低透气性突出煤层巷道快速掘进的试验研究

针对在低透气性突出煤层巷道掘进过程中，煤与瓦斯突出综合检测指标经常超限，掘进速度缓慢等问题，提出了深孔预裂控制爆破和巷帮钻孔边抽边掘相结合的综合防突技术，研究了深孔预裂控制爆破技术的作用机理，阐述了深孔预裂控制爆破技术的工艺流程和巷帮钻孔的布置参数.研究表明：在低透气性突出煤层中采用深孔预裂控制爆破和巷帮钻孔边抽边掘相结合的防突措施，可有效地消除激发突出的应力和煤体结构的不均匀性，提高煤体强度和煤层透气性，使巷帮钻孔瓦斯抽放量大幅度地提高，增大了煤体抑制突出的阻力，能有效地预防和消除在掘进过程中煤与瓦斯突出的危险性，且提高巷道掘进速度3～4倍.

Study on the roadway excavation rapidly in the low permeability outburst coal seam

In view of during excavating the roadway in the low permeability outburst coal seam, the composite index of coal and gas outburst often went beyond and speed of excavation was very slow, the comprehensive outburst prevention technology with deep-hole pre-splitting-control blasting and joint excavation and gas drainage was put forward, and its mechanism was studied at length. At the same time expatiated process of deep-hole pre-splitting control blasting and layout parameters of hole in gateway. The experimental results show that while excavating the roadway in the low permeability outburst coal seam, the inspiring outburst stress and asymmetry of coal mass are elimi- nated, the coal strength, permeability and the resistance to outburst coal are increased and gas drainage volume is increased dramatically after the comprehensive outburst prevention measure is taken. The measure has a potential effect on preventing and eliminating coal and gas outburst while conducting roadway excavation, and the roadway driving speed is increased by 3 -4 times.