基于物质点法模拟分层加筋边坡离心模型试验  

Simulations of centrifugal model tests of layer reinforced slope using material point method

作　　者：郭政豪 费建波 介玉新[1] GUO Zhenghao;FEI Jianbo;JIE Yuxin(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,Guangdong 518060;Key Laboratory of Coastal Urban Resilient Infrastructures(MOE),Shenzhen,Guangdong 518060)

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]深圳大学土木与交通工程学院,广东深圳518060 [3]滨海城市韧性基础设施教育部重点实验室,广东深圳518060

出　　处：《水力发电学报》2022年第3期142-150,共9页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金重大项目(52090081);国家自然科学基金(52008261,52178339)。

摘　　要：加筋土边坡的破坏涉及大变形问题,传统的有限元法由于网格畸变带来的数值问题,难以模拟加筋土边坡的破坏。目前关于加筋土边坡破坏的数值模拟研究比较少。物质点法适合模拟大变形的问题。而如何使用物质点法模拟筋材和土的相互作用是一个挑战。本文借鉴杂交物质点有限元法的思路,编写程序模拟了加筋土边坡破坏的离心模型试验。离心试验加速度增加过程中土工布的最大应变、加筋边坡破坏时的滑动面位置、滑体形状模拟结果与试验结果基本一致,边坡最右侧竖向应力模拟值与理论估计值吻合,较好地模拟了加筋边坡的主要特征,验证了方法的可行性,是使用物质点法模拟加筋土大变形问题的一次成功尝试。It is often difficult to simulate the failure of reinforced slopes using the traditional finite element method due to mesh distortion that may cause numerical problems with large deformation.Few previous numerical simulations of reinforced slope failure can be found in the literature.For large deformation problems,the material point method is generally suitable,but a challenge emerges if it is used to simulate the interaction between geosynthetics and soil.To simulate the centrifugal model tests of reinforced slope failure,this paper develops a new model by applying the hybrid finite element material point method.Using this model,we have obtained simulations that agree with the model tests,such as peak geotextile strain,the position of sliding surfaces,and the shape of sliding bodies.The simulated vertical stress at the right side of the slope is nearly the same as its theoretical estimate and the major failure characteristics are captured,verifying our model and the material point method for large deformation analyses.

关 键 词：加筋土 物质点法 筋材单元 边坡 离心试验 

分 类 号：TU441[建筑科学—岩土工程]