Stability analysis method of geogrid reinforced expansive soil slopes and its engineering application  

土工格栅加筋膨胀土边坡稳定性的分析方法及工程应用

作　　者：ZHANG Rui LONG Ming-xu LAN Tian ZHENG Jian-long GEOFF Chao 张锐;龙明旭;兰天;郑健龙;GEOFF Chao(National Engineering Laboratory of Highway Maintenance Technology,Changsha University of Science&Technology,Changsha 410114,China;School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Department of Geotechnical and Earth Resources Engineering,Asian Institute of Technology,Klong Luang,Pathumthani 12120,Thailand)

机构地区：[1]National Engineering Laboratory of Highway Maintenance Technology,Changsha University of Science&Technology,Changsha 410114,China [2]School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China [3]Department of Geotechnical and Earth Resources Engineering,Asian Institute of Technology,Klong Luang,Pathumthani 12120,Thailand

出　　处：《Journal of Central South University》2020年第7期1965-1980,共16页中南大学学报（英文版）

基　　金：Project(51978085)supported by the National Natural Science Foundation of China;Project(201808430102)supported by the China Scholarship Council;Project(JTG-201507)supported by the Highway Industry Standard Compilation Project of Ministry of Transportation,China;Project(kfj180102)supported by the Open Fund of Changsha University of Science&Technology,China。

摘　　要：The traditional stability analysis method of geogrid reinforced slopes does not consider the effect of lateral swelling,so it is not applicable to reinforced expansive soil slopes.This paper reports a new stability analysis method for geogrid reinforced expansive soil slopes.The additional pullout force of the free zone due to the lateral swelling and the anti-pullout safety factor of each geogrid layer were obtained by ensuring the overall stability of the reinforced slope.The optimum design was carried out to treat an expansive soil cut slope in Hubei Province,China,by changing the spacing and length of geogrid reinforcement.Calculation results show that the additional pullout force caused by lateral swelling has a great influence on the anti-pullout stability of geogrids,and the local stability of the reinforced slope will be overestimated if the swelling effect of soil in the free zone is not considered.传统土工格栅加筋边坡稳定性分析方法忽略了侧向膨胀作用对加筋体局部稳定性的影响,并不适用于膨胀土加筋边坡。本文提出了一种土工格栅加筋膨胀土边坡稳定性分析的新方法,在保证加筋边坡整体稳定的前提下,得到了自由区因侧向膨胀而产生的附加拔出力和各土工格栅层的抗拔安全系数。通过改变土工格栅加筋间距和长度,对湖北省某膨胀土路堑边坡进行了优化设计。结果表明,膨胀土侧向膨胀引起的附加拔出力对土工格栅的抗拔稳定性有很大影响,若不考虑自由区土体的膨胀效应,将高估加筋边坡的局部稳定性。

关 键 词：expansive soil lateral swelling pressure geogrid-soil interaction stability analysis engineering application 

分 类 号：TU443[建筑科学—岩土工程]