采空区下工作面初采放顶水力压裂控制垮落技术研究  

Research on hydraulic fracturing control collapse technology for initial mining and roof caving of working face under goaf

作　　者：王浩[1] 刘江伟 刘耀友 WANG Hao;LIU Jiangwei;LIU Yaoyou(Production Technology Department,Wanbei Coal Power Group,Suzhou 234000,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]皖北煤电集团生产技术部,安徽宿州234000 [2]山东科技大学能源与矿业工程学院,山东青岛266590

出　　处：《煤炭科技》2024年第6期126-131,共6页Coal Science & Technology Magazine

摘　　要：采空区下工作面初采期间顶板突然垮落容易造成上覆采空区瓦斯瞬间涌出等问题,而水力压裂技术可有效弱化顶板促使其及时冒落,然而采空区下初采期间的顶板应力环境具有竖向应力低、水平应力高的特点,进而通过改变水压裂缝的扩展形态而影响压裂效果。对此,揭示了采空区下工作面初采放顶水力压裂弱化顶板的机理,制定了水力压裂的方案,并进行了现场应用,实现了初采期间顶板的缓慢、分阶段垮落,实施效果良好。During the initial mining period of the working face under the goaf,sudden collapse of the roof can easily cause problems such as instantaneous gas outburst from the overlying goaf.Hydraulic fracturing technology can effectively weaken the roof and promote its timely collapse.However,the stress environment of the roof during the initial mining period under the goaf has the characteristics of low vertical stress and high horizontal stress,which can affect the fracturing effect by changing the expansion form of water pressure cracks.In response to this,the mechanism of weakening the roof through hydraulic fracturing during the initial mining of the working face under the goaf was revealed,and a hydraulic fracturing plan was developed and applied on site.To achieve slow and phased collapse of the roof during the initial mining period,the implementation effect was good.

关 键 词：初采放顶 水力切顶 顶板垮落 采空区下 分段垮落 

分 类 号：TD327[矿业工程—矿井建设]