Study on gas drainage effect of surface holes on protective coal seam mining conditions in Xinji No.1 mine

摘要

To study the gas drainage effect of surface boreholes on the protective coal seam mining conditions in the Xinji No.1 Mine, based on the theory of protective layer mining, first the feasibility of protective layer mining is studied, second 131103, 131105 and 261108 working surface protection layer mining conditions drainage quantity and the extraction rate of the given dividing strip range of conditions of surface hole drainage of protected seam pressure relief gas are studied, at the same time to 131105 working face as an example in accordance with the "coal and gas outburst prevention" requirements related to the protective effect of the protective seam mining is a test.Research shows that: in the test zone as 11-2 under the condition of coal mining protection layer overlying coal 13-1 is feasible and effective, ground drilling single hole gas drainage quantity can reach 2039000 m3 , the ground drilling holes pacing is small in a certain range of hole number, gas in the corresponding field extraction rate is high.