Application of mine–hole joint microseismic technology in monitoring the damage depth of working face floor
(2.College of Geology and Environment, Xi’an University of Science and Technology, Xi’an, China 710054)
【Abstract】Accurate prediction of the mining damage depth of floor is a key problem in the prevention and control of floor water hazards in mining, especially in the case of confined water. It is very important to develop a strategy for water control. According to the geological characteristics and working-face layout of Baode coal mine in Shanxi Province, a high-precision mine–hole joint microseismic monitoring system was deployed to detect the floor damage depth in No. 81307 working face in real-time. The velocity model was calibrated and the location accuracy was verified by the hammering method. It is proved that the location accuracy of the microseismic monitoring system could meet the requirements of water prevention and control. During the monitoring period, the working face was mined 600 m. According to the study results, the damage depth of the floor is 30 m under the floor; the damage depth of No. 2 return airway of No. 81308 working face is deeper; the damage depth of No. 1 return airway of No. 81307 working face is only 15 m; the advance damage distance of the working face is 25 m. The monitoring results are consistent with the results measured by the water-pressure test in the adjacent No. 81306 working face. The mine–hole joint microseismic monitoring technology can obtain damage depth and its spatial distribution characteristics of the floor of a working face, and it can better serve coal-mine water prevention and control.
【Keywords】 mine–hole joint microseismic monitoring technology; floor damage depth; microseismic events; Baode coal mine;
(Translated by HAN R)
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