高位定向钻孔分支对瓦斯抽采效果影响研究

Study on the Influence Branch Excavation of High-level Boreholes on Gas Drainage Effect

本文依托山西某煤矿4号煤层18103工作面进行了现场试验,通过开挖分支孔对对回采工作面上隅角瓦斯浓度和2号钻场瓦斯抽采量等影响参数分析,得出开挖分支孔对回采工作面采空区和上隅角瓦斯瓦斯治理效果明显,对瓦斯抽采起到了积极作用,具有较高的应用价值,但随着分支孔的数目增多对抽采瓦斯效果影响变小。

In order to further investigate the effect of gas extraction after branch excavation by high-level directional drilling,experiments were carried out at coalbed 18103 working face in Some Coal Mine,Shanxi Province.By analyzing the gas concentration at the upper corner of working face and the gas extraction volume at the No.2 drilling site,the results show that the effect of branch hole excavation on gas control in the goal and upper corner of the mining face is obvious,but the increase of the number of branch holes has less influence on the gas extraction effect.The research shows that the branch excavation of high-level boreholes obviously plays a positive role in gas extraction,and has high application value.