为分析煤矿井下工作面打抽放钻孔和防突钻孔过程产生的煤与瓦斯突出机理,分析了打钻时的突出过程,并从工作面煤岩体强度硬度、工作面三区分布规律、煤体的应力应变全过程、钻孔能释放地应力、钻孔周围煤岩塑性区半径、煤岩体流变机理等方面对该类突出进行了理论分析。研究结果和工程实践表明:工作面钻孔能有效排放工作面煤体中的瓦斯和降低瓦斯压力、增大工作面卸压区长度、增大工作面防突屏障厚度,起到防突效果;但在工作面打密集钻孔会破坏煤岩体原有结构、降低煤岩体原有的硬度和强度、降低工作面防突屏障的强度,同时在打钻孔过程会产生扰动,以致增大突出的危险性。所以工作面打钻孔具有防突和诱导突出双重作用。

In order to analyze the coal and gas outburst mechanism occurred from the gas drainage borehole drilling and the gas outburst prevention borehole drili ng processing at the working face in the underground mine, the outburst processing occurred from the borehole drilling was analyzed.From the strength and hardness 0 f the coal and rock in the working face, the three zone distribution law of the working face, the stress and strain full process conditions of the seam, the ground stress re leased the borehole, the plasticity zone radius of the coal and rock around the borehole, rheology mechanism of the coal and rock and others, a theoretical analysis wa s conducted on the outburst. The study results and the engineering practices showed that the boreholes in the coal mining face could effectively drain the seam gas in t he coal mining face, reduce the seam gas pressure, enhance the length of the pressure releasing zone in the coal mining face, enhance the thickness of the outburst pr evention curtain in the coal mining face and have the outburst prevention effect. But the intensive boreholes drilled in the coal mining face would destroy the previous str ucture of the coal and rock, reduce the previous hardness and strength of the coal and rock and reduce the strength of the outburst prevention curtain in the coal minin g face.Meanwhile the disturbances occurred during the borehole drilling process could increase the danger of the outburst and thus the borehole drilling in the coal mini ng face would have double roles of the outburst prevention and the outburst induced.

国家自然科学基金资助项目(51004048,51074161)；中国博士后基金资助项目(20100470998)；国家重点基础研究发展计划(973计划)资助项目(2011CB201205)；湖南省教育厅资助项目(09C409)；