Transient electromagnetic method detecting technology of water- bearing occurence of aquifers in three- soft coal seam overlying rocks

In order to evaluate the hydrogeological conditions of the coal1& oil2 mining under the three-soft coal seam geological conditions and coal2,coal4 overlappi ng mining conditions,the transient electromagnetic method detection was carried out on the first working face of coal1& oil2. Multiple direction observation system was use d for data collection in the roadways of the working face. Therefore,the resistivity profiles of each detectional direction and slices of aquifers were worked out after data pro cessing. According to the resistivity distribute of profiles, the distribution rate of resistivity which showed the relative strength of water-bearing occurence of aquifers was de termined. The relative strong water-bearing anomaly areas were delineated in the slices. Through the comparative analysis of the results of transient electromagnetic detec tion and the actual statistical results of water inrush,it could be seen that there was an obvious corresponding relation between the changing of water inrush and the relativ e strong water-bearing anomaly areas. The detection results indicated that relative strong water-bearing anomaly areas could be determined accurately and effectively by u sing of transient electromagnetic detection technology and evaluated comprehensively the hydrogeological conditions.