School of Resources and Geosciences,China University of Mining and Technology Xi'an Research Institute of China
Coal Technology & Engineering Group Corporation

为准确探测掘进工作面前方老空水赋存情况,采用三维时域有限差分法,对老空水的全空间瞬变电磁响应进行了数值模拟。结果表明:当发射回线法线与巷道掘进方向一致时,位于巷道掘进方向的老空水比两侧位置的磁场对时间导数曲线幅值更大,对应视电阻率曲线形态相同、极小值更低、响应时间更早;老空水距离巷道掘进工作面远近和体积大小不同,其磁场对时间导数曲线和对应视电阻率曲线特征与不同位置老空水响应特征相似,但前者视电阻率曲线极小值差异更明显。通过实际应用,其探测结果与后期钻探验证基本吻合,表明井下瞬变电磁法是探查老空水非常有效方法之一。

In order to prospect gob water precisely,the authors studied the whole space transient electromagnetic response of gob water by numerical modeling using t hree dimensional finite difference time domain method. The numerical modeling results show that in the situation of normal direction of the transmitting loop being parallel with tunnel,the response curve amplitude of time derivative for gob water located in ahead of heading face is stronger than that located in the two sides of heading face. M oreover,curve minimum value of situation with gob water located in ahead of heading face is smaller than that gob water located in two sides of heading face as well as the response time of situation with gob water located in ahead of heading face is earlier than that gob water located in two sides of heading face. However,the shape of two cur ves are similar. In addition,for the gob water with different volumes and different distances from the heading face,the response curves are different. Finally,the effectivenes s of prospecting gob water of mining TEM is testified by drilling data,this shows that the mining TEM is one of very effective way to prospect gob water. .

国家重大科学仪器设备开发专项资助项目(2011YQ03013307)；