含水率对经编土工格栅与土界面作用特性的影响  

The influence of water content to interaction characteristics between warp knitting geo-grids and soil

作　　者：张文慧[1] 王保田[1] 张福海[1] 李守德[1] 

机构地区：[1]河海大学岩土工程水利部重点实验室

出　　处：《中南公路工程》2007年第3期24-26,41,共4页Central South Highway Engineering

基　　金：江西省水利科技项目(200507)

摘　　要：加筋土工程中,加筋与填土间的界面作用特性是最关键的技术指标,直接决定工程的稳定性,而土体含水率的变化会影响加筋与填土间的界面作用特性。通过室内拉拔试验研究了不同含水率条件下经编土工格栅与土体间的界面作用特性,试验结果表明:在相同的法向应力下,土工格栅被拔出破坏时对应的极限表观摩擦阻力随着土体含水率的增加而降低;不论土工格栅是整体被拔出破坏还是纵肋被拔出破坏,土工格栅和土体界面间的表观摩擦角和表观粘着力均随着土体含水率的增加而降低;土工格栅与土体界面间的破坏形式由土工格栅的整体被拔出破坏转变为纵肋被拔出破坏时对应的法向应力随着土体含水率的增加而增大。The interaction characteristics between reinforcements and soil are the key index in reinforced earth, which determines the stability of reinforced earth, and the change of water content of soil has great influence on the interaction characteristics between reinforcements and soil. Pullout test has been done in laboratory to study the influence of water content to interaction characteristics between warp knitting geo-grids and soil. Test results show that the quantity of apparent frictional resistance between geo-grid and soil is decreases as the water content of the soil increasing when the normal stress keeps invariable, the apparent cohesion and apparent friction angle are both decrease as the water content increasing whether the failure format between warp knitting geo-grids and soil is the geo-grids pulled out or longitudinal gill pulled out, and the range of the normal stress within which the failure format between warp knitting geo-grids and soil changes from the entirety warp knitting geo-grids pulled out to longitudinal gill pulled out is increases as the water content increasing.

关 键 词：含水率 经编土工格栅 拉拔试验 表观摩擦阻力 表观粘着力 表观摩擦角 

分 类 号：U416.03[交通运输工程—道路与铁道工程]