A Case Study To Detect the Leakage of Underground Pressureless Cement Sewage Water Pipe Using GPR, Electrical, and Chemical Data

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• 作者：Guanqun Liu ; Yonggang Jia ; Hongjun Liu ; Hanxue Qiu ; Dongling Qiu ; and Hongxian Shan
• 刊名：Environmental Science & Technology
• 出版年：2002
• 出版时间：March 1, 2002
• 年：2002
• 卷：36
• 期：5
• 页码：1077 - 1085
• 全文大小：178K
• 年卷期：v.36,no.5(March 1, 2002)
• ISSN：1520-5851

文摘

The exploration and determination of leakage of undergroundpressureless nonmetallic pipes is difficult to deal with.A comprehensive method combining Ground PenetratingRader (GPR), electric potential survey and geochemical surveyis introduced in the leakage detection of an undergroundpressureless nonmetallic sewage pipe in this paper.Theoretically, in the influencing scope of a leakage spot,the obvious changes of the electromagnetic properties andthe physical-chemical properties of the undergroundmedia will be reflected as anomalies in GPR and electricalsurvey plots. The advantages of GPR and electricalsurvey are fast and accurate in detection of anomalyscope. In-situ analysis of the geophysical surveys can guidethe geochemical survey. Then water and soil samplingand analyzing can be the evidence for judging the anomalyis caused by pipe leakage or not. On the basis of previoustests and practical surveys, the GPR waveforms, electricpotential curves, contour maps, and chemical survey resultsare all classified into three types according to the extentor indexes of anomalies in order to find out the leakage spots.When three survey methods all show their anomalies astype I in an anomalous spot, this spot is suspected as themost possible leakage location. Otherwise, it will bedown grade suspected point. The suspect leakage spotsshould be confirmed by referring the site conditions becausesome anomalies are caused other factors. The excavationafterward proved that the method for determining thesuspected location by anomaly type is effective and economic.Comprehensive method of GRP, electric potential survey,and geochemical survey is one of the effective methods inthe leakage detection of underground nonmetallicpressureless pipe with its advantages of being fast andaccurate.