Reinforcement strength reduction in FEM for mechanically stabilized earth structures  

作　　者：薛剑峰 陈建峰 

机构地区：[1]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education(Tongji University) [2]School of Applied Science and Engineering, Monash University

出　　处：《Journal of Central South University》2015年第7期2691-2698,共8页中南大学学报（英文版）

基　　金：Project(41072200)supported by the National Natural Science Foundation of China;Project(14PJD032)supported by the Shanghai Pujiang Program,China

摘　　要：The factor of safety of mechanically stabilized earth(MSE) structures can be analyzed either using limit equilibrium method(LEM) or strength reduction method(SRM) in finite element/difference method. In LEM, the strengths of the reinforcement members and soils are reduced with the same factor. While using the SRM, only soil strength is reduced during the calculation of the factor of safety. This causes inconsistence in calculating the factor of safety of the MSE structures. To overcome this, an iteration method is proposed to consider the strength reduction of the reinforcements in SRM. The method is demonstrated by using PLAXIS, a finite element software. The results show that the factor of safety converges after a few iterations. The reduction of strength has different effects on the factor of safety depending on the properties of the reinforcements and the soil, and failure modes.The factor of safety of mechanically stabilized earth（MSE） structures can be analyzed either using limit equilibrium method（LEM） or strength reduction method（SRM） in finite element/difference method. In LEM, the strengths of the reinforcement members and soils are reduced with the same factor. While using the SRM, only soil strength is reduced during the calculation of the factor of safety. This causes inconsistence in calculating the factor of safety of the MSE structures. To overcome this, an iteration method is proposed to consider the strength reduction of the reinforcements in SRM. The method is demonstrated by using PLAXIS, a finite element software. The results show that the factor of safety converges after a few iterations. The reduction of strength has different effects on the factor of safety depending on the properties of the reinforcements and the soil, and failure modes.

关 键 词：mechanically stabilized earth structures factor of safety strength reduction method iterative method 

分 类 号：TU43[建筑科学—岩土工程]