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高瓦斯及煤与瓦斯突出矿井抽放钻孔封孔后,浓度衰减快,实施抽放效果差,分析其主要原因是封孔长度短、封孔质量差,钻孔深度浅,与老孔有串气现象,形成漏气通道,另外,黄泥或水泥药卷干化凝固后,可能产生裂缝或收缩,也将影响抽放钻孔气密性。封孔效果的好坏将直接影响抽放效果。因此,导致抽放瓦斯浓度低,抽放效果差。最关键是初次封孔的一些问题,初次封孔易造成跑浆冒浆,严重制约二次封孔及抽采浓度。
After gas drainage and sealing of high gas and coal and gas outburst mines, the concentration declines rapidly and the effect of drainage is poor. The main reason for the analysis is that the sealing length is short, the sealing quality is poor, the drilling depth is shallow, A series of gas phenomenon, the formation of gas leakage channel, in addition, yellow mud or cement drug dried and solidified, cracks or shrinkage may occur, will also affect the drainage drill tightness. Sealing effect will have a direct impact on the drainage effect. As a result, low gas drainage and poor drainage efficiency result. The key is the first time sealing a number of problems, the first seal can easily lead to run pulp slurry, severely restricted the secondary sealing and extraction concentration.