Model Test and Numerical Analysis on Long-Term Mechanical Properties of Stepped Reinforced Retaining Wall  

作　　者：WANG Chengzhi LUAN Maotian ZHU Zeqi 汪承志;栾茂田;朱泽奇(School of Civil Engineering,Dalian University of Technology,Dalian 116024,China;School of River and Ocean Engineering Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]School of Civil Engineering,Dalian University of Technology,Dalian 116024,China [2]School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China [3]State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China

出　　处：《Transactions of Tianjin University》2012年第1期62-68,共7页天津大学学报（英文版）

基　　金：Supported by National Natural Science Foundation of China (No. 50678032 and No. 90715042);Key Project of Ministry of Education of China (No. 210176)

摘　　要：Model tests and numerical analyses of stepped reinforced retaining wall were performed to investigate the effects of rheology of backfill and creep of geogrids on the long-term performance of the structure.The geogrid tensions,soil pressures,wall deformations and foundation pressure were measured during model construction and loading.A visco-elasto-plastic model and an empirical nonlinear visco-elastic model were utilized to simulate the stresses and deformations of geogrid-reinforced earth-retaining wall under long-term loads.By comparing test data with numerical results,it is shown that the foundation pressure distribution is nonlinear,and the lateral constraint of geogrids for backfill can cause a redistribution of foundation pressure.The curve of soil pressure is outside convex at each step initially,and it is close to the distribution for the case of vertical wall subsequently.The variation trend of geogrid tensions at different heights is obtained.Moreover,the failure mechanism and development mode of potential slip surface in retaining wall are proposed.Model tests and numerical analyses of stepped reinforced retaining wall were performed to investigate the effects of rheology of backfill and creep of geogrids on the long-term performance of the structure. The geogrid tensions, soil pressures, wall deformations and foundation pressure were measured during model construction and loading. A visco-elasto-plastic model and an empirical nonlinear visco-elastic model were utilized to simulate the stresses and deformations of geogrid-reinforced earth-retaining wall under long-term loads. By comparing test data with numerical results, it is shown that the foundation pressure distribution is nonlinear, and the lateral constraint of geogrids for backfill can cause a redistribution of foundation pressure. The curve of soil pressure is outside convex at each step initially, and it is close to the distribution for the case of vertical wall subsequently. The variation trend of geogrid tensions at different heights is obtained. Moreover, the failure mechanism and development mode of potential slip surface in retaining wall are proposed.

关 键 词：model test GEOGRID stepped reintbrced retaining wall finite element method visco-elasto-plasticity model 

分 类 号：TU476.4[建筑科学—结构工程] O241[建筑科学—土工工程]