岩土工程学报2024，Vol.46Issue(8)：1753-1761,9.DOI:10.11779/CJGE20230463
考虑强度速率衰减效应的地震滑坡SPH-FEM模拟
SPH-FEM simulation of landslide induced by earthquake considering velocity weakening effect of frictional strength
摘要
Abstract
Based on the SPH-FEM coupling method,a frictional velocity weakening model for sliding surface is introduced and a numerical simulation method which can simulate the whole failure process of the landslides triggered by earthquake is proposed.The Tangjiashan landslide is simulated by the proposed method,and the simulated results are consistent with the on-site investigations and the laboratory test results.Based on the calculated frictional strength on the sliding surface,the whole failure process of the Tangjiashan landslide is divided into four stages:the triggering stage,the frictional weakening stage,the low frictional stage and the gradually stabilizing stage.The simulated results indicate that the high-speed movement of the sliding body is triggered by the interaction of the increase of the velocity and the decrease of the frictional strength.The parameter R defined by the ratio of the dynamic frictional force fd to the dynamic sliding force Td is suggested to evaluate the failure of large landslides.When R less than 1 occurs for the first time,the stress on the sliding surface reaches the shear strength and slope failure occurs.Based on the evolution of friction coefficient at different positions of the sliding surface,the frictional weakening of the sliding surface and the gradual failure of the landslide are revealed.The large-scale landslide is supposed to be triggered by the joint effects of the earthquake and the frictional velocity weakening.关键词
大型滑坡/滑动面/摩擦强度/速度衰减效应/SPH-FEM耦合方法Key words
large-scale landslide/sliding surface/frictional strength/velocity weakening effect/SPH-FEM coupling method分类
建筑与水利引用本文复制引用
魏星,程世涛,谢相焱,陈睿..考虑强度速率衰减效应的地震滑坡SPH-FEM模拟[J].岩土工程学报,2024,46(8):1753-1761,9.基金项目
国家自然科学基金项目(41977235) （41977235）
