the rheology evolves with depth due to variation in temperature, pressure, humidity, and meltwater. The rheology of snow compaction can be determined in a few ways, for example, through empirical investigations (e.g., Herron and Langway,

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15

Butko, Denis A. "Theoretical aspects of sludge treatment schemes." Urban construction and architecture 13, no. 4 (2024): 4–10. http://dx.doi.org/10.17673/vestnik.2023.04.01.

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Сonsiders the stages of the life cycle of waste water from sedimentation tanks and facilities for processing wash water from fast filters: formation, compaction, dehydration and disposal. A processing model has been formed and the influencing factors on the concentration of suspended solids in each of the stages have been established. Based on the theories of sediment movement, the theory of sediment compaction prof. E.F. Kurgaev and the theory of drying acad. A.V. Lykov proposed a mathematical description of the sludge treatment scheme. The obtained results are confirmed by the choice of infl

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Halder, Dipanjan, and Pradipta Purkayastha. "Impact of cationic surfactant-induced DNA compaction on the characteristics of a minor groove bound flavonol." Soft Matter 18, no. 5 (2022): 938–42. http://dx.doi.org/10.1039/d1sm01792f.

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Liu, De-Hang, Yue Qin, Li Zhuo, et al. "Compaction Behavior and Damage Constitutive Model for Porous Cement Mortar under Uniaxial Cyclic Loads." Materials 15, no. 23 (2022): 8302. http://dx.doi.org/10.3390/ma15238302.

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The void compression stage causes porous cement mortar to present special mechanical properties. In order to study the compaction behavior and the damage evolution of the porous material, cement mortar specimens with an average porosity of 26.8% were created and cyclic uniaxial compression tests were carried out. The irreversible strain accumulated in the tests was obtained by cyclic loading and unloading. As the secant modulus of the porous cement mortar increases with stress in the pre-peak deformation stage, its damage variable is defined according to the accumulated irreversible strain ins

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18

Wang, Huanling, Weiya Xu, Zaobao Lui, Zhiming Chao, and Qingxiang Meng. "Dependency of hydromechanical properties of monzonitic granite on confining pressure and fluid pressure under compression." International Journal of Modern Physics B 30, no. 16 (2016): 1650086. http://dx.doi.org/10.1142/s0217979216500867.

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Monzonitic granite is a low-permeability rock. Monzonitic granite formations are ideal for underground storage of oil due to their low permeability and high mechanical strength. In this study, a series of coupled hydromechanical triaxial tests are carried out using monzonitic granite specimens. The influence of confining and fluid pressures on stress, strain, and permeability is investigated. Failure characteristics under different confining and fluid pressures are discussed based on the analysis of macro fracture planes and micro scanning electron microscopy (SEM). The test results show that

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Yang, Xiao-Guang, and Shao-Bin Guo. "Porosity model and pore evolution of transitional shales: an example from the Southern North China Basin." Petroleum Science 17, no. 6 (2020): 1512–26. http://dx.doi.org/10.1007/s12182-020-00481-7.

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AbstractThe evolution of shale reservoirs is mainly related to two functions: mechanical compaction controlled by ground stress and chemical compaction controlled by thermal effect. Thermal simulation experiments were conducted to simulate the chemical compaction of marine-continental transitional shale, and X-ray diffraction (XRD), CO2 adsorption, N2 adsorption and high-pressure mercury injection (MIP) were then used to characterize shale diagenesis and porosity. Moreover, simulations of mechanical compaction adhering to mathematical models were performed, and a shale compaction model was pro

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Wang, Nian Qin, Qing Tao Wang, Qian Xue, and Xiao Ling Liu. "Experimental Study of Static Disintegration on Unsaturated Soil." Applied Mechanics and Materials 580-583 (July 2014): 68–72. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.68.

