Application of High-position Gas Drainage Technology with Large and Medium Borehole in Coal Mines
In underground mining operations,the overlying rock is prone to migration and fracture due to the influence of mining,and it is easy to form a spatial fracture field under the criss-cross distribution of fractures,which provides enrichment space for free gas relief,and causes a large hidden danger of gas enrichment for mining.In order to further improve the gas drainage effect in the fissured zone of goaf,taking the mining of a coal mine as an example,the corresponding working face was summarized first,and then the drainage technology with high and long borehole with large aperture(Φ203 mm)was proposed and analyzed.Finally,the parameters of high long directional borehole with large aperture were designed according to the actual situation.Practical application proves that the scheme has good gas drainage effect and can improve the gas control ability of mining enterprises.
high-position borehole with large aperturegas drainagetechnology application
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