单合成衬层填埋场渗漏检测的多介质模型  

Multimedia model of single-liner landfill high voltage DC leak detection.

作　　者：杨萍[1] 董路[2] 王琪[2] 

机构地区：[1]北京联合大学信息学院,北京100101 [2]中国环境科学研究院固体废物污染控制技术研究所,北京100012

出　　处：《中国环境科学》2008年第1期63-67,共5页China Environmental Science

基　　金：国家“863”项目(2001AA644010)

摘　　要：建立了填埋场渗漏检测高压直流电法模型,将单衬层填埋场看作水平方向为无穷大的3层均匀介质,上层为垃圾层,中间层为人工合成衬层,下层为土壤层;漏洞电流视为电流流入端的负电流源和电流流出端的正电流源;介质中任意检测点的感应电势是膜上漏洞面电流源和膜下漏洞面电流源以及膜上供电电极电流源在该点感应电势的叠加.漏洞电流与供电回路电流之间的关系分析表明,流经漏洞的电流(I0)占总电流(Is)的比例(f0)随着填埋场底部面积的增加而减小,当填埋场底部面积≤3600m2时,I0占Is的90%以上,而当场底面积增为105m2时,I0仅占Is的55%.根据独立作用原理,分析了多漏洞情况下各层介质中的电势分布并进行了试验验证.The multimedia model of single-liner landfill high voltage DC leak detection was developed. For single-liner landfill, the waste material, the liner, and the soil under the liner were simulated by infinite horizontal layers. And the leak current was regard as a negative current resource at the entrance and a positive one of the same size at the exit. The primary potential associated with a leak-free liner was added to the secondary potential associated with the leak current to form the integral equation above or below the liner and the general expression for the current density at the boundary between the waste material and the liner were derived. The relationship between the fraction of leak current I0 to total current Is and the surface area of landfill was analysed, the relative amount of source current flowing through the leak decreased as the size of the geomembrane liner increased. For a waste landfill having a surface area of 3,600 m^2（r =60m）, 90 percent of the source Current flowed through the leak; but for a landfill had 10^5m^2 surface area （r =178m）, only 55 percent of the source current flowed through the leak. To identify the validity of the model to locate the leaks in geomembrane liner, pole-dipole experiments above the liner and fixed electrodes experiments under the liner were carried out at a medium scale geomembrane lined facility. The agreement was satisfactory between the experimental data and the calculated model value, which validated that it was practical to predict leaks in geomembrane liner with the model.

关 键 词：填埋场 渗漏检测 高压直流电法 模型 

分 类 号：X705[环境科学与工程—环境工程]