综合物探方法在太原市蒙山采空区探测中的应用

THE APPLICATION OF THE INTEGRATED GEOPHYSICAL METHOD TO THE SURVEY OF THE MENGSHAN MINED-OUT AREA OF TAIYUAN

针对太原市蒙山煤矿采空区地形起伏较大、需弯线测量等因素制约的特殊场地条件,提出了阵列形式观测的高密度电阻率法和单点测量方式的瞬变电磁法相结合的综合物探方法。前者二维异常反演分辨率较高,可弥补瞬变电磁法浅部探测盲区,后者具有探测深度大的优势,采用一维异常反演方式可弥补高密度电阻率法受剖面折线展布和地形起伏影响的缺点。由此查明了该矿区采空区的位置及分布情况,后期钻探验证表明所采用的综合物探方法是行之有效的。该综合物探方法组合模式实现了两种物探方法的优势互补,可为同类场地条件下探测煤层采空区提供有意义的借鉴。

In view of the special site conditions of the Mengshan mined-out area in Taiyuan City, i. e. , the considerable terrain fluctuation and the need of curved line measurement, the authors propose the integrated geophysical methods that combine the array-form measurement of high-density resistivity method with the single-point measurement of Transient Electomagnetic Method （TEM）. The former has relatively high resolution for two-dimensional anomaly inversion, which can remedy the shallow survey blind area of the transient electromagnetic method, whereas the latter has the advantage of detecting greater depth and, by adopting the one-dimensional inversion method, it can make up for the defects of the high-density resistivity method caused by the spread of the section broken line and terrain fluctuation, thus realizing the complementary advantages of the two kinds of geophysical methods. With the integrated geophysical methods, the location and the distribution of the mined-out area are detected, and later drilling verified that the integrated geophysical methods are effective. The combination pattern of integrated geophysical methods provides a meaningful reference for detecting other mined-out areas with similar conditions.