垃圾填埋场防渗衬垫特性的离心模型试验与数值分析研究  

The Behavior of Liner in Landfill by Centrifuge Model Tests and FEM

作　　者：陈继东[1] 施建勇[1] 彭功勋[1] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098

出　　处：《建筑科学》2011年第1期65-67,60,共4页Building Science

摘　　要：垃圾填埋场中垃圾体和防渗土工膜的受力变形特性是普遍关心的问题,在现场试验尚无法获得满意的监测结果时,利用离心模型试验和有限元数值分析进行探讨性研究也是可以尝试的途径。通过离心模型试验研究和有限元计算,模拟了垃圾填埋场中填埋垃圾大变形条件下土工防渗膜的变形性状,在模型比率80的条件下,可以找到相应的模型材料来模拟实际工程中的土工膜;选用的防渗膜模拟材料和木屑土能较好地模拟垃圾填埋场中材料;邓肯-张模型和Goodman接触面模型能模拟垃圾土和土工膜以及界面的工作状态;土工膜中最大拉应力靠近坡肩,可达到极限抗拉强度的1/1.5倍;考虑到HDPE膜的抗拉安全,最大设计坡长应加以控制。The deformation and stress behavior of geomembrane liner and solid waste in landfill are generally concerned.Field monitoring tests are not satisfied for selected data,centrifugal model test and numerical simulation will be good trial way.By the centrifugal model test and finite element method,large deformation characteristics of solid waste in landfill are simulated,and under the condition of model ratio 80 the geomembrane in landfill engineering can be modeled with corresponding material in test.Duncan-Zhang constitutive model and Goodman interface model could model the situation of solid waste and geomembrane as well as interface.The maximum tensile stress is at the edge of slope and even reached to 67% time of the limit tensile strength of geomembrane.The length of slope in design is controlled in consideration of the safety of geomembrane.

关 键 词：填埋场 离心模型试验 有限元 土工膜 

分 类 号：TU411.4[建筑科学—岩土工程] X705[建筑科学—土工工程]