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In order to explore the disintegration characteristics of compacted loess, through the unsaturated soil disintegration instrument by independently developed,conduct the soaking disintegration experimental study on remolded soil unsaturated samples,obtained a series of experimental results:①The curves can be divided into the slow disintegration, rapid disintegration and stabilization of disintegration in three stages，the degree of compaction and water rate impact on rapidly disintegrating stage;②When the degree of compaction is certain,the disintegration rate decreased with the water contented

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Wang, Xuesong, Hua Cheng, Zhishu Yao, Chuanxin Rong, Xianwen Huang, and Longhui Guo. "Theoretical Research on Grouting in Deep Loose Layers Based on the Cylindrical Diffusion Model of Radial Tube Flow." Geofluids 2022 (March 25, 2022): 1–12. http://dx.doi.org/10.1155/2022/1302260.

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Grouting in deep, loose layers are a complex process in which many modes such as infiltration, splitting, and compaction coexist. It is of great significance to establish a realistic, simplified physical model to study the law of slurry diffusion. Herein, a cylindrical diffusion model of radial tube flow is established, and the control differential equations of both the Bingham slurry diffusion velocity in a single tube and the diffusion velocity of the radial tube flow are deduced. Additionally, the calculation formulas for the diffusion radius and slurry pressure distribution function are ob

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Katarov, V. K., N. V. Aleshina, V. S. Syunev, E. I. Rat’kova, and V. I. Markov. "Assessment of soil compacted state in forest road costruction." Forestry Bulletin 6, no. 6 (2021): 106–17. http://dx.doi.org/10.18698/2542-1468-2021-6-106-117.

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The issue of soil compacted state forecasting during the construction of a forest road is considered. The mechanical system formation of contacting particles of the compacted soil are given and substantiated. A model of compaction of a loose soil layer in the system "compaction device - compacted material" has been developed. A new compartment approach in this field of applied research was used, within which the system under study is subdivided into interconnected units, called compartments, the content of a certain substance in each of them is a separate variable of the system. Various techno

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Li, Jian, Dayang Xuan, Jialin Xu, Zebin Dong, and Chaochao Wang. "Compaction Response of Mining-Induced Rock Masses to Longwall Overburden Isolated Grouting." Minerals 13, no. 5 (2023): 633. http://dx.doi.org/10.3390/min13050633.

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Surface subsidence in coal mine areas can cause serious geological hazards. After a coal seam is mined, the overlying rock layers fracture, collapse, and expand; the fractured and bulking rock masses are then continuously compacted under the action of overburden load, which eventually leads to surface subsidence. Overburden isolated grout filling via surface boreholes, and high-pressure grouting to mining-induced fissures under the hard rock layer, uses the grouting pressure to compact the lower fractured and bulking rock masses in advance, replacing the subsidence void and effectively control

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Othman, A., A. A. Arifin, S. Abdullah, A. K. Ariffin, and N. A. N. Mohamed. "Analysis of Crushing Laminated Composite Square Tubes under Quasi-Static Loading." Applied Mechanics and Materials 446-447 (November 2013): 113–16. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.113.

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This paper present on discusses the effect of crashworthiness parameters on pultrusion and hybrid laminated composite square tubes via experimentally. The wall-thicknesses of 2.1 for pultrusion and 1.6 mm aluminum wrap 1 layered were examined at the material fiber type of E-glass reinforced polyester resin of square cross-section subjected to axial quasi-static loading. Comparison has been made for both of type of composite material. During experimental observation, some of crushing modes on stages were identified as initial peak load stage, progressive crushing stage and compaction zone stage

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Yenilmez, Bekir, Talha Akyol, Baris Caglar, and E. Murat Sozer. "Minimizing Thickness Variation in the Vacuum Infusion (VI) Process." Advanced Composites Letters 20, no. 6 (2011): 096369351102000. http://dx.doi.org/10.1177/096369351102000603.

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In the Vacuum Infusion (VI) process, the thickness of a composite part changes as the compaction pressure on the vacuum bag and reinforcing fibre preform changes. Pressure and thickness were monitored along a 1D resin flow using pressure transducers and non-contact laser displacement sensors. To decrease the thickness variation, control actions were taken by adjusting the injection conditions, such as opening/closing gates/vents, changing pressure of them in the post-mold filling stage and bleeding out the excess resin. The control actions were taken based on an available compaction/decompacti

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Friedenberg, Larissa, Jeroen Bartol, James Bean, et al. "Compaction of crushed salt for safe containment – a summary of the KOMPASS projects." Safety of Nuclear Waste Disposal 2 (September 6, 2023): 109–11. http://dx.doi.org/10.5194/sand-2-109-2023.

