综合物探方法在煤矿采空区积水勘探中的应用

Application of comprehensive geophysical prospecting method in water exploration of mined-out area of coal mine

塔山煤矿开采煤层上下部均有采空区存在,如果采空区积水严重,会导致煤矿生产存在巨大安全隐患。为查明采空区积水的范围和位置,采用瞬变电磁法和高密度电阻率法相结合的综合物探方法开展研究。在已知采空区表面对仪器的观测时窗范围、关断时间、采样延时、发射电流、叠加次数等参数进行测试,采用瞬变电磁法对矿井表面进行大面积勘探,通过综合分析发现疑似采空区积水区,在疑似采空区积水区安排高密度电阻率勘探。结果表明:勘探区存在8个采空区,位于目前开采的8#煤层上方,采用高密度电法和瞬变电磁法的综合地球物理方法,可以准确获得采空区积水区的范围和位置。

Tashan Coal mine is a comprehensive mine,and there are goaf in both the upper and lower parts of coal seam.If the water in the goaf is serious,it will lead to huge safety risks in coal mine production.In order to find out the range and location of the water in the goaf,the comprehensive geophysical method combining transient electromagnetic method and high density resistivity method is used to carry out the research.The observation time window range,turn-off time,sampling delay,emission current,stacking times and other parameters of the instrument were tested on the surface of the known goaf.The transient electromagnetic method was adopted to conduct large-scale exploration on the mine surface,and the suspected water accumulation area of the goaf was found through comprehensive analysis,and high-density resistivity exploration was arranged in the suspected water accumulation area of the goaf.The results show that there are 8 mined-out areas in the exploration area,which are located above No.8 coal seam.The comprehensive geophysical method of high-density electrical method and transient electromagnetic method can be used to accurately obtain the range and location of the water accumulation area in the mined-out area.