含土工复合排水网衬里的界面剪切特性研究  

Interface shear strength of liners with geocomposite

作　　者：林伟岸[1] 詹良通[1] 陈云敏[1] 王香治[2] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]苏州市环境卫生管理处,江苏苏州215002

出　　处：《岩土工程学报》2010年第5期693-697,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金重点项目(50538080);国家杰出青年科学基金项目(50425825);苏州市科技计划项目(SS0733)

摘　　要：采用大尺寸界面直剪仪对土工复合排水网与粗糙土工膜以及土工织物之间界面力学特性进行试验研究。试验发现,土工网芯较大地影响了含土工复合排水网衬里的界面剪切特性。对于挤压型土工膜/土工复合排水网界面,当正应力大于210 kPa时,土工网芯严重破坏了土工膜粗糙表面,导致其界面强度参数减少,峰值摩擦角从17.4°降低到8.6°。而对于土工织物/土工复合排水网界面,当正应力大于50 kPa时,土工网芯的嵌固作用较大地增加了犁沟分量,使其界面强度参数显著增加,峰值摩擦角从10.6°增加到21.3°。The large direct shear tests on interfaces of geomembranes/geocomposite and geotextile /geocomposite are described.It is found that the presence of drainage nets has an important effect on the shear strength of interfaces with geocomposite.When the normal stress is larger than 210 kPa,the drainage nets severely damage the rough surface of coextruded geomembrane,resulting in a reduction of shear strength parameters,i.e.,the peak friction angle decreases from 17.4° to 8.6°.However,on the geotextile/geocomposite interface,when the normal stress is larger than 50 kPa,the embedment of drainage nets increases the plowing effect,resulting in an increase of shear strength parameters,i.e.,the peak friction angle increases from 10.6° to 21.3°.

关 键 词：土工膜 土工复合排水网 土工织物 土工网芯 大尺寸界面直剪仪 剪切强度 应变软化 

分 类 号：TU41[建筑科学—岩土工程] TU472[建筑科学—土工工程]