Analysis on advanced transient EM detectability of coal mine roadway  

作　　者：LING Hong LIU Yunhe MA Xinpeng 

机构地区：[1]College of Geo-Exploration Science and Technology,Jilin University,Changchun 130026,China

出　　处：《Global Geology》2023年第3期177-188,共12页世界地质（英文版）

摘　　要：The hidden water-bearing structures near the roadway tunnelling face are very likely to cause water seepage accidents in coal mines.Currently,transient electromagnetic(EM)technology has be-come an important method to detect water damage in advance of roadway excavation.In this paper,the time-domain finite element algorithm based on unstructured tetrahedron grids is used to accurate-ly simulate the geological body in front of the roadway excavation face and analyze its response.The authors detect the distance between the roadway excavation face and the low-resistivity water-bearing body,the resistivity difference between the low-resistivity body and surrounding rock,and the influence of the size of the low-resistivity body on the transient EM response.Furthermore,the common types of low-resistivity bodies in the roadway drivage process are used for modeling to analyze the attenuation of the detected EM response when there are low-resistivity bodies in front of the roadway.The research in this paper can help effectively detecting the water-bearing low-resistivity body in front of the roadway drivage and lay a foundation for reducing the risk of water seepage accidents.

关 键 词：coal mine roadway transient EM time-domain finite-element advanced detection 

分 类 号：P631.325[天文地球—地质矿产勘探] TD745[天文地球—地质学]