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针对填埋场衬垫系统薄弱界面容易失稳,基于前期已完成的高密度聚乙烯(HDPE)加肋土工膜与砂性土界面直剪试验,以及结合试验结果对界面剪切特性及试样破坏形态分析的基础上,探讨了加肋土工膜与砂性土界面相互作用机制,给出了加肋土工膜与砂性土界面总阻力由面摩阻力、肋块所受端承阻力和侧摩阻力3部分组成的具体表达式,其中,肋块所受端承阻力是基于塑性滑移场理论建立起来的。同时,认为肋块端承阻力是提高加肋土工膜与砂性土界面剪切强度的主要原因,尤其在较高法向应力下,肋块端承阻力更能得到充分发挥。理论分析与试验结果较为吻合,该表达式能合理反映加肋土工膜与砂性土界面的总阻力。
Based on the direct shear test of HDPE ribbed geomembrane and sand soil interface which was completed in the earlier stage and the combination of test results on the shear characteristics of interface and specimen Based on the morphological analysis, the mechanism of the interaction between the ribbed geomembrane and the sandy soil is discussed. The total resistance of the ribbed geomembrane to the sandy soil is given by the resistance of the skin friction, The friction resistance is composed of three parts, of which the resistance of the rib to the bearing is established based on the plastic sliding field theory. At the same time, it is considered that the resistance of ribbed end bearing is the main reason to increase the interfacial shear strength between ribbed geomembrane and sandy soil, especially under high normal stress, the resistance of ribbed end bearing can be fully exerted. The theoretical analysis and experimental results are in good agreement. The expression can reasonably reflect the total resistance of the ribbed geomembrane and sandy soil interface.