垃圾填埋场边坡上土工膜的拉力与位移分析

在垃圾填埋场中，土工膜通常放在填埋场的边坡上用来隔离有害物质以避免污染周围环境。土工膜上填埋垃圾和土层沿其长度将有剪应力作用，使得土工膜产生位移，内部承受拉力。为保证土工膜的安全使用，需要对土工膜的拉力与位移进行分析。以边坡材料的应力应变协调为基础，对土工膜下层与土接触面上的剪应力-位移关系采用双曲线模型，推导出微分控制方程，并利用有限差分法迭代求解控制方程得到土工膜位移与拉力的解。最后，对影响土工膜拉力和位移的重要参数进行了分析研究。

Analysis of tension and displacement of geomembranes placed on landfill slopes

In landfills, geomembranes are commonly placed on the slopes to isolate waste from the surrounding ground. Placement of soil cover and waste layers over these geomembranes will result the shear stress on the liners and lead to developing significant linear tensions and displacements which are necessary to be studied so as to ensure the safety use. This paper took into account the essential stress-strain compatibility and used the hyperbolic curve to model the interface shear stress-displacement between the lower interface and soil, then got the governing differential equations. The equations were solved numerically using a finite difference combined with iteration method. Finally, the important factors which influence the behavior of the interface between the geomembranes and soil, are studied.