利用综合物探方法确定竖井岩溶发育情况的应用分析

Application and Analysis of Determining Karst Development in Shaft by Comprehensive Geophysical Prospecting Method

在喀斯特地貌分布地区,岩溶较为发育,给工程建设比如道路的建设、水库大坝建设等带来较大的安全隐患。本文根据地下岩溶的电性特征,选择高密度电阻率法和音频大地电磁法(EH4)两种物探方法,在拟施工竖井附近开展地球物理勘查工作,大致探明施工孔(竖井)位及附近地下岩溶、构造断裂破碎带等情况。同时结合实地钻孔资料对勘探结果进行有效验证,证明综合物探方法在岩溶勘查中取得较好的效果,为后期进行竖井施工提供的指导性的基础资料。

In the karst geomorphological distribution area, karst is relatively developed, which brings great potential safety hazards to engineering construction, such as road construction, reservoir dam construction and so on. According to the electrical characteristics of underground karst, this paper chooses two geophysical methods, high density resistivity method and audio-frequency magnetotelluric method (EH4), to carry out geophysical prospecting near the proposed construction shaft, and roughly explores the location of the construction hole (shaft), underground karst and structural fracture zone nearby. At the same time, combined with field drilling data, the exploration results are validated effectively, which proves that comprehensive geophysical prospecting method achieves good results in Karst exploration, and provides guiding basic information for later shaft construction.