针对填埋场防渗膜(高密度聚乙烯,缩写为HDPE)膜上介质含水率不同的特点,提出利用磁法检测填埋场渗漏(简称磁法测漏).通过修正高压直流电法渗漏检测模型,定性分析了填埋场防渗膜漏洞附近磁场的分布情况.结果表明:当检测区域背景磁感应强度波动小于0.5 nT时,利用磁法检测填埋场渗漏有效可行；但当检测区域背景磁感应强度波动大于0.5 nT时,磁法测漏须通过比较固定点处供电电源在通、断电情况下的磁感应强度差异来判断,这在大面积范围内的工程上较难实现,仅可用于局部防渗膜的漏洞检测；由于影响磁场分布的因素较多,提高磁法测漏的抗干扰能力仍需进一步研究.%Based on the difference in the moisture in (he medium above HDPE (high-density polyethylene) , a new way of detecting the landfill leakage, named the magnetic method, is introduced in this paper. The distribution of the magnetic field near the leakage of HOPE was studied by modifying the traditional high voltage direct current method. Field experimental data showed that the magnetic method is effective for detecting the leakage of HDPE when the change of the background magnetic field is less than 0. 5 Nt. However, when the change of the background magnetic field is more than 0. 5 Nt, the change of the magnetic field of a particular point should be considered when the power is supplied, or else cut off to judge the leakage of HDPE. This is difficult to carry out in a large area, but it can be used for regional area detection.' Furthermore, since many factors affect the distribution of the magnetic field, how to improve the anti-interference performance of the method needs to be studied further.
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