Investigation of Collapse Column of Transportation Lane Based on Advanced Detection Method of Earth-electric-magnetic Combination
The hydrogeological conditions of the North China type coalfield are complicated,and it is seriously threatened by water damage of collapse columns,faults and other structures.In order to accurately identify the development form and water richness of the collapse column,a set of advanced detection meth-ods for the collapse column is combined considering the geo-electrical conditions of the geological body.Taking the collapse column of transportation lane 3上,717 of Qiwu Coal Mining industry as the research ob-ject,the transient electromagnetic method,parallel electrical method and seismic wave advance detection are combined to advance detection,and the geophysical anomaly area is explored by drilling.The results show that the collapse column is ellipsoidal in the horizontal direction,with a major axis of 46.7 m and a mi-nor axis of 28.6 m,and an area of about 946 m2.The overall water richness was weak in the exploration range,and only YC1 and YC2 low-resistance anomaly areas were delineated in the head-on direction,in which the collapse column was partially located in the YC2 range.The two abnormal areas are located under the floor of 3上 coal seam and are mainly affected by the sandstone aquifer of the floor.The development range and water-rich state of subsidence column revealed by downhole drilling are basically consistent with the results of geophysical interpretation,which verifies the accuracy and reliability of the joint exploration results,and provides practical basis for the development form of subsidence column and water-rich ad-vanced detection in similar areas in the future.
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