A method to determine the pre -exhausting gas bandwidth of the coal mining of the coal mine

Abstract

A method to determine the width of the pre-drainage gas zone in the tunnel of the coal mine mining working face is to drill 5 gas injection boreholes at the starting point of construction 10m away from the entrance of the tunnel in the mining area tunnel closest to the mining working face. The depths of the holes are respectively 40m, 35m, 25m, and 20m, and cement is injected into the hole to seal it. The tracer gas SF6 was injected into the gas injection borehole and measured by the SF6 tester at 5 test points every day for 300 days. Based on the measurement data relationship diagram, the width of the tunnel pre-drainage gas zone at different tunnel exposure times of the coal seam was obtained. . The beneficial effects of the present invention are: filling the gap in the method of measuring the width of the tunnel pre-discharge gas zone for measuring the exposure time of different coal seam tunnels in different mines, utilizing the characteristics of stable diffusion and easy capture of the tracer gas SF6, and ensuring that the normal production of the mine is not affected. , accurately determine the width of the pre-drainage gas zone in the coal seam tunnel. This method is simple to operate and low-cost. The coal mine's own technical capabilities can be used to determine it, and it has very good economics and popularity.

Description

technical field [0001] The invention relates to the field of prediction of gas emission in a coal mine mining face, in particular to a method for measuring the width of a roadway pre-discharging gas belt in a mining face. Background technique [0002] Gas prevention technology in coal mine mining face includes two aspects: gas emission prediction and gas drainage. Only by judging the different sources and quantities of gas through gas emission prediction can gas drainage be effectively guided. The main sources of gas in the production process of the coal mining face are: the local coal seam, adjacent layers and surrounding rocks, among which the gas in the local coal seam is the main source that affects safe production. Coal mines must predict the amount of gas emission in the coal seam before mining, so as to carry out targeted gas drainage measures. [0003] China's coal mines adopt the national standard "Coal Mine Gas Emission Prediction Specification" (AQ1018-2006) for ...

AI Technical Summary

Problems solved by technology

China's coal mines are widely distributed, and the coal formation and occurrence conditions of coal are very different. Since there is no way to directly measure this parameter, we can only use different coal qualities to estimate the width of the roadway pre-drainage gas belt, which leads to the predicted value of gas emission in this coal seam. large error

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