矿井瞬变电磁法在老窑水超前探测中的应用

Application of Mine Transient Electromagnetic Method in Forecasting Goaf Water

介绍了矿井瞬变电磁超前探测技术的原理与方法,在某矿2号总回风巷的掘进过程中,采用该技术对掘进头前方的老窑积水区进行了探测。探测结果表明,矿井瞬变电磁超前探测技术能准确圈定老窑水的位置,其施工方便快捷适于实时跟踪探测,但对积水量仅能做定性评价而不能给出定量解释,视电阻率断面图上探测异常区域分布比实际积水区间要大,且侧帮测点易受到金属锚网支护的影响,同时由于采用多匝小回线装置形式,发射电流关断时间过长,存在近距离探测盲区。

In this paper,the principle of mine transient electromagnetic method（MTEM） is introduced.The method was used to forecast the goaf water in the course of the No.2 main return airway driven in a coal mine.The results show that the position of the goaf water can be found out accurately and rapidly by MTEM,the operation is convenient and it can be applied to make the real-time prediction continuously,the qualitative analysis of the water can be made,but the quantitative analysis cannot be,because the abnormal area is larger than the real region filled with the water in the map of the apparent resistivity isoline.Furthermore,the data of the side wall of the drift is influenced easily by the bolting with wire mesh and the blind zone in short distance cannot be avoided.