垃圾填埋场斜坡上土工合成材料受力分析

为了评价垃圾填埋场防渗系统材料界面之间的摩擦特性以及土工合成材料端部的应力，进行了模拟试验和有限元分析。采用直接剪切试验，获得了土与短纤维无纺布、短纤维无纺布与HDPE土工膜以及短纤维无纺布与TPO（PE）界面的摩擦角和黏聚力；采用离心模拟试验，得到了伴随土压缩引起的短纤维无纺布和土工膜端部拉应力。试验结果表明：材料界面之间的摩擦角较大，但黏聚力不大；伴随填埋高度的增加，短纤维无纺布和土工膜端部的拉应力也随之增大。运用有限元对土压缩引起的短纤维无纺布和土工膜端部拉应力以及界面的摩擦应力分布进行了分析，并与试验结果进行了对比，分析结果表明：两者基本一致，碾压机械下方土工膜界面之间摩擦应力比较大。

Analysis of tensile force of geosynthetics placed on side slope in waste landfill

To evaluate interface friction characteristics and tensile force of geosynthetics, the simulation experiments and analysis are conducted. Firstly, the friction angle and adhesion were obtained between non-woven staple geotextile and soil, HDPE geomembrane, TPO(PE) geomembrane by direct shear experiments. Secondly, the tensile forces at the fixed ends are measured by the centrifugal modeled tests due to compaction work of soil. Test results show that the friction angle is large, and adhesion is small between materials; The tensile forces at the fixed ends become larger with the increase of the height of soil. Based on the interface characteristics, the distribution of friction stress on the interface and the tensile forces of non-woven staple geotextile and HDPE geomembrane or TPO(PE) geomembrane are analyzed by FEM. the calculation results of tensile forces are compared with the centrifugal model experiment results; the calculation values are as similar as experimental values; and the friction stress on the interface under bulldozer is large.