工程地质学报2017，Vol.25Issue(3)：815-823,9.DOI:10.13544/j.cnki.jeg.2017.03.029
土质滑坡运动全过程物质点法模拟及其应用
MATERIAL POINT METHOD FOR RUN-OUT PROCESS SIMULATION OF SOIL LANDSLIDES AND APPLICATION
摘要
Abstract
Material Point Method(MPM) belongs to one of the meshless numerical analysis methods.It is able to integrate a variety of constitutive models and consider the fluid-solid coupling behavior within soils,so as to effectively simulate the large and extra-large deformation of landslides.This paper introduces the fundamental principles of MPM,the governing equations and the solving formats.Based on the 5 types of porous media characterization models of MPM,we briefly review the state-of-the-art of run-out process simulation of soil landslides using MPM.Subsequently,we simulate the run-out process of Shenzhen "12·20" landfill landslide using MPM with the single-layer and sing-phase material point model.Linear loading is applied to identify the initial stress field.Elasto-palstic constitutive models using Drucker-Prager yield criterion,GIMP algorithm and MUSL solving format are also used,respectively.The simulation results show that the maximal sliding distance reaches 510m,after the slope losing its stability.Moreover,the longitudinal distance of the landslide scope is 1050m and the minimal landslide angle is 5.95°,both agreeing well with the observed results.The evolution trends of the equivalent plastic strain zone within the soil exhibit that the landslide mechanism is progressive failure.Specifically,shear failure of the soil occurs at the slope toe initially,and tensile fracture occurs at the slope top subsequently,with both plastic zones extending toward the interior of the slope along the bedrock.The extra-large deformation occurs once the sliding surface is cut-through to accelerate the sliding.The MPM simulation for the run-out process of landslides can shed light on the hazardous behaviors of landslides and provide assistants for landslide prevention.关键词
土质滑坡/运动全过程/物质点法/人工填土边坡/渐进式破坏Key words
Soil landslide/Run-out process/Material point method/Landfill slope/Progressive failure分类
天文与地球科学引用本文复制引用
张巍,史卜涛,施斌,张云,吴方东..土质滑坡运动全过程物质点法模拟及其应用[J].工程地质学报,2017,25(3):815-823,9.基金项目
国家自然科学基金重点项目(41230636),江苏省自然科学基金项目(BK20160366),苏州市科技计划项目(SYG201613)资助. （41230636）
