等值反磁通瞬变电磁法在城市生活垃圾填埋场渗漏检测中的应用

Application of Opposing Coils Transient Electromagnetic Method in Leakage Detection of Urban Domestic Waste Landfills

长期工作的城市生活垃圾填埋场,易发生垃圾堆体下部底膜破损渗漏情况,常规的物探检测方法不仅受场地和探测深度等局限性影响,还会对表层的雨污分流膜造成一定的破坏,且上部较厚的垃圾堆体往往还会形成低阻屏蔽,难以有效应用于城市生活垃圾填埋场的渗漏检测之中。在不破坏生活垃圾填埋场表层雨污分流膜的情况下,等值反磁通瞬变电磁法(Opposing Coils Transient Electromagnetic Method,OCTEM)能穿透低阻覆盖层,准确、快速、有效地探测出垃圾堆体下部底膜的破损渗漏情况,实现真正的无损检测。本次研究采用OCTEM对龙山县城市生活垃圾填埋场物探检测异常进行开挖验证,结果显示,防渗膜接缝处有多条裂缝和漏洞,最长的裂缝长度接近1 m,最大的漏洞直径大于30 cm,证实了OCTEM推测的渗漏异常与开挖情况吻合较好,有力地说明了OCTEM在城市生活垃圾填埋场渗漏检测中是一种行之有效的无损检测手段。

The domestic waste landfill that has been working for a long time is prone to damage and leakage of the bottom film in the garbage dump body.Without damaging the rainwater and sewage separation membrane on the surface of the domestic waste landfill site,the equivalent anti magnetic flux transient electromagnetic method can penetrate the low resistance cover layer,and detect the damage and leakage of the bottom membrane under the garbage heap accurately,quickly,and effectively,achieving true non-destructive testing.In this study,OCTEM was used to verify the excavation of geophysical anomalies in the urban domestic waste landfill site in Longshan county.The results showed that there were multiple cracks and loopholes at the joint of the anti-seepage membrane,with the longest crack being nearly 1 meter long and the largest loophole having a diameter greater than 30 centimeters.This confirmed that OCTEM's speculated leakage anomalies were in good agreement with the excavation situation,This strongly demonstrates that OCTEM is an effective non-destructive testing method for leakage detection in urban domestic waste landfills.