垃圾填埋场边坡上土工膜的受力分析  

Analysis of tension of geomembranes placed on landfill slopes

作　　者：冯世进[1] 高丽亚[2] 王印[1] 

机构地区：[1]同济大学地下建筑与工程系 [2]同济大学同科学院,上海200070

出　　处：《岩土工程学报》2008年第10期1484-1489,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50708079);教育部博士点基金新教师基金项目(20070247041);上海市晨光计划项目(2007CG23);光大环保创新基金项目;中国科学院岩土力学重点实验室开放基金项目(Z110604)

摘　　要：在垃圾填埋场中,土工膜可以隔离垃圾体与周围环境,避免地下水受到污染。在土工膜上填埋垃圾和土层,沿其长度方向将有剪应力作用,使得土工膜发生变形,内部产生拉力,为保证土工膜的安全使用,需要对土工膜的拉力进行分析。将土工膜与黏土界面的剪应力–位移关系曲线分为弹性、软化和残余强度3阶段,采用三阶段弹塑性模型来描述土工膜与黏土界面的剪切变形特性,推导出了界面处于弹性、软化和残余强度3阶段时土工膜位移–拉力的微分控制方程,由于3个阶段分界点的位置是未知的,利用迭代法求解土工膜的拉力,分析了填埋高度和坡度的变化对土工膜拉力的影响。In engineering projects of landfills, geomembranes were commonly used to isolate waste from the surrounding ground and groundwater in order to minimize the potential groundwater contamination. Subsequent construction of a landfill included the placement of waste layers and soil covers at various heights over the liners. Substantial down-slope shear stresses might be resulted in the geomembrancs, leading to the development of significant gcomcmbranc tension which was necessary to be studied so as to ensure the safe use. The relationship between shear stress and displacement for interface between the geomembranes and the clay was divided into three states： elastic, softening and residual strength. Three-state elasto-plastic model was presented to simulate the shear deformation property for the interface, and the governing differential equations of three states were obtained. Because the demarcation points among the three states were unknown, the iterative computation method should be used to compute the tension of geomembranes. Finally, some important factors, including the influence of landfill height and slope gradient on the tension of geomembrancs, were studied.

关 键 词：土工膜 接触面 弹塑性模型 软化 拉力 残余强度 

分 类 号：TU411.3[建筑科学—岩土工程]