瞬变电磁法在古汉山矿回风巷底板赋水性勘探中的研究

Study of transient electromagnetic method in exploration of water bearing property offloor of return airway on 17042 working face in Guhanshan Mine

为了充分了解古汉山矿17042工作面回风巷底板赋水性,采用瞬变电磁法对其底板赋水性进行了勘探,探测时,17042工作面回风巷自通尺0 m处开始,由外往里朝底板内帮俯角30°、内帮俯角60°、俯角90°、外帮俯角60°和外帮俯角30°五个方向探测500 m长,共完成测线长度2 500 m,点距均为10 m。此次瞬变电磁勘探共计完成测线长度2 500 m。研究得出,通过瞬变电磁勘探视电阻率断面图分析,物探范围内没有高阻异常区,正常区域岩层的赋水性较弱,发生底板突水的可能性较小。通过对瞬变电磁勘探异常区平面图分析,探测范围内低阻异常区共有3处,物探范围内没有高阻异常区。其他正常区域岩层的赋水性较弱。研究可为矿上合理安排防治水计划、工程及预防水害事故的发生提供参考。

In order to fully understand the water bearing capacity of the floor of the air return roadway in 17042 working face of Guhanshan Mine,this paper uses the transient electromagnetic method to explore the water bearing capacity of the floor.During the detection,the return air roadway of 17042 working face started from a distance of 0 meters and was 500 meters long in five directions:from the outside to the inside,facing the bottom plate with an inner wall depression angle of 30°,an inner wall depression angle of 60°,a depression angle of 90°,an outer wall depression angle of 60°,and an outer wall depression angle of 30°.The total length of the measurement line was 2500 m,with a point spacing of 10 m.The total length of the survey line for this transient electromagnetic exploration is 2500 m.The study shows that there is no high resistivity abnormal area within the geophysical exploration range through the analysis of the apparent resistivity section map of the transient electromagnetic exploration,the water bearing property of the rock stratum in the normal area is weak,and the possibility of floor water outflow is small.Through the analysis of the plan of the abnormal area of transient electromagnetic exploration,there are 3 low resistivity abnormal areas in the exploration range,and there is no high resistivity abnormal area in the geophysical exploration range.The water bearing property of rock strata in other normal areas is weak.The study provides a reference for the rational arrangement of water prevention plans,projects and the prevention of water disasters in the mine.