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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。
In this paper, a large-scale direct shear instrument was used to study the interfacial shear properties of HDPE smooth and matte geomembranes (GMs) in dry and wet conditions with non-woven geotextiles (GTs). The test results show that the smooth geomembrane shows the peak intensity at a small shear displacement, whereas the rough geomembrane needs a large shear displacement to achieve the peak intensity. Whether smooth geomembrane, or rough geomembrane, and non-woven geotextile interface has obvious strain softening properties. Rough geomembrane interfacial shear strength higher than the smooth geomembrane, with the same interface, in the wet state, due to the presence of suction, interfacial shear strength higher than the dry state. Through the linear fitting of the interfacial shear strength, the shear strength parameters are obtained. In the stability analysis of the landfill, if the interface is wet, the cohesion is negligible.