摘要
针对近距离煤层下层工作面巷道采用外错布置易出现顶板下层、 片帮、 底鼓的问题,研究了下层巷道的破坏机理和通过破坏上层煤柱进行顶板卸压的治理方法,以沙坪煤矿1811工作面运输巷为工程背景,进行了近距离煤层上层煤柱定向水力压裂卸压工艺设计,对泵压进行了理论计算,并采用数值模拟对煤柱卸压治理效果进行了验证.研究结果表明:未卸压时,下层煤柱垂直应力峰值在12~14MPa范围内,且应力峰值分布不均匀,局部垂直应力峰值达到13.8MPa.对上层煤柱卸压后,下层煤柱垂直应力峰值在8~9MPa范围内,最大应力峰值为9.1MPa,应力峰值分布较为均匀,煤柱卸压效果明显.
Aiming at the problem that the roadways in the lower working face of short-distance coal seam are easy to appear roof subsidence,rib spalling and floor heaving when they are arranged outer-misaligned,the failure mechanism of the lower roadway and the treatment method of roof pressure relief by destroying the upper coal pillar are studied,and the directional hydraulic fracturing technology design of the upper coal pillar of short-distance coal seam is carried out based on the engineering background of transportation lane in the 1811 working face of Shaping Coal Mine.The pump pressure is calculated theoretically.The effect of pressure relief treatment of coal pillar is verified by numerical simulation.The results show that the peak vertical stress of the lower coal pillar is in the range of 12~14MPa without unloading,and the distribution of the peak stress is not uniform,and the peak local vertical stress reaches 13.8MPa.After unloading the upper coal pillar,the vertical stress peak value of the lower coal pillar is in the range of 8~9MPa,and the maximum stress peak value is 9.1MPa.The distribution of the stress peak value is more uniform,and the effect of unloading the coal pillar is obvious.
作者
孙健
SUN Jian(Shanxi Jinshen Energy Co.,Ltd.,Hequ 036500,China)
出处
《煤炭工程》
北大核心
2019年第S1期151-154,共4页
Coal Engineering
关键词
近距离煤层
外错布置
巷道卸压
水力压裂
close coal seams
outer-misaligned roadway
roadway pressure relief
hydraulic fracturing