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Abstract. For the underground disposal of high-level nuclear waste in rock salt formations, the safety concept includes the backfilling of open cavities with crushed salt. For the prognosis of the sealing function of the backfill for the safe containment of the radioactive waste, it is crucial to have a comprehensive process understanding of the crushed-salt compaction behavior. The crushed-salt compaction process is influenced by internal properties (e.g., grain size, mineralogy, and moisture content) and boundary conditions (e.g., temperature, stress state, and compaction rate) and, therefor

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Ismail, A. S., Z. Nie, A. Ahmad, and S. Ali. "Investigating the influence of excitation force on compaction behavior of gravel in granular blends through DEM simulation." IOP Conference Series: Earth and Environmental Science 1332, no. 1 (2024): 012021. http://dx.doi.org/10.1088/1755-1315/1332/1/012021.

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Abstract During the construction of subgrades, the compaction of granular blends is typically achieved through vibrational techniques at varying the frequencies and excitation forces. This study investigates the impact of excitation forces, within the range of 300-600 kPa, on subgrade compaction by employing the discrete element method (DEM). Calibration tests were conducted to establish the contact parameters for the DEM models, and their reliability was verified via vibration compaction tests. The research further explores the evolution of settlement, particle motion, and contact interaction

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Zhang, Duzhou, Zhiguo Tian, Zhiqiang Chen, et al. "Compaction effects on permeability of spherical packing." Engineering Computations 37, no. 9 (2020): 3079–96. http://dx.doi.org/10.1108/ec-01-2020-0015.

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Purpose The purpose of this paper is to investigate the evolution of the permeability of spherical packing during cold compaction by pore-scale modeling. Design/methodology/approach The discrete element method (DEM) is used to generate spherical packing structure under different compressive pressures and the Lattice Boltzmann method (LBM) is adopted to calculate the permeability of each spherical assembly. Findings It is found that the decrease of the porosity is the main reason of the reduction in permeability in the initial compression stage, but its influence becomes insufficient in the lat

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Mante, Afua Adobea, Emeka Leonard Ndulue, Ramanathan Sri Ranjan, Francis Zvomuya, and Krishna Kaja. "Subsurface Drainage for Minimizing the Risk of Subsoil Compaction in Seasonally-Frozen Soils." Applied Engineering in Agriculture 38, no. 3 (2022): 589–97. http://dx.doi.org/10.13031/aea.14598.

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HighlightsSubsoil is highly susceptible to compaction based on texture and packing density.Imperfect natural drainage increases the risk of subsoil vulnerability to compaction.Irrespective of drain spacing, the risk for subsoil compaction was high.The upper soil layer protects the subsoil from compaction at drain spacing = 12 m in this soil. Abstract. Subsoil compaction negatively impacts soil hydrological processes and promotes anaerobic conditions, reducing soil productivity and enhancing greenhouse gas emissions from the soil. Additionally, it is challenging and expensive to alleviate subso

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Ge, Yongxiang, Gaofeng Ren, Congrui Zhang, Yihu Shi, and Luwei Zhang. "Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load." Materials 16, no. 10 (2023): 3711. http://dx.doi.org/10.3390/ma16103711.

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The objective of this work was to investigate the damage characteristics and failure modes of gypsum rock under dynamic impact loading. Split Hopkinson pressure bar (SHPB) tests were performed under different strain rates. The strain rate effects on the dynamic peak strength, dynamic elastic modulus, energy density, and crushing size of gypsum rock were analyzed. A numerical model of the SHPB was established using the finite element software, ANSYS 19.0, and its reliability was verified by comparing it to laboratory test results. The results showed that the dynamic peak strength and energy con

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Wessling, Stefan, Anne Bartetzko, and Philipp Tesch. "Quantification of uncertainty in a multistage/multiparameter modeling workflow: Pore pressure from geophysical well logs." GEOPHYSICS 78, no. 3 (2013): WB101—WB112. http://dx.doi.org/10.1190/geo2012-0402.1.

