复杂荷载作用下填埋场HDPE土工膜受拉计算

采用FLAC程序对典型荷载作用下城市垃圾填埋场HDPE土工膜的受力状况进行了计算分析。3种荷载条件包括:36 m高垃圾堆体自重荷载(分层填埋);下卧软弱黏土层不均匀沉降引起的荷载;地震引起的动力荷载。计算结果显示:①土工膜内的拉应力随着垃圾土分层填埋、基础不均匀沉降、地震荷载的作用而积累;②基础不均匀沉陷是影响衬垫层土工膜局部拉应力的主要因素;③中等强度水平的地震动输入(例如,峰值加速度为0.25g)可使覆盖层土工膜端部锚固位置拉应力超过极限拉应力。

Calculation of tension in HDPE geotechnical membrane under complicated loads

A finite difference analysis using the computer code FLAC was conducted for a landfill,in order to investigate the tensile stress level of HDPE geotechnical membrane under typical loading conditions in the landfill.The loading conditions considered mere:(1) the deadweight of layer-built waste filled up to 36m;(2) the loads induced by potential differential settlement of base;(3) the dynamic loads caused by earthquake.The main conclusions were that(1) the accumulative tensile stress was developed in HDPE membrane by waste dumping,differential settlement,and earthquake,(2) the remarkable stress in liner HDPE membrane was induced by differential settlement primarily(3) the tensile stress in cover system HDPE membrane was higher than ultimate strength of HDPE geotechnical membrane under motion input with moderate intensity(e.g.peak acceleration was 0.25g).