填埋场渗漏检测高压直流电法的正演解析

针对填埋场渗漏检测高压直流电法的传统理论模型在解析膜下介质中的电势分布规律时存在的问题，提出了将单衬层填埋场看作水平方向为无穷大的三层均匀介质，漏洞电流视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的叠加的理论模型，对模型中各层介质的电势分布规律进行了正演解析。通过对模型解析结果的计算机模拟和中试填埋场膜上、膜下的试验比较，结果表明，模型计算的理论值与实测值吻合较好。

Analytical model for landfill high voltage DC leak detectio

To solve the disability of conventional model used in electrical leak location when measurement electrodes are buried under the liner,a new model of high voltage DC leak detection is proposed.For single-liner landfill,the waste material,the liner,and the soil under the liner are simulated by infinite horizontal layers.The leak current is regarded as two parts in which one is negative current source at the entrance,and the other is positive current source with the same size at the exit.The distribution of the electrical potential in every liner is deduced based on this model.To identify the validity of the model in locating leaks in geomembrane liner,pole-dipole experiments above the liner and fixed electrodes experiments under the liner are carried out at a medium scale geomembrane lined facility.The agreement is excellent between the experimental data and the calculated model value,which validates the availability of the model to predict leaks in geomembrane liner.