ABSTRACT

The interfacial friction characteristics of composite geomembranes have a significant impact on the stability of engineering structures. To comprehensively analyze the interfacial friction properties of composite geomembranes and cushion materials, the effects of shear material, roughness, shear rate, and test temperature were studied through laboratory direct shear friction tests. The results show the improved interface friction performance of the composite geomembranes and granular material. With the increase in the particle size of the test material, the friction angle of the plastic film surface decreased, and the friction angle of the cloth interface increased. The rougher the mortar surface, the greater the interfacial friction angle. The faster the shear rate, the larger the interfacial friction angle. The higher the test temperature, the smaller the interfacial friction angle. The research results provide a theoretical basis for the design of anti-seepage forms of dam bodies, and serve as a reference for engineering designers in evaluating the stability of dam slopes.

摘要

复合土工膜的界面摩擦特性对工程结构的稳定性有显着影响。为综合分析复合土工膜和垫层材料的界面摩擦性能，通过实验室直接剪切摩擦试验研究了剪切材料、粗糙度、剪切速率和试验温度的影响。结果表明复合土工膜和颗粒材料的界面摩擦性能得到改善。随着试验材料粒径的增大，塑料薄膜表面的摩擦角减小，布界面的摩擦角增大。砂浆表面越粗糙，界面摩擦角越大。剪切速率越快，界面摩擦角越大。测试温度越高，界面摩擦角越小。研究成果为坝体防渗形式的设计提供了理论依据，为工程设计人员评估坝坡稳定性提供了参考。