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Calculating subsurface pressures and predicting overpressured zones, in particular for safe drilling operations, is an integrated approach based on data and assumptions from various sources. Uncertainties arise from the input data and assumptions, but also from the pore-pressure modeling workflow including shale discrimination and the definition of a normal compaction trend line. These stages are usually performed manually by an expert and are prone to subjective, human interpretation. The quantification of pore-pressure uncertainty associated with the manual modeling stages is, therefore, cha

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Zemke, Kornelia, Kristoff Svensson, Ben Laurich, and Johanna Lippmann-Pipke. "Over 30 years of research on crushed salt as a barrier material: fundamental findings and open questions." Safety of Nuclear Waste Disposal 1 (November 10, 2021): 137–39. http://dx.doi.org/10.5194/sand-1-137-2021.

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Abstract. Repositories for high-level radioactive waste in geological formations require knowledge on thermal, mechanical and fluid transport properties of the whole repository system, including the engineered barriers and backfill materials. For about 30 years, crushed salt has been considered the most suitable geotechnical barrier material to backfill cavities and encapsulate radioactive waste in rock salt repository sites (e.g., Czaikowski et al., 2020). Over time, when the surrounding cavity walls converge by the creep of salt, it can become strongly compacted and safely encapsulates radio

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Prykhodko, I. Yu, M. O. Dedik, Stefan Brandt, K. O. Gogaev, A. I. Itsenko, and V. S. Voropaev. "Comprehensive finite-element study of processes for the production of titanium strips by asymmetric cold rolling of a powder followed by sintering." Fundamental and applied problems of ferrous metallurgy, no. 33 (2019): 173–92. http://dx.doi.org/10.52150/2522-9117-2019-33-173-192.

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Finite-element numerical modeling was implemented and a study of the production processes of thin titanium strips was carried out on the basis of two key sequential processes: asymmetric powder rolling and sintering of the rolled product using the Brand-Nielson model. The results of studying the processes of compaction and sintering of titanium powder using a single mathematical model proposed by Jan Brandt are presented. For the calculations we used experimentally determined shear stresses and volumetric compression modulus under hydrostatic compression and uniaxial compression. The friction

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Mao, Haiying, Cong Hu, Jianfeng Xue, et al. "Experimental and Meshless Numerical Simulations on the Crack Propagation of Semi-Circular Bending Specimens Containing X-Shaped Fissures Under Three-Point Bending." Materials 17, no. 14 (2024): 3547. http://dx.doi.org/10.3390/ma17143547.

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Cracks in rock and concrete have a great adverse effect on the stability of engineering structures; however, there are few studies on X-shaped fissures which widely exist in rock and concrete structures. Based on this background, three-point bending fracture tests of SCB specimens containing X-shaped fissures are carried out. The momentum equations in the SPH method are improved, and the crack propagations of SCB specimens under three-point bending are simulated. The results show that cracks grow simply along the vertical direction in the sample with no X-shaped fissures, and the existence of

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Ören, A. H., S. Durukan, and A. Ş. Kayalar. "Influence of compaction water content on the hydraulic conductivity of sandbentonite and zeolite-bentonite mixtures." Clay Minerals 49, no. 1 (2014): 109–21. http://dx.doi.org/10.1180/claymin.2014.049.1.09.

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AbstractAlthough investigation of the hydraulic conductivity behaviour of zeolite-bentonite mixtures (ZBMs) has been a topic of interest for researchers recently, the influence of compaction water content on the hydraulic conductivity of ZBMs has not been studied so far. This study discusses the hydraulic conductivities of ZBMs and compares the results with those of sand-bentonite mixtures (SBMs). The hydraulic conductivities of SBMs were unaffected by compaction water content and bentonite content, but the hydraulic conductivities of ZBMs were substantially different in mixtures containing 10

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Xu, Ying, Qiangqiang Zheng, Xin Gao, Rongzhou Yang, Xian Ni, and Qianqian Wang. "Quantitative Damage and Fracture Mode of Sandstone under Uniaxial Load Based on Acoustic Emission." Advances in Civil Engineering 2020 (December 18, 2020): 1–9. http://dx.doi.org/10.1155/2020/6685795.

