Prediction of compressive strength of the welded matrix-rock mixture by meso-inclusion theory

Ren, Minghui; Guo-fan, Zhao

doi:10.1016/j.ijrmms.2021.104612

Cited by 10 publications

(2 citation statements)

References 20 publications

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“…6.2.3 Simulation results of rock block rotation displacement of soil-rock mixture slope predicted by multi-scale coupled finite element method It can be seen from Figure 15 that the rotational displacement of rock blocks in the soil-rock mixture slope is mainly concentrated within the shear band, wherein the maximum rotational displacement of rock blocks is 40.7 °, and the rotational displacement of particles outside the shear band is about 0 °. The rotational displacement of the rock blocks in the shear band of the soil-rock mixture slope changes the mesostructures of the soil-rock mixture, which produces unrecoverable plastic deformation (Ren and Zhao 2021). In this process, the directional alignment of the rock blocks caused by their rotational displacement destroys the occlusion effect between rock blocks, and weakens the ability of rock blocks to transfer shear deformation to the surrounding soil matrix, thus leading to the plastic deformation being restrained and the occurrence of plastic strain localization.…”

Section: Parameter Determination Of the Multiscale Coupled Finite Ele...mentioning

confidence: 99%

A multiscale finite element method for soil-rock mixture

Liu¹,

Dong

2023

Front. Mater.

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Soil-rock mixture is a complex multi-phase composite geotechnical material, and its strength is determined by the physical properties of constituent multi-phase materials and their coupling mechanical response between different phases of materials. Based on the Eshelby-Mori-Tanaka equivalent inclusion average stress principle, a theoretical model of multi-scale coupled shear strength of soil-rock mixture considering the interaction effect of rock block and soil is established, and the rotational freedom reflecting the microscopic motion details of rock block is introduced. Moreover, a multi-scale coupled constitutive relationship of soil-rock mixture is derived and compiled into a multi-scale finite element program. Based on the large-scale direct shear test of soil-rock mixture, the model parameters of the multi-scale finite element method are determined, and then the multi-scale finite element program is used to simulate and predict the cross-scale deformation process of the soil-rock mixture slope. The results show that the multi-scale finite element method can effectively describe the influence of the mechanism of the micro motion characteristics of the soil-rock mixture on the macro mechanical response, and can effectively overcome the pathological mesh-dependency of the classical finite element method; the rotation displacement of the rock block is mainly concentrated within the shear zone of the slope. The maximum rotational displacement of rock blocks inside the soil-rock mixture slope is 40.7°, and the rotational displacement of rock blocks outside the shear zone is about 0°. The physical mechanism of the cross scale evolution of the shear band of the soil-rock mixture slope is that: the rotation of the rock blocks weakens the strain transmission ability between the rock block and the matrix soil, thus forming the concentration and development of the plastic strain, and finally leading to the penetration of the shear bands of the slope and the overall sliding failure.

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Section: Parameter Determination Of the Multiscale Coupled Finite Ele...mentioning

confidence: 99%

A multiscale finite element method for soil-rock mixture

Liu¹,

Dong

2023

Front. Mater.

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“…In practical engineering, there are many factors affecting the permeability of bimsoils, among which the cementation state is an important parameter (Lin et al 2019;Ren and Zhao 2021). The previous research employed compaction number to ensure the relative density of specimens and study on the influence of compaction characteristics to maximum dry density and optimum water content (Wang et al 2019a;Spagnoli and Shimobe 2020).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the permeability and seepage characteristics of bimsoils

Wang

Zheng

Wang

et al. 2021

Geomatics, Natural Hazards and Risk

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Bimsoils are a loose rock and soil system, and the occurrence of geological hazards is closely related to water. To investigate the permeability and seepage characteristics of bimsoils, factors on permeability are discussed in detail considering cementation state, and variable mass seepage is studied tentatively with selfdeveloped apparatus. Results shown that the order of factors on permeability is rock content > cementation degree > rock size > Talbot index (describing the mass percentage for different particle size of sand), and there are significant differences between factors. Besides, permeability generally increases with the increase of rock content and decreases with the increase of cementing agent content, while increases slightly due to agglomeration effect at the clay content of 8%. It is more obvious for reducing the permeability of higher rock content bimsoils by strong cementing agent, however, it tends to be same eventually with cement content increasing. The seepage of bimsoils is dominated by fine particle losses, and the secondary inrush occurs under the larger particle radius ratio. Moreover, particle losses and the time needed for secondary inrush both increase with the increase of particle radius ratio. The results would provide consults for the preparation of similar materials and the prevention of tunnels and underground engineering disasters.

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