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《Engineering Journal of Wuhan University》 2010-01
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Effect of dry density on pull-out behaviors of interface between geogrids and compacted expansive soils

WANG Mingyuan1,2,LI Qiren3,SHI Geliang2(1.HydroChina Huadong Engineering Corporation,Hangzhou 310014,China;2.Key Lab.of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan 430010,China;3.China Railway Southwest Research Institute Co.,Ltd.,Chengdu 610031,China)  
A filling with dimension of 600 mm×600 mm×600 mm laminated shear test apparatus is adopted to carry out a series of pull-out tests,with HDPE uniaxial geogrid and PET biaxial geogrid,and the weathered expansive marlite in Xinxiang,the middle route of the South-to-North Water Transfer Project(SNWTP),to investigate effect of dry density on behaviors of the interface between geogrids and compacted expansive soils.The results show that,with higher dry density,the pull-out force increases when the velocity of geogrid's rigid movement increases,and the peak pull-out force and the deformation of geogrid develops greater.Curve of interface friction and relative displacement tends to be elastoplastic behavior with high dry density;and the interface rigidity is smaller.The dry density has a significant effect on the interface quasi-friction angle,but unconspicuous effect on the quasi-cohesion.
【Fund】: 国家“十一五”科技支撑计划重大项目(编号:2006BAB04A10)
【CateGory Index】: TV221.2
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