Abstract The dynamic shear behavior of composite liner interface is of great importance for landfill seismic analysis. In this study, an experimental investigation of the shear behavior of the interface between smooth high density polyethylene (HDPE) geomembrane (GMB) and compacted clay liner (CCL) is presented. A series of displacement-controlled cyclic shear tests were conducted to investigate the effects of displacement amplitudes, normal stress levels and number of cycles on the GMB/CCL interface shear behavior. Cyclic loading with higher displacement amplitude will produce greater vertical contraction and lower interface initial shear stiffness. Also, significant shear strength degradation was observed within the first 5 shearing cycles, then followed by slight interface reinforcement in subsequent cycles. The dynamic shear modulus of GMB/CCL interface is dependent on both normal stress levels and displacement amplitudes, while the damping ratio is only affected by displacement amplitudes. Finally, a method considering the GMB/CCL composite liner as an equivalent soil layer was proposed, which is useful for landfill seismic analysis.

中文翻译：

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循环荷载作用下GMB/CCL界面的动态剪切行为

摘要 复合衬砌界面的动力剪切行为对于垃圾填埋场的地震分析具有重要意义。在这项研究中，对光滑高密度聚乙烯 (HDPE) 土工膜 (GMB) 和压实粘土衬垫 (CCL) 之间界面的剪切行为进行了实验研究。进行了一系列位移控制循环剪切试验，以研究位移幅度、法向应力水平和循环次数对 GMB/CCL 界面剪切行为的影响。具有较高位移幅度的循环加载将产生较大的垂直收缩和较低的界面初始剪切刚度。此外，在前 5 个剪切循环中观察到显着的剪切强度降低，然后在随后的循环中出现轻微的界面增强。GMB/CCL 界面的动态剪切模量取决于法向应力水平和位移幅值，而阻尼比仅受位移幅值影响。最后，提出了一种将GMB/CCL复合衬垫作为等效土层的方法，该方法有助于垃圾填埋场地震分析。