Study on coordinative pre-drainage technology in stage area of contiguous outburst seams

According to the problem the regional pre-drainage measures with the boreholes through strata were applied to a coal mine with a contiguous seams,due to ineffectively master the borehole gas drainage variation law and a relationship between the drainage time and the borehole intevals could not befiectively contrlled,thus the issue of the mine mining and driving layout was seriously affcted.In combination with the regional pre-drainage practices with the boreholes through the stata in Wwuian Mine a plan comparison was conducted on the borehole through the strata and a study was oonducted on the time-space evolution law of the regional pre-drainage.Based on the circumstances ,the regional pre-drainage model with the boreholes through the strata was established, and the accuracy rate reached to 91%.Thus according to the mining and drving alternative plan,a design idea of the egional cordinative pre-drainage measure parameters at the stage of the borehole through foor strata were determined,thus the combined outburst prevention issue of the outburst seams was solved.