摘要
针对赵庄二号井综放工作面上隅角垮落不及时造成瓦斯超限的安全难题,在开展地质力学及煤岩体强度测试的基础上,结合切眼支护方试,依据水力压裂技术原理,计算确定了水力压裂钻孔深度,提出了深孔水力压裂设计方案,并进行了井下现场试验。监测及实践结果表明,采取定向水力压裂后,切眼基本顶实现随采随落,从根本上消除了初采期间采空区大面积悬顶的危险性。该项研究成果可为煤矿初采放顶提供经验指导。
The delayed collapse of upper corners in fully mechanized top coal caving face of Well 2 in Zhaozhuang Mine caused gas overrun.Aiming at this safety issue,based on the geomechanics and the strength tests of coal and rock,combined with the cut-off hole support,and according to the principle of hydraulic fracturing,the research calculated the hydraulic fracturing drilling depth and proposed a deep-hole hydraulic fracturing design to conduct some underground field tests.The monitor and practice results showed that,after adopting directional hydraulic fracturing,mining and falling in no time have been realized in main roof,which fundamentally eliminates the risk of large suspended roofs in the goaf during the initial mining.The research results could provide empirical guidance for top coal caving in the initial mining.
作者
周晋碧
张红军
ZHOU Jinbi;ZHANG Hongjun(Shanxi Jincheng Anthracite Mining(Group)Ca.,Ltd.,Jincheng 048000,China)
出处
《山西煤炭》
2020年第2期18-22,共5页
Shanxi Coal
关键词
综采放顶煤
坚硬顶板
水力压裂
top coal caving in fully mechanized working face
hard roof
hydraulic fracturing
