基于探地雷达的地下管线管径探测与判识方法

Research on Interpreting the Information of Underground Pipeline's Diameter Detected by GPR

目前,基于探地雷达(GPR)的地下管线信息解译工作仅限于判别管线的位置与埋深的经验定性判断,但对地下管线管径的非接触现场测量与信息判识还缺乏简捷、有效的办法。针对这一情况,本文基于GPR探测地下管线的电磁波反射机理提出了一种非开挖、无扰动的现场探测判识地下管径的新方法,并借助Gpr Max二维时域有限差分法,综合分析了不同埋深、管道材质、管道填充介质、探测频率天线以及探测间距等因素下地下管线管径探测判识新方法的可靠性。最后结合宜兴化工园区地下管线探测工程,检验本文所提新方法取得了良好的探测效果。

Ground Penetrating Radar（ GPR） has been widely used in underground pipeline detecting due to its advantages of convenient,simple operation,anti-interference,and high detection resolution. But the current radar information interpreting methods are mainly artificial empirical recognition approaches based on the underground pipeline＇s GPR detection images. Moreover,the interpretation of pipes diameter information is still lack of effective ways. Based on the mechanism of GPR in detecting underground pipelines,the method of detecting diameters of underground pipelines is put forward. By applying the finite difference time domain method（ FDTD）,a forward model was built up,simultaneously,in which the impacts of buried depth,detecting frequency,pipes material were comprehensively analyzed. Afterwards,in the detecting project of sewage pipe network of Yixing Chemical Industrial Park,by applying the processing of image enhancement,measuring point extraction,curve-fitting,the diameters of the underground pipelines were calculated.