Abstract
In order to optimize the gas drilling in pre-pumping coal seam and strengthen the gas emission effect, This paper uses Chenggui high-speed railway Baiyanglin tunnel as the research object. The FLUENT numerical simulation software is used to simulate the change of coal seam gas pressure during the process of gas emission and the influencing factors of the effect of gas emission. According to the numerical simulation results, the parameters including hole spacing, hole depth and aperture are optimized. The results show that the recommended diameter of the pre-emission gas is 75 ∼ 100mm, the drilling depth is 1.5 ∼ 2.5m, and the hole spacing is 2m.
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