Abstract:
Based on the analysis of geological data of Gaozhuang Coal Mine, the parallel electrical method was used to monitor the fracture process of roof strata, and the dynamic development law of caving zone and water-conducting fracture zone was analyzed. The method of apparent resistivity parameter in a borehole, the direct current method of advanced detection and electrode current method were respectively used for inversion interpretation, and the inversion results were compared with the calculation results of the regulations for coal mining under buildings, water bodies and railways. The results show that the height of roof caving zone in 3
up303 working face of Gaozhuang Coal Mine is 20 m, and the ratio is 3.7 between caving zone and mining height; the height of the water-conducting fractured zone is 54 m, and the ratio is 10.2 between fissure zone and mining height; the maximum leading influence distance of mining stress is 48.6 m; the field measured results are consistent with the calculated values, indicating that the dynamic monitoring and inversion results are reliable. The combination of a borehole apparent resistivity parameter method and the direct current method for advanced detection effectively solves the problem that the loose layer is not easy to form holes. It provides a new method for monitoring the development height of roof caving zone and water-conducting fault zone of coal seam.