Research On Gas Drainage Technology At Gob Area Of Guhanshan Coal Mine

Guhanshan coal mine of HNCC is belong to coal and gas outburst mine.This paper describethe coal mine at first.Then through the gas parameters of the coal mine of the gas drainage in15mining area. In this paper, the gob of a coal mine in Guhanshan coal mine of HNCC coalfield ischoosen as the research object, according to the analysis of the gas drainage status, the gasemission laws, the ratio of gob gas emission, the gas drainage methods and gas drainageparameters in this mine, we get that gas drainage of this mine gob is still very inadequate. Aftersummarizing and analyzing the laws of methane movement in goaf and the gas drainage methods,I establish a goaf gas drainage numerical model and carry on numerical simulation, at last get theconclusion: This mine competent buried tube test on the depth of150m, and in the50m,100mconnected to a length of pipe for30m, gas extraction, its effect is best, can make the uppercorner gas concentration to below0.7%. In this test mine the gas concentration of surface gasdrainage is between50%and65%; the gas drainage effectivenes with buried tube drainage andhigh position drilling is better. The conclusion can be as the theoretical basis in the mine gob gasdrainage and also have some practical significance for increasing this mine gob gas drainageefficiency.