基于EH-4大地电磁法探测导水裂缝带发育高度

Detection on Development Height of Water Flow Crack Zone Based on EH-4 Magnetotelluric Method

在导水裂缝带发育高度探测研究上,针对传统观测技术工程量大、观测期长等问题,在分析传统观测技术及其适用条件基础上,研究采用地面物探技术EH-4大地电磁法,通过探测地下岩层视电阻率及其变化,较快捷地测定了泰安煤矿6103工作面开采覆岩视电阻率变化特征,确定了该工作面导水裂缝带最大发育高度为63.4 m,马鞍形平底高度为58.9 m。实践证明采用EH-4大地电磁法能有效探测煤层采后导水裂缝带发育形态及其发育高度。

Based on the study on the detection of development height of the water flow crack zone, according to the traditional observation technology with high engineering quantity, long observation period and other problems, based on the analysis on the traditional observation technology and the suitability conditions, the EH-4 magnetotelluric method of the surface physical exploration technology was applied to the study. With the detection of the electric resistance rate and the variation in the underground strata, the electric resistance rate variation features of the overburden strata above the No. 6103 coal mining face in Tai＇an Mine could be rapidly measured. The max development height of the water flow crack zone determined in the coal mining face was 63.4 m and the saddle type fiat floor height was 58.9 m. the practices showed that the EH-4 magnetotelluric method applied could effectively detect the development pattern and the development height of the water flow crack zone after the seam mining completed.