Parameter Inversion and Direct Shear Simulation of Discrete Element Model of Soil-Rock Mixture Based on 3D Scanning Technology
WANG Shuyong1,2, ZHANG Lingkai1,2, CHEN Guoxin1,2, YUAN Jun3
1 College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China 2 Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Urumqi 830052, China 3 Northwest Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Xi'an 710075, China
Abstract: Based on three-dimensional scanning technology, the databases with the real rock blocks shape of different particle sizes and discrete element models of soil-rock mixture (S-RM) samples with different stone contents were established. Mechanical sensitivity between the macro-meso parameters was analyzed and the linear equations were built according to the principle of orthogonal test design, calibrating meso-para-meters for the discrete element model by mechanic tests data. The large-scale numerical shear tests of the stone contents' S-RM samples under different normal stresses were conducted. The results show that: the shear stress increases gradually and the volume deformation first contraction and then dilatancy during the shear process. It is noteworthy that with the increase of normal stresses, the peak strength and shear contraction deformation all increase, but the initial modulus changes slightly. The S-RM has no obvious peak strength under low contents of stone, and then the phenomenon of strain hardening is significant and shearing is the mainly deformation. The initial modulus and shear strength increases with the increase of stone content. For S-RM with high contents of stone, the peak stress occurs and then shows strain softening and prominent shear dila-tancy deformation in the late shear. The strength of force chain and initial coordination number of S-RM increases with the increase of either the stone contents or the normal stress. The increase of normal stress increase the overall level of coordination number. In shearing process, for S-RM with low contents of stone, the coordination number increase gradually with the increase of shear displacement, while the trend decreases for the stone contents of S-RM with high decreases. The fluctuation of coordination number and sample volume tends to be stable when reach to the critical value. As the stone content increases continually, the shear zone of the S-RM sample becomes wider, the gradient of velocity and displacement around the shear plane increases. A counter-clockwise vortex velocity field appears in the samples during the mid-to-late shear. The coordination number of dynamic shear box large compared to that of static shear box, and the coordination number in the shear zone fluctuates the most. In the S-RM, the weak force chain is scattered and sparse, while the strong force chain is concentrated. During the shear process, the strength of force chain increases first and then decreases. With the diverges and thickens of force chain, eventually the locally force chain are connected to each other diagonally.
王舒永, 张凌凯, 陈国新, 袁俊. 基于三维扫描技术的土石混合体离散元模型参数反演及直剪模拟[J]. 材料导报, 2021, 35(10): 10088-10095.
WANG Shuyong, ZHANG Lingkai, CHEN Guoxin, YUAN Jun. Parameter Inversion and Direct Shear Simulation of Discrete Element Model of Soil-Rock Mixture Based on 3D Scanning Technology. Materials Reports, 2021, 35(10): 10088-10095.
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2021, Vol. 35 
