双衬层填埋场层状介质模型的建立

通过对危险废物填埋场结构及电学特性的分析，将双衬层填埋场看作水平方向为无穷大的5层介质空间. 漏洞电流对周围空间电势分布的影响可等效为位于电流流入端的负电流源和位于电流流出端的正电流源对周围空间电势分布的影响. 并且在对主、次防渗层进行检测的同时，对检测层中的电势分布进行了正演解析. 检测层任意一点的感应电势为HDPE膜两侧供电电极产生的感应电势与漏洞电流产生的感应电势的叠加. 试验结果证明，模型的理论值与试验值基本吻合. 

The Stratified Medium Model for Leakage Detection in Double Liner Landfills

According to the structure of hazardous waste landfills and the high resistivity properties of HDPE liners, a stratified medium model was proposed. Distribution of the electric potential and the effect factors were also detailed. The leak current was regarded as two parts, one of which was the negative current source at the entrance, and the other was the positive current source with thesame size at the exit. The electric potential distribution in the test medium was numerically presented not for primary liner leak location but for secondary liner leak location. The electric potential distribution in the test medium associated with electrodes on both sides of liner and leak current was derived. Excellent agreement between experimental and model data indicates the model was efficient in locating leaks.