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The damage degree and fracture mechanism of the rock are important to the bearing performance of the rock mass and the stability of the overlying structure. Most of the existing damage models for characterizing rock damage exclude the range of postpeak stress or do not consider the compaction and closure stage of the fracture, and the description of the quantitative damage of sandstone is not accurate enough. In addition, the description of the rock fracture mechanism under load is not exact enough. Aiming at the problem of quantitative damage and fracture mechanism of the loaded rock, this pa

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Vieira e Silva, Amanda, Rosiel Ferreira Leme, Francisco Chagas da Silva Filho, Thales Elias Moura, and Grover Romer Llanque Ayala. "Empirical Models to Predict Compaction Parameters for Soils in the State of Ceará, Northeastern Brazil." Ingeniería e Investigación 42, no. 1 (2021): e86328. http://dx.doi.org/10.15446/ing.investig.v42n1.86328.

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This work developed prediction models for maximum dry unit weight (γd,max) and optimum moisture content (OMC) for compacted soils in Ceará, Brazil, ba M Winnie the Pooh sed on index and physical properties. The methodology included data from soils used in the construction of 15 dams in Ceará, with available information regarding laboratory tests of interest. Correlations were developed using non-linear regression, from 169 laboratory results (83 for training and 86 for validating the models), which presented a R2 of 0,763 for MoPesm (prediction model for γd,max) and 0,761 for MoTuo (model for

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Abdullah, S., A. A. Arifin, A. Othman, A. K. Ariffin, and N. A. N. Mohamed. "Crushing Behavior of Hybrid Foam-Filled Pultruded Composite under Quasi-Static Oblique Loading." Advanced Materials Research 664 (February 2013): 649–53. http://dx.doi.org/10.4028/www.scientific.net/amr.664.649.

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In this present paper, the two square cross-section pultruded composite tubes E-glass reinforced polyester unfilled and polyurethane hybrid foam-filled subjected to oblique load are investigated and examined experimentally. The oblique angles were varied from 5 to 20 with an increment of every 5 degree. The bottom base platen of clamped specimen was adjusted inclination angle of loading direction with respect to the tube axis. During the experimental observation, three characteristic crushing stages were identified as initial peak load stage, progressive crushing stage and compaction zone stag

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Wang, Hongfei, Jianlei Liu, Tao Zhang, and Shiwei Shen. "Freezing Shear Characteristics and Failure Mechanism of Rock Joints with Different Opening Degrees and JRC." ce/papers 8, no. 2 (2025): 577–89. https://doi.org/10.1002/cepa.3148.

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AbstractOn the basis of the rock‐coupled joints of Jiangluling Tunnel on the G214 line in the permafrost region of Qinghai, a freeze‐shear test was carried out to study the shear characteristics and failure mechanism of the jointed rock with different opening conditions. Given the 3D shape parameters of the joint surface the frozen shearing characteristics of the joint surface and its failure mechanism were revealed building on the theory of adhesion between the joints and the ice layer. Results showed that shear failure of frozen joints comprised four stages, compaction, sustained deformation

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Zhong, Wei, Shuai Zhang, and Na He. "An Experimental Study on the Dynamic Evolution Characteristics of Soil Arching and the Rational Spacing of Anti-Slide Piles." Sustainability 14, no. 14 (2022): 8566. http://dx.doi.org/10.3390/su14148566.

