Testing Study on Gas Distributing in Goaf of Easy Spontaneous Combustion Coal Mine by Utilizing Gas Drainage Hole

According to the mining plan in the 416 mining face in Chen Jiashan coal mine, an industrial experiment on the distribution of gas gushes in goaf has been made in the paper. There are 5 sets of testing equipment which have been used in 5 drilling. sites joint to gas drainage pipeline. By analyzing the gases collected in the pipeline, the CH(4) consistence has been gained. The relationship of CH(4) Consistence in drilling site along with the distance away from work face is studied. By drawing the curve between CH(4) consistence and the distance, the law of gas changing and other characteristics such as a height peak and a low peak appeared in the curve have been discovered. It has been found through farther analysis that the gas gushes is related to gob leakage, which conduced the CH(4) consistence changing to big to height peak, the gas gushes is related to drainage-hole leakage, which conduced the CH(4) consistence changing to small, and the gas gushes is related to goaf spontaneous combustion, which conduced the CH(4) consistence changing to big from the low peak Firstly. Finally, the important result about the boundary leakage in goal and the position for three zones of coal spontaneous combustion have been brought out. And which is worthy utilizing on mine disaster prevention.