Study on Interface Shear Characteristics of Soil-Composite Geomembrane under Constant Normal Stiffness

在实际工程中，复合土工合成材料因其出色的力学性能和广泛的应用场景而得到日益广泛的应用。在常见的恒法向应力边界条件上进行改进，选取更能体现实际工况的恒法向刚度边界条件，从温度、含水率、法向应力、法向刚度方向研究土–复合土工膜界面的力学特性对全方位把握其界面有重要意义。结果表明，温度对界面剪切强度影响较大，含水率对界面的影响与温度密切相关。法向应力在常温和负温下界面剪切应力的增长速率较为稳定，而随着法向刚度的增大界面剪切强度也增大，且随着温度降低变化量也增大。Composite geosynthetic materials are more and more used in practical engineering because of their excellent mechanical properties and wide application scenarios. By improving the common constant normal stress boundary conditions and selecting the constant normal stiffness boundary conditions that can better reflect the actual working conditions, it is of great significance to study the mechanical characteristics of the soil-composite geomembrane interface from the directions of temperature, water content, normal stress and normal stiffness. Results show that the influence of surface temperature on interfacial shear strength was great, and the influence of water content on interfacial shear strength is closely related to temperature. The growth rate of interfacial shear stress at normal temperature and negative temperature is relatively stable, and the interfacial shear strength also increases with the increase of normal stiffness, and the change amount also increases with the decrease in temperature.