摘要
该文采用大尺寸直剪仪,研究填埋场复合衬垫系统中,HDPE光面和糙面土工膜(GMs),在干燥、潮湿状态下与无纺土工布(GTs)界面剪切性能。试验结果表明,光面土工膜在较小的剪切位移即出现峰值强度,而糙面土工膜需要较大剪切位移才能出现峰值强度。不管是光面土工膜,还是糙面土工膜,与无纺土工布界面均具有明显的应变软化特性。糙面土工膜界面剪切强度比光面土工膜高,同一种界面,在潮湿状态下,由于吸力的存在,界面剪切强度比干燥状态下高。通过对界面剪切强度进行线性拟合,得出剪切强度参数,提出填埋场稳定性分析中,如果界面处于潮湿状态下,粘聚力可忽略不计。
This paper presents the interface shear properties between smooth and textured HDPE geomembranes（GMs） with geotextiles（GTs） by a large size direct shear test in dry and wet conditions,which are parts of the composite liner system of landfill.Experimental results show that the peak shear stresses occur at small displacements for smooth GMs with GTs while textured GMs with GTs need large displacements to reach the peak shear stresses.The strain softening behaviour is evident at the interfaces of both smooth GMs and textured GMs with GTs.The shear strength of textured GMs are higher than that of smooth GMs.Due to the suction effect between the GM-GT interfaces,in the wet condition displayed higher peak stresses than those corresponding to dry condition.The interface shear strength parameters are obtained by a straight line approximation.It is proposed that the cohesion parameter could be ignored in the landfill stability analysis if the interface in wet conditions.
出处
《工程力学》
EI
CSCD
北大核心
2010年第12期186-191,共6页
Engineering Mechanics
基金
福建省青年基金项目(2009J05126)
厦门市科技局项目(3502Z20083042)
关键词
大尺寸直剪实验
复合衬垫系统
HDPE土工膜
土工布
剪切强度
应变软化
large size direct shear test
composite liner system
HDPE geomembrane
geotextile
shear strength
strain softening behaviour
