关于具有多层复合衬里填埋场稳定安全的探讨  

Stability problems for landfills with multilayer geosynthetic liner system

作　　者：钱学德[1,2] 施建勇[2] 

机构地区：[1]密歇根州环境保护厅,密歇根兰辛48913 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098

出　　处：《岩土工程学报》2011年第11期1676-1682,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50879022);江苏省自然科学基金项目(BK2008355)

摘　　要：防止含有多层土工合成材料复合衬里的填埋场的平移破坏是填埋场设计中的最重要问题之一。发生在多层衬里界面上的平移破坏的破坏面可能会在背坡上通过衬里的一个界面,而在底部却通过衬里的另一个界面;具有最小安全系数的衬里最危险界面会随着填埋高度和填埋体形状的变化从一个界面转移到另一个界面。在填埋高度较小时,30 cm的渗滤液水位对稳定分析计算的最危险界面和安全系数都会有较大的影响;但是随着填埋高度的增高,30 cm的渗滤液水位对最危险界面改变的和安全系数降低比例的影响变得越来越小。由于渗滤液水位的升高,不仅会导致安全系数的减小,而且还可能会导致多层衬里的最危险界面从一个界转移到另一个界面。提高设计水平,解决目前我国填埋场在长期运行中的渗滤液水位升高问题,保证填埋场的稳定性,是目前迫切需要重视和解决的问题。To prevent translational failure along the liner system is the most important issue for the modern landfills.The critical liner interface with the minimum factor of safety usually is not located at the same interface at the base and back slope.The critical interface can change from one to another with the waste height.When the waste height is low,the leachate head of 30 cm can make a relatively large effect on both the factor of safety and the critical interface.This effect will decrease with the increase of the waste height.The increase of the leachate head in landfills makes the decrease of the factor of safety rapidly and causes the changes of the critical interface.It is important to maintain the leachate head at a low and safe level and ensure that the minimum factor of safety at the critical interface is always equal to or greater than a targeted value during the filling sequence corresponding to different geometric dimensions of the waste.

关 键 词：填埋场稳定 平移破坏 多层复合衬里 最危险界面 

分 类 号：TU411[建筑科学—岩土工程]