Comprehensive Electromagnetic Methods To Detect Groundwater In Burnt Rocks Under Shallow And Thick Coal Seams

Due to the rapid development of the national economy in recent years,the demands of coal have been at a high level.However,geological disasters such as coalfield mined-out areas,water-logged zone of old mine areasburnt rock water-logged zone and subsidence column threaten coal mine safe production directly,and endanger railway and highway,water conservancy and power engineering facilities,industrial and civil buildings.At present,most of China's mined-out areas and burnt rock areas have not been processed,and their range is difficult to determine,and with long-time waterlogging,there are major security risks.Therefore,it is important to find out the spatial distribution of these disaster sources.Effectively and economically combined with the characteristics of various geophysical exploration methods find out the sources of these disasters and thus accurately evaluating their water content are of practical significance to coal mine safety production,disaster management and prevention and ecological restoration and management of mined-out areas and burnt rock areas.Burnt rocks area flood threat of coal mine safety production directly,In order to make a qualitative interpretation of the geophysical anomaly taking Xinjiang General Gebi Mine No.2 as an example,guided by the theories of geophysical prospecting and hydrogeology,combined magnetic method with electromagnetic method and combined geophysical prospecting with drilling,boundary and water accumulation of burnt rock area were comprehensive detected,getting the following preliminary conclusions:First,the magnetic anomaly area of B₅ and B₂ coal layer was determined by magnetic field.Second,the electrical anomalies of B₅ and B₂ coal layer were defined by tem.Third,based on the comparison analysis and mutual verification of the two geophysical data,the boundary of B₅ and B₂ coal seam and the rich water area were deduced.Fourth,On-site investigation and the contrast with drilling materials illustrate.It is an effective way to determine ponding boundaries of the fire zone by combining precision magnetic method electromagnetic method in areas with serious burning,extensive ponding,as well as shallow and thick coal bed.Such an effective probing method appears significant and deserves further researches.