Research on strength of soil-rock mixture based on particle discrete element method
Wang Huanling1 Sha Cong1 Xu Weiya2 Meng Qingxiang2
1. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;
2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China
Abstract： Soil-rock mixture is a kind of discontinuous media, whose mesostructure has a major impact on the strength characteristics. The conceptual model of soil-rock mixture is formed by using the technique of randomly generating polygon block. The shape coefficient is introduced as an index to measure the concave and convex degree of the block stone. The appropriate parameters are selected for the simulation by the laboratory test method of Donglingxin deposit. The influence of rock concavity, rock inclination and boundary conditions on the strength characteristics of soil-rock mixtures is studied by numerical biaxial test. The results show that the greater the degree of concavity and stone content, the easier the rocks contact with each other. Thus a stable skeleton will be formed and lead to an increase in strength. If the effect of rock breaking on the simulation results is ignored, when the long axis of the block stone is parallel or perpendicular to the direction of the principal stress, the strength of the specimen is larger, while when the long axis of the block stone is oblique to the direction of the principal stress, the strength of the specimen is smaller. With the increase of specimen size, the influence of boundary effect on simulation results decreases.
王环玲 沙聪 徐卫亚 孟庆祥. 基于颗粒离散元的土石混合体强度影响研究[J]. 土木工程学报, 2020, 53(9): 106-114.
Wang Huanling Sha Cong Xu Weiya Meng Qingxiang. Research on strength of soil-rock mixture based on particle discrete element method. 土木工程学报, 2020, 53(9): 106-114.
