摘要
针对沿空留巷煤柱靠采空区侧悬顶造成保留巷道变量大、控制困难问题,提出水力压裂切顶卸压技术。以长平煤矿Ⅲ4321工作面为研究背景,模拟了动压影响巷道水力压裂切顶卸压全过程,获得了水力压裂和工作面回采中煤岩层的弹性模量、损伤场和应力场分布规律,揭示了水力压裂的切顶卸压规律。并进行了动压巷道水力压裂切顶卸压现场应用,结果表明:采取水力压裂切顶卸压措施后,受动压影响的Ⅲ43212巷两帮最大移近量和顶底板移近量分别降低了60.01%、63.32%,有效控制了动压影响巷道围岩变形,为类似条件下动压影响巷道围岩变形控制提供了借鉴。
Aiming at the large deformation and difficult control of the retained roadway caused by the coal pillar roof hanging at the goaf side,the hydraulic fracturing roof cutting and stress relieving technology is proposed.Based on rock mass mechanics and multi field coupling theory,a coupled seepage stress damage mathematical model of rock hydraulic fracturing is established considering water movement,rock deformation and failure.The mathematical model is solved by finite element method.Based on the research background of theⅢ4321 working face in Changping Coal Mine,the whole process of hydraulic fracturing and roof cutting and stress relieving is numerically simulated.The elastic modulus,damage field and stress field distribution of coal seam in hydraulic fracturing and mining are obtained,and the law of hydraulic fracturing roof cutting is revealed.According to the field application in the dynamic pressure roadway,the maximum side-to-side and roof-to-floor convergence of theⅢ43212 roadway are reduced by 60.01%and 63.32%respectively after the hydraulic fracturing roof cutting.The surrounding rock deformation of the roadway is controlled.
作者
李文龙
LI Wen-long(Jinsheng Company of Jinmei Group,Jincheng 048012,China)
出处
《煤炭工程》
北大核心
2020年第8期54-59,共6页
Coal Engineering
关键词
动压影响
巷道
水力压裂
切顶卸压
耦合模型
dynamic pressure influence
roadway
hydraulic fracturing
roof cutting and stress relieving
coupling model
