综合物探方法在采空区探测中的应用

Application of Integrated Geophysical Exploration Method to Exploring Mined-out Area

新建常益长铁路经过地区采金遗留的采空区极为发育,为了排除采空区对高速铁路的安全隐患,须查明铁路基底采空区分布规律、规模、埋深情况,为线路绕避或彻底整治提供充分的地质资料。由于测区内采空区规模、埋深情况各异,地表条件复杂,通过分析,采用激电剖面法、大地电磁法和高密度电法综合物探方法对采空区进行探测,在圈定的采空区异常位置布置钻孔。钻探资料表明,下部有采空区发育,验证了物探结论,表明了采用该综合物探方法进行采空区探测是有效的、可行的。

The goaf left by gold mining in the newly built Changyi-Changsha railway is well developed.In order to eliminate the hidden danger of the goaf tothe high-speed railway,it is necessary to find out the distribution law,scale and buried depth of the goaf in the railway basement,so as to provide sufficient geological information for the roundabout or thorough renovation of the railway line.The scale and depth of the mined-out area are different in the surveyed area,and the surface conditions are complex.After testing and analyzing various geophysical methods,the comprehensive geophysical methods combining IP profile method,magnetotelluric method and high-density resistivity method are used to detect the mined-out area and position the drill holes in the specified abnormal area of the goaf.The drilling data show that there are goaf developments in the lower area,which verifies the geophysical conclusions and proves that the comprehensive geophysical exploration method is effective and feasible for the detection of goaf.