Abstract
Based on the principle of gas formation on the coal mining work surface, the article analyzes the main source of gas in the mining area of Dashe coal mine, finds out all kinds of problems existing in the pumping of the upper angle intring tube, and summarizes the real reasons for the backwind of the work surface and the gas exceeding the limit of the upper angle. In view of these reasons, combined with the principle of the formation of the upper angle gas, the mine on the upper angle intring process construction of the intring depth, height and interception area of the investigation, to obtain the best pumping value under different conditions, and according to the results of the inspection in the 21704 work surface test and transformation, and achieved a better pumping effect; According to the test results, the field effectively controls the work surface and the upper angle gas exceeding the limit, ensures the safe production of the work surface and the mine, and provides reference and reference for the treatment of the angle gas on the work surface under the same type of condition.
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