【摘要】 对低透气煤层采用底板穿层钻孔网络预抽瓦斯防突时,遇地质构造复杂区预抽瓦斯往往不充分,存在“瓦斯包区”、“瓦斯滞区”,仍不能有效解决突出。试验了顺煤层条带预抽瓦斯防突,解决了此问题,并可作为原始突出煤体的单一防突措施。更多还原

【Abstract】 When gas pre-drainage by crossing boreholes is practiced in coal mines with low gas permeability,the gas in such seams can’t be sufficiently sucked out while coming across complicated geologic structure zone,"gas nest"or "gas standing zone"may exist and gas outburst can’t be effectively under control. For this reason,gas pre-drainage along seam bedding strip was tested for the prevention and control of gas outburst,which solves above problems and can be taken as an individual outburst-prevention measure for original seams.更多还原