定向水力压裂切顶卸压技术研究及应用  

Research and Application of Top Cutting and Pressure Relief Technology in Directional Hydraulic Fracturing

作　　者：张广杰[1] 程志斌[1] 丁坤朋 Zhang Guangjie;Cheng Zhibin;Ding Kunpeng(Henan Institute of Technology,Henan Polytechnic University,Jiaozuo Henan 454003)

机构地区：[1]河南理工大学河南理工产业技术研究院,河南焦作454003

出　　处：《山西冶金》2020年第5期51-53,60,共4页Shanxi Metallurgy

摘　　要：针对目前煤层顶板坚硬而导致沿空巷道围岩控制困难的问题,以山西某矿8118工作面为工程背景,采用理论分析的手段研究了沿空巷道围岩变形破坏形成机制,提出了水力压裂切顶卸压技术,并在现场进行了试验。结果表明:沿空巷道围岩失稳主要因素是采空区侧基本顶回转、断裂、垮落对煤柱侧的影响;有效切断基本顶是该技术的关键;压裂段两帮移近量142 mm,降低30.5%,顶底板移近量285 mm,降低50.2%;采用该技术可以消除或减弱坚硬顶板形成的悬臂结构,达到留巷的目的。Aiming at the problem that the surrounding rock of gob side entry is difficult to control due to the hard roof of coal seam,taking 8118 working face of a coal mine in Shanxi as the engineering background,the formation mechanism of surrounding rock deformation and failure of gob side roadway is studied by means of theoretical analysis,and the technology of hydraulic fracturing roof cutting and pressure relief is proposed,and the industrial test is carried out in the field.The research results show that the main factor of surrounding rock instability of gob side roadway is the influence of basic roof rotation,fracture and collapse on coal pillar side.Effective cutting off the basic roof is the key of the technology.The displacement of two sides of fracturing section is 142 mm,reduced by 30.5%,and the displacement of roof and floor is 285 mm,which is reduced by 50.2%.The formation of hard roof can be eliminated or weakened by using directional hydraulic fracturing roof cutting and pressure relief technology.The cantilever structure can achieve the goal of retaining roadway.

关 键 词：坚硬顶板 沿空巷道 水力压裂 切顶卸压 围岩失稳 

分 类 号：D353[政治法律—政治学]