DETECTION OF LIMESTONE WATER-CONDUCTING CHANNELS IN COAL MINE BY PARALLEL 3D ELECTRIC METHOD OF SURFACE BOREHOLES
(1. College of Earth and Environment，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. State Key Laboratory of Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221008，China)
Abstract：It is put forward that the parallel 3D electrical method of surface boreholes can be used to detect the limestone water-conducting channels；and it is also a new geophysical prospecting means for the prevention of limestone water disaster in coal mine. Generally，three boreholes are set on the ground and an electrode cable is imbedded in each borehole to detect the objective strata. After the observation system of the parallel electric method is correctly connected，the AM mode of data-collecting is adopted by this method. Coordinate of each electrode in borehole is edited；and electrical resistivity tomography of AM data is conducted to obtain the 3D resistivity changes among the three boreholes. Based on the electrical property differences between water-rich area and normal strata，the possible resistivity manifestation of water-rich area is analyzed. Combining with the existing data such as stratigraphic column，water gushing in roadways，grouting materials，etc.，the distribution ranges of aquifer region and water-conducting channel are found out. The exploration case for detecting water-conducting channels in Xieqiao coal mine of Huainan mining industry by using this method is conducted. The detection results show that this method can be used to well find out the limestone water-conducting channels in water inrush area. It provides a good guidance to the work of grouting and water plugging in limestone strata，which leads to dimish the water inflow of Dongfeng well yard greatly and the threat of limestone water inrush have been well removed.
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2010, Vol. 29 