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In order to analyse the dynamic evolution characteristics of soil arching during sliding processes, we conducted a series of model push-pile and direct shear tests. The tests’ results were used to design a relative displacement monitoring system and to introduce two dimensionless parameters (the push–compaction ratio (e) and the different degrees of push–compaction (t)) to investigate the degree of uneven soil deformation during the sliding processes. This innovative method was used to analyse the rational spacing between adjacent anti-slide piles. The results revealed that there was a push-to

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Cao, Shuai, Erol Yilmaz, Weidong Song, and Gaili Xue. "Assessment of Acoustic Emission and Triaxial Mechanical Properties of Rock-Cemented Tailings Matrix Composites." Advances in Materials Science and Engineering 2019 (October 16, 2019): 1–12. http://dx.doi.org/10.1155/2019/6742392.

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Acoustic emission (AE) test is a powerful technique for examining the sounds of cracks growing, breaking, and other modes of damage in cementitious materials deforming under stress, such as rock-cemented tailings matrix composites (RCTMC). RCTMC, an engineered mixture of tailings, cement, rock, and water, is widely used to fulfill numerous important roles at underground mine sites as a construction material and a ground support tool. To study the mechanical strength and AE properties of RCTMC, compression testing was carried out using a triaxial compression test system (TAW-2000) and AE monito

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Yang, Xuefei, Dongxia Chen, Yue Liu, and Sheng Zhang. "An Experimental Study with Model Calibration for the Permanent Strain of Granite Residual Soil Subgrade under Drying-Wetting Cycles." Geofluids 2023 (February 4, 2023): 1–19. http://dx.doi.org/10.1155/2023/5173170.

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The permanent strain is one of the most important dynamic properties of the granite residual soil. To systematically study the dynamic deformation characteristics of granite residual soil (GRS) under the drying-wetting (D-W) cycles, a series of dynamic triaxial tests is carried out to obtain the stress-strain relationship of GRS with various fine particle contents subjected to D-W cycles. The experimental results show that the growth of permanent strain consists of two stages, namely, compaction stage and compression stage. The main effect of D-W cycles is reflected in the compression stage. O

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Yang, Jiaqi, Jirong Wang, Jun Li, Lianwen Shi, and Xiangwu Dai. "Optimum Design of Multidischarge Outlet Biomass Briquetting Machine." Complexity 2020 (October 22, 2020): 1–8. http://dx.doi.org/10.1155/2020/8818632.

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A high-efficiency biomass material was designed according to the densification mechanism of biomass. This machine improved the efficiency by recombining the feeding stage, prepressing stage, compaction stage, pressure-holding stage, and pushing stage of the compression process, so that part of the working stages was carried out simultaneously. To further improve efficiency and rationally allocate power at each stage, in this paper, we established a mathematical model for the machine. We use the nonlinear programming in Matlab (2016b) to solve the minimum value of the model, making the machine

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Chi, Xiaolou, Qiang Fu, and Ke Yang. "Experimental Study on Compaction Characteristics and Mechanical Behavior of Crushed Rock Masses." Geofluids 2022 (July 15, 2022): 1–17. http://dx.doi.org/10.1155/2022/9325958.

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The compaction and consolidation process of a regenerated roof can be divided into two stages, namely, secondary fragmentation of crushed rock masses and pore structure adjustment. Therefore, the mechanical properties of the regenerated roof differs significantly from those of the primary roof. We performed confined compression tests of crushed mudstones and sandy mudstones using a self-developed compression testing apparatus. We studied the influence of the moisture content, compression ratio, particle size, and volume-based degradation on the compression and consolidation characteristics bas

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Singh, S. K., I. J. Jordaan, J. Xiao, and P. A. Spencer. "The Flow Properties of Crushed Ice." Journal of Offshore Mechanics and Arctic Engineering 117, no. 4 (1995): 276–82. http://dx.doi.org/10.1115/1.2827234.

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The flow properties of crushed ice under plane-strain conditions are examined. The analysis is based on a set laboratory experiments. The geometric configuration provided a wide range of pressures and material behaviors. At the early stages of the extrusion, and near the exit, where pressures are low, models based on Mohr-Coulomb flow theory describe the extrusion of crushed ice satisfactorily. At more advanced stages of the tests, high pressures developed, crushed ice became fused, and its behavior was similar to that of highly damaged polycrystalline ice. An extrusion model based on a nonlin

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Li, Liuxi, Chao Deng, Yuan Chen, Zhichao Xu, Wenqin Yan, and Yi Zhou. "Experimental Analysis of the Slurry Diffusion Behavior Characteristics of Point Source Grouting and Perforated Pipe Grouting in Sandy Soil." Buildings 15, no. 7 (2025): 1133. https://doi.org/10.3390/buildings15071133.

