Influence of High Level Final Pitch of Holes and Drilling Hole Amount on Pure Quantity of Gas Extraction

Fluent software is used to simulate pure quantity of gas extraction and gas concentration of upper corner of different final pitch of high level holes and drilling hole amount at 8101 working face of Wangzhuang Mine. We analyze pure quantity of gas extraction and gas concentration of upper corner for different final pitch of high level holes and drilling hole amount. The results show that with the increase of final pitch of holes, the pure quantity of gas extraction shows the trend of first increasing and then decreasing; we make sure that the pure quantity of gas extraction is the biggest when the final pitch of two holes is 6 m; the gas concentration of upper corner shows the trend of first decreasing and then increasing; with the increase of the number of drilling, pure quantity of gas extraction increases gradually, but the increasing amount of pure quantity of gas extraction decreases, and the gas concentration decreases in upper corner, but the reducing amount of gas concentration in upper corner decreasing gradually.