摘要
底板岩巷穿层钻孔抽采技术和本煤层定向长钻孔抽采技术是目前高瓦斯和突出矿井回采工作面最为主要的瓦斯治理措施。晋城矿区赵庄矿煤层具松软低透气性特点,主要采用岩巷穿层钻孔消突为主,本煤层顺层钻孔消突为辅的瓦斯治理方法。但底板岩巷穿层钻孔存在工程量大、施工周期长及成本高等缺点,本煤层钻孔存在钻孔抽采不均匀、钻孔覆盖密度不足等技术缺陷。为对比考察底板梳状长钻孔与底板岩巷穿层钻孔的抽采效果,在赵庄矿1307采面开展了2种瓦斯治理方法。结果表明:抽采条件和抽采范围相同条件下,5个底板梳状长钻孔的瓦斯抽采总量占到底板岩巷穿层钻孔瓦斯抽采总量的75.4%,而底板梳状长钻孔的经济投入仅占底板岩巷穿层钻孔经济投入的29.2%。由此得出,研究区梳状长钻孔替代穿层钻孔的瓦斯抽采技术是可行的。该研究为底板梳状长钻孔替代底板岩巷的技术可行性提供了实践参考,为松软低透的高瓦斯和突出矿井的瓦斯治理提供了更为经济可行的治理方案。
Drainage technology of translayer borehole in floor roadway and directional long hole are the most important gas control measures in high gas and outburst-prone mining face at present. The coal seam in Zhaozhuang mine has the characteristics of being soft and low gas permeability. It is difficult to drill and form holes in a coal seam. For gas control, the major method is to drill a translayer borehole to eliminate gas outburst, supplemented by in-seam gas drainage boreholes. However, there are shortcomings such as large engineering volume, long construction period and high cost of drilling in floor rock roadway. The directional long borehole has technical defects such as uneven drainage and insufficient coverage. In order to compare and investigate the drainage effects of the long borehole and the borehole in the floor rock roadway, the drainage effect of two gas control methods in mining face 1307 was investigated. The results show that under the same mining conditions and coal body range, the total amount of gas extraction by five comb-shaped long boreholes accounted for 75.4% of the total gas drainage of the translayer boreholes through the floor, while the economic input of the comb-shaped long boreholes accounted for only 29.2% of the translayer boreholes in the floor. In the case that the extraction effect is basically the same, the comprehensive economic benefit of the comb-shaped long hole is higher. From this it is concluded that the gas drainage technology of the comb-shaped long boreholes to replace the translayer boreholes is feasible. The study provides a practical reference for the technical feasibility of substitution of the translayer boreholes with comb-shaped boreholes, a more economical and feasible treatment scheme for the gas control in gas outburst-prone coal mines with soft and low permeability coal.
作者
李宏
刘明举
郝光生
邓奇根
董艳军
LI Hong;LIU Mingju;HAO Guangsheng;DENG Qigen;DONG Yanjun(School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Chongqing Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Chongqing 400037,China;Shanxi Jincheng Anthracite Mining Group Co.,Ltd.,Jincheng 048006,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2019年第6期32-38,共7页
Coal Geology & Exploration
基金
国家自然科学基金项目(51774116)~~
关键词
穿层钻孔
梳状长钻孔
底板岩巷
分支钻孔
经济效益
赵庄矿
沁水盆地南部
translayer borehole
comb-shaped long borehole
floor rock roadway
branch borehole
economic benefits
Zhaozhuang coal mine
south of Qinshui basin
