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DEM investigation on the evolution of microstructure in granular soils under shearing

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Abstract

The mechanical behaviors of granular soils at different initial densities and confining pressures in the drained and undrained triaxial tests are investigated micromechanically by three-dimensional discrete element method (DEM). The evolutions of the microstructure in the numerical specimen, including coordination number, contact force and anisotropies of contact normal and contact force, are monitored during the shearing. The typical shear behaviors of granular soils (e.g. strain softening, phase transformation, static liquefaction and critical state behavior) are successfully captured in the DEM simulation. It is found that the anisotropies of contact normal, normal and tangential contact forces comprise the shear resistance and show different evolution features during shearing. After large strain shearing, the microstructure of the soil will finally reach a critical state, although the evolution path depends on the soil density and loading mode. Similar to the macroscopic void ratio \(e\) and deviatoric stress \(q\), the coordination number and anisotropies of contact normal and contact force at the critical state also depend on the mean normal effective stress \(P^{\prime }\) at the critical state.

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Acknowledgments

The work presented in this paper is supported by the National Basic Research Program of China (973 Program, Grant No. 2012CB719803), National Natural Science Foundation of China (Grant Nos. 51308408, 11372228, 41272291 and 51238009) and Postdoctoral Science Foundation of China (Grant No. 2013M541543). The authors are also very grateful to the reviewers for their valuable comments and suggestions.

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  1. Department of Geotechnical Engineering & Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai, China

    Xiaoqiang Gu, Maosong Huang & Jiangu Qian

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  1. Xiaoqiang Gu
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Correspondence to Maosong Huang.

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Gu, X., Huang, M. & Qian, J. DEM investigation on the evolution of microstructure in granular soils under shearing. Granular Matter 16, 91–106 (2014). https://doi.org/10.1007/s10035-013-0467-z

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