Effect of local non-convexity on the critical shear strength of granular materials determined via th

• 作 者: Zhihong Nie Shunkai Liu Wei Hu Jian Gong
• 机 构: School of Civil Engineering, Central South University, Changsha, Hunan 410075, China“,”Hunan Provinc
• 出 处: 颗粒学报（英文版）
• 发表日期: 2020年5期
• 关键词: Multi-sphere clump Local non-convexity Discrete element method Biaxial shear tes

Multi-sphere clumps are commonly used to simulate non-spherical particles in discrete element method simulations.It is of interest whether the degree of local non-convexity λ affects the mechanical behaviour of granular materials with the same non-convexity η.A series of discrete-element-method biaxial shear tests are conducted on rough particle packings with rη=0.075 and different λ values (ranging from 0.134 to 0.770).The microscale results show that the contact type changes with an increase in λ.However,the critical strength is independent of λ.The evaluation of the contributions of different contact types to the critical shear strength and a detailed analysis of the anisotropies help clarify the microscopic mechanisms that result in the independence of the critical shear strength from λ.