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Microscopic deformation mechanisms of triaxial test of frozen clay analyzed by discrete element method

YIN Nan;LI Shuangyang;PEI Wansheng;ZHANG Mingyi;DONG Yun;State Key Laboratory of Frozen Soil Engineering,Cold and Arid Environmental and Engineering Research Institute,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Department of G eotechnical Engineering,Tongji University;  
Based on three dimensional discrete element method(DEM) of particle flow,all particles are assigned to corresponding microscopic parameters and the cementation of ice between two contacting particles is simulated by a bonding model,which is effective in a limited radius,a three dimensional numerical model of frozen clay is established.A series of triaxial experiments on frozen clay are simulated under different temperatures and confining pressures,which shows that the simulated stress-strain relation agrees with experimental data very well.Numerical simulation results show that the adhesive contact will gradually fail with increase of confining pressure,together with expanding destruction area of the cement ice in shear zone.But an opposite phenomenon will appear with decreasing temperature.All these microscopic changes will have a great impact on macroscopic mechanical deformation of frozen clay.It is also found that the microscopic parameters of particles heavily depend on temperature.The idea and method of this paper may help to simulate mechanical behaviors of frozen clay by discrete element method(DEM).
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