Influence of barrier shape on impact dynamics of debris flow entraining a boulder onto rigid barriers  

作　　者：ZHAO Yongjie MA Yuangang LUO Gang SHEN Weigang GAO Guohui ZHAO Meng CHEN Wei 

机构地区：[1]State Key Laboratory of Bridge Intelligent and Green Construction,Wuhan 430034,China [2]China Railway Bridge Science Research Institute Co.,Ltd,Wuhan 430034,China [3]Faculty of Geosciences and Engineering,Southwest Jiaotong University,Chengdu 611756,China

出　　处：《Journal of Mountain Science》2024年第12期3971-3985,共15页山地科学学报（英文）

基　　金：supported by the National Key Research and Development Program of China(No.2022YFC3005704);the National Natural Science Foundation of China(No.42277143);the Natural Science Foundation of Sichuan Province(2024NSFSC0100);the Fundamental Research Funds for the Central Universities(No.2682023ZTPY022);Projects of Science and Technology Research and Development Program of China Railway Group Limited(2021-Special Class-03);the Natural Science Foundation of Sichuan Province(2024NSFSC0834).

摘　　要：Rigid barrier is a straightforward and effective countermeasure widely used for mitigating debris flow.However,in current designs,it remains unclear how to optimize the rigid barrier to enhance its mechanical properties.Therefore,this study investigates the influence of the shape of the upstream face of the rigid barrier,referred to as the'barrier shape',on the impact dynamics of debris flow entraining a boulder onto rigid barrier.This study employs a coupled numerical approach involving smoothed particle hydrodynamics(SPH),the discrete element method(DEM),and the finite element method(FEM).The simulation results demonstrate that the barrier shape can affect the mechanical properties of the rigid barrier by altering the interaction mode between the debris flow and the barrier.Compared to vertical and slanted barriers,a curved barrier exhibits superior mechanical properties when subjected to debris flow impact.Furthermore,reducing the slope of the upstream face appropriately proves to be an effective method for enhancing the impact resistance of slanted barriers.The relevant findings from this study can serve as valuable references for the structural optimization of rigid barriers.

关 键 词：Debris flow Rigid barrier Barrier shape Impact dynamics Numerical modelling 

分 类 号：P642.23[天文地球—工程地质学]