土工膜防渗层偶极子法渗漏检测电势分布特征及应用

Characteristics and Application of Potential Distribution in Leakage Detection of Geomembrane Anti⁃seepage Layer by Dipole Method

垃圾填埋场土工膜防渗层铺设的完整性是影响防渗效果的关键指标。采用不同地电模型对高压直流电场作用下填埋场土工膜防渗层的电势场及电势差分布进行数值仿真分析,并与模型试验结果进行比对,研究土工膜渗漏点处电势及电势差的分布特征;通过设置不同的试验条件对漏洞处电势差分布的影响因素进行研究,提出了基于渗漏点电学特征的偶极子法检测渗漏点判定方法,并在某生活垃圾填埋场防渗膜施工完成后的渗漏检测中进行了应用。

The integrity of the geomembrane anti⁃seepage layer in waste landfills is the key index affecting the anti⁃seepage effect.The electrical potential field and electrical potential difference distribution of the geomembrane anti⁃seepage layer in landfills under high⁃voltage direct current electric fields were simulated by using different geoelectric models and compared with the results of the model test.The distribution characteristics of electrical potential and electrical potential difference at the leakage point of the geomembrane were studied.By setting different model testing conditions,the influencing factors of electrical potential difference distribution at the leakage point were studied.A clear dipole method based on the electrical characteristics of the leakage point was proposed to detect the leakage point.The method has been applied to leakage detection after the construction of the anti⁃seepage membrane in a domestic waste landfill.