大倾角多煤层采空区的探测研究

Detection Research on Steeply Dipping Multiple Coal Seams Worked-out Area

针对鹤岗矿区大倾角多煤层采空的实际情况,在充分进行地质调查的基础上,选用地面电法进行采空区勘探。首先根据瞬变电磁法的电位单枝衰减曲线、视电阻率曲线等异常响应特征进行定性确认是否存在采空区,再通过视电阻率断面图进一步划定采空区的范围及富水性。选用直流电剖面法三极装置对多层采空区及积水情况进行探测,最终确定该矿区3#、9#、11#及21#等多煤层采空区位置及积水区范围。根据矿区验证钻孔揭露的煤层采空区对应的视电阻率值变化情况,修正视电阻率"门槛值",对视电阻率断面图进行二次解释,重新圈定的采空区范围与积水情况与钻孔资料高度吻合。

In allusion to actual situation of steeply dipping, muhiple coal seams worked-out area in the Hegang mining area, on the ba- sis of abundant geological studies, the surface electric prospecting is used to detect worked-out area. Through anomalous response char- acteristics of TEM potential single branch attenuation curve, apparent resistivity curve etc. carried out qualitative analysis to determine worked-out area position, then based on apparent resistivity profile to further delineate worked-out range and water yield property. Us- ing DC electric profiling tri-electrode installation carried out multi-layer coal seams worked-out area and ponding detection, finally confirmed mining area main mining coal seam Nos.3, 9, 11 and 21 worked-out area positions and ponding ranges. According to verify- ing boreholes revealed w0rked-out area apparent resistivity variations have amended apparent resistivity ＂threshold＂, and carried out secondary interpretation, the once again delineated worked-out area range and ponding situation are highly consistent with drilling data.