Experimental and Numerical Investigation of Mechanical Behaviors of Cemented Soil–Rock Mixture

Jin, Lei; Zeng, Yawu; Xia, Lei; Yang, Yong

doi:10.1007/s10706-016-0109-4

Cited by 31 publications

(12 citation statements)

References 22 publications

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Section: Introductionmentioning

confidence: 99%

“…Among the existing random structure modeling methods, the granular discrete element method (DEM) can describe the components with the heterogeneous and discontinuous characteristics in SRMs. The DEM modeling method has been widely used to study the strength and deformation characteristics of SRMs 3,23,24 and to simulate the seepage of porous media in combination with the LBM. 15,20 In theoretical analyses, Xu and Chen et al 7,9 used four classical structural models of heterogeneous composite materials to predict the permeability coefficient of SRMs with different rock contents, and compared the predicted values with the results of numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

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Three‐dimensional lattice Boltzmann simulation of the permeability of soil‐rock mixtures and comparison with other prediction models

Jin

Cheng

Zhang

et al. 2021

Num Anal Meth Geomechanics

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With the discrete element method and the proposed virtual slicing technique for three‐dimensional discrete element model, random pore‐structural models of soil‐rock mixtures (SRMs) are constructed and voxelized. Then, the three‐dimensional lattice Boltzmann method (LBM) is introduced to simulate the seepage flow in SRMs on the pore scale and the influences of rock content, rock size, relative density on the simulated permeability of SRMs are comprehensively investigated. Finally, several theoretical models are introduced to predict the permeability of SRMs, and comparison is made between the results given by these prediction models and the numerical results obtained in this study. The results show that the permeability of SRMs presents a gradually increasing trend with the increase of rock content, and the rate of increase is also getting larger. When the other conditions remain unchanged, the permeability of SRMs decreases with the increase of relative density. When the rock content is lower than a threshold value, the permeability decreases as the rock size increases; however, this trend gets reversed when the rock content exceeds the threshold value. The permeability values of SRMs simulated with the LBM are lower in different levels than those calculated with the HS model, EMA model, and Zhou model, but most of them are very close to those predicted by the Daigle model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three‐dimensional lattice Boltzmann simulation of the permeability of soil‐rock mixtures and comparison with other prediction models

Jin

Cheng

Zhang

et al. 2021

Num Anal Meth Geomechanics

Self Cite

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show abstract

Section: Introductionmentioning

confidence: 99%

Investigation of the Permeability of Soil-rock Mixtures Using Lattice Boltzmann Simulations

Jin

Zeng

et al. 2021

Period. Polytech. Civil Eng.

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Based on the discrete element method and the proposed virtual slicing technique for three-dimensional discrete element model, random pore-structural models of soil-rock mixtures are constructed and voxelized. Then, the three-dimensional lattice Boltzmann method is introduced to simulate the seepage flow in soil-rock mixtures on the pore scale. Finally, the influences of rock content, rock size, rock shape and rock orientation on the simulated permeability of soil-rock mixtures are comprehensively investigated. The results show that the permeability of soil-rock mixtures remarkably decreases with the increase of rock content. When the other conditions remain unchanged, the permeability of soil-rock mixtures increases with the increase of rock size. The permeability of soil-rock mixtures with bar-shaped rocks is smaller than that of soil-rock mixtures with block-shaped rocks, but larger than that of soil-rock mixtures with slab-shaped rocks. The rock orientation has a certain influence on the permeability of SRMs, and the amount of variation changes with the rock shape: when the rocks are bar-shaped, the permeability is slightly decreased as the major axes of these rocks change from parallel to perpendicular with respect to the direction of main flow; when the rocks are slab-shaped, the permeability decreases more significantly as the slab planes of these rocks change from parallel to perpendicular with respect to the direction of main flow.

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“…The resilient modulus is defined as the ratio of cyclic deviatoric stress to relative elastic strain in the Repeated Load Triaxial (RLT) test [18]. The recent researches on resilient behavior are always dependent on the approach of phenomenology, which requires a large number of physical model tests and statistical methods to reveal the changes in its mechanical property [19]. In fact, with limited test conditions, the results obtained in the laboratory test may differ greatly from the actual engineering [20].…”

Section: Introductionmentioning

confidence: 99%

Resilient Properties of Soil-Rock Mixture Materials: Preliminary Investigation of the Effect of Composition and Structure

Qian

Yao

et al. 2020

Materials

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The physical composition and stress state of soil-rock mixture (SRM) materials have a crucial influence on their mechanical properties, and play a vital role in improving the performance of subgrade. To reveal the resilient behavior and mesostructure evolution of SRM materials, triaxial tests and discrete element method (DEM) numerical analysis have been carried out. In the triaxial test section, the mechanical response of SRM materials was investigated by preparing samples under different stress states and physical states and conducting triaxial tests on samples. Simultaneously, a new irregular particle modeling method was developed and applied to the discrete element modeling process to analyze the mesostructure evolution of SRM materials under cycling loading. First, a cyclic triaxial test of SRM material is performed on the SRM material, and the effects of bulk stress, octahedral shear stress and rock content on the resilient modulus of the SRM material are analyzed. It is revealed that the resilient modulus increases with increasing bulk stress and rock content, and decreases with increasing octahedral shear stress. Based on a new resilient modulus prediction model, the relationships among the rock content, stress state and resilient modulus are established. Then, based on an improved DEM modeling method, a discrete element model of the SRM is established, and the influence of rock content on coordination number and mesostructure evolution of the SRM is analyzed. The results show that in SRM materials, the increase of crushed rock changes the mesostructure of the SRM material. With the increase of rock content, the internal contact force changes from “between soil and rock” to “between rocks”, and the skeleton formed in the rocks gradually develops overall stiffness. Under the condition of low stress, the anisotropy of the SRM material is mainly caused by the shape and grade distribution of crushed rock. The induced anisotropy caused by the change of stress state has little effect on its mechanical behavior, which may lead to the greater dispersion of multiple SRM test results.

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Experimental and Numerical Investigation of Mechanical Behaviors of Cemented Soil–Rock Mixture

Cited by 31 publications

References 22 publications

Three‐dimensional lattice Boltzmann simulation of the permeability of soil‐rock mixtures and comparison with other prediction models

Three‐dimensional lattice Boltzmann simulation of the permeability of soil‐rock mixtures and comparison with other prediction models

Investigation of the Permeability of Soil-rock Mixtures Using Lattice Boltzmann Simulations

Resilient Properties of Soil-Rock Mixture Materials: Preliminary Investigation of the Effect of Composition and Structure

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