高密度电阻率成像技术在既有线铁路路基病害探测中的应用

Application of High Density Resistivity Tomography to Prospecting Diseases of Existing Railway Bed

用重庆奔腾数控技术研究所的WDZJ-3型高密度电法仪,采集了既有线沪昆铁路某段+000～+450的温纳装置视电阻率数据。对采集的资料用RES2DINV软件进行了反演,结合地质情况对既有线地下不良地质病害进行了解释推断,结果表明岩溶洞穴的电阻率与围岩的电阻率有明显差异,在视电阻率等值线断面图和反演成像图中表现为低阻异常区,据此圈定了地下溶洞的埋深、大小与规模,取得了良好的地质效果。高密度电阻率法具有工作效率高、采集数据稳定可靠,成像图件直观清晰等优点。理论和实践表明,高密度电法在既有线铁路路基地质病害探查有较大优点,可推广应用。

With the WDZJ--3 high density electrical device developed by Chongqing Benteng Digital Control Technical Institute, we collected apparent resistivity data of Wenner type in the range of ＋000-＋450 of the existing Shanghai- Kunming Railway. The collected data are inversed by using RES2DINV software. Combined with the geological conditions, the underground geological diseases are interpreted. The results show that there exists obvious differences between the resistivity of background rock and caves which are corresponding to low resistivity anomalies in the apparent resistivity contour map and the inversion imaging. The depth, size and scale of the underground caves are outlined. High density resistivity tomography is efficient. The collected data are stable and reliable, and the image is easy for interpretation which indicates that high density resistivity tomography has a great advantage in terms of exploration of geological diseases in the existing railway line.