Abstract:Shed tunnels are often used to protect mountain traffic routes from the impact of rock avalanche flow caused by landslides or collapses.In order to study the influential factors of the maximum impact force of rock avalanche flow on a rock shed tunnel, a coupled numerical model of a barrier structure impacted by rock avalanche flow was established based on the coupled DEM-FEM method.The effectiveness of the coupled method was verified by comparing with test results.The entire impact process was studied, and the relationships between the maximum impact force and the bulk density of rock avalanche flow, the impact height of rock avalanche flow and the slope angle were analyzed respectively.The results show that the coupled model vividly reproduces the three stages of rock avalanche flow, i.e., the initiation acceleration, impact and accumulation stage.Friction energy dissipation is the most important energy dissipation mode in the whole impact process.The maximum impact force increases linearly with the bulk density.The maximum impact force increases in the form of a power function with a power index less than 1 as the impact height increases, and increases in the form of a power function with a power index great than 1 as the slop angle increases.The sensitivity values of the bulk density, impact height, and slope angle of the rock avalanche flow to the maximum impact force are 1.0, 0.63, and 2.68, respectively.The parameters with high sensitivity should be given priority in the design of shed tunnels.
柳春1,余志祥1,2,刘宇鹏1,黄俊飞1,赵世春1,2. 碎屑流冲击棚洞的最大冲击力影响因素研究[J]. 振动与冲击, 2020, 39(2): 195-203.
LIU Chun1,YU Zhixiang1,2,LIU Yupeng1,HUANG Junfei1,ZHAO Shichun1,2. Influential factors of the maximum impact force of rock avalanche flow on a shed tunnel. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(2): 195-203.
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