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Grouting technology is widely used in foundation treatment to achieve the uplifting and correction of buildings. In this context, analyzing the slurry diffusion mechanism and the resulting behavioral characteristics is crucial for guiding precise engineering design practices. This study utilized an independently developed grouting model testing system to conduct grouting experiments on sandy soil employing diverse grouting methodologies and infiltration diffusion patterns. The objectives were to elucidate the characteristics of grouting pressure, lifting displacement, and stress variations wit

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Mikhailov, A., Ye Shtefan, and O. Mikhailov. "Modeling of manufacturing processes of thin-walled bushings from porous blanks using direct extrusion and radial compaction." Uspihi materialoznavstva 2023, no. 7 (2023): 19–26. http://dx.doi.org/10.15407/materials2023.07.002.

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The deformation process of powder materials thin-walled bushings manufacture was investigated by computer modeling. Two shape formation bushings schemeswere considered (direct extrusion and radial compaction).A continuum approach was used to create a modeling method. The method is based on rheological models of porous body plastic deformation and the finite element method. The accepted material rheological model allows describing the deformation of both powder and porous blanks. It takes into account the different resistance of these materials in tension and compression. Modeling of the deform

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Brzeziński, Karol, Maciej Maślakowski, and Paweł Liszewski. "Evaluation of the Volume Measurement Optical Method Suitability for Determining the Relative Compaction of Soils." Civil Engineering Journal 4, no. 9 (2018): 2052. http://dx.doi.org/10.28991/cej-03091138.

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The goal of this paper is evaluation of the volume measurement optical method suitability for determining relative compaction of soils. The Structure for Motion technique was utilized in order to achieve the goal by making the three-dimensional models (with Bentley ContextCapture software). Created models were used in volume measurement of the pit-holes. The results were compared with the basic methods: the sand cone test and the water method. The laboratory tests were carried out in two stages. In the first stage, the optical method was tested in similar to operating conditions. Ten holes wer

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Bachawala, Sunidhi, Rexonni B. Lagare, Abigail B. Delaney, Zoltan K. Nagy, Gintaras V. Reklaitis, and Marcial Gonzalez. "Rational Function-Based Approach for Integrating Tableting Reduced-Order Models with Upstream Unit Operations: Dry Granulation Case Study." Pharmaceuticals 17, no. 9 (2024): 1158. http://dx.doi.org/10.3390/ph17091158.

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We present a systematic and automatic approach for integrating tableting reduced-order models with upstream unit operations. The approach not only identifies the upstream critical material attributes and process parameters that describe the coupling to the first order and, possibly, the second order, but it also selects the mathematical form of such coupling and estimates its parameters. Specifically, we propose that the coupling can be generally described by normalized bivariate rational functions. We demonstrate this approach for dry granulation, a unit operation commonly used to enhance the

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Sun, Haitao, Pei Wang, Yuhua Xing, Dapeng Zhang, and Siying Li. "Investigating Soil Water Retention and Water Content in Retrogressive Thaw Slumps in the Qinghai-Tibet Plateau, China." Water 16, no. 4 (2024): 571. http://dx.doi.org/10.3390/w16040571.

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Retrogressive thaw slumps (RTSs) are becoming more common on the Qinghai-Tibet Plateau as permafrost thaws, but the hydraulic properties of thaw slumps have not been extensively studied. To fill this knowledge gap, we used the “space-for-time substitution method” to differentiate three stages of RTSs: original grassland, collapsing, and collapsed. Our study included on-site investigations, measurements in the laboratory, and measured and simulated analyses of soil water retention curves and estimated hydrological properties. Our findings show that the measurements and simulated analyses of soi

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