深部回采巷道防冲释能耦合支护技术及应用

An anti-punching and energy-releasing coupling support technology in deep mining roadway and its application

为解决深部回采巷道围岩大变形、支护体易破断失效的难题,以济三煤矿深部回采巷道为研究对象,采用理论分析、数值模拟及室内试验相结合的方法,研究围岩变形破坏机制、防冲释能耦合支护技术原理及其应用效果。结果表明:济三矿区深部回采巷道大变形易冲击的主要原因在于复杂的高应力场及其叠加,使得以厚层坚硬砂岩为主的顶板易积聚能量,而现有支护体系无法有效吸收并转化围岩剩余能量;相比于传统支护体系,恒阻大变形支护体系可多吸收能量(DFDx),实现了围岩大变形能量的控制性释放,因其恒阻值(F)和变形量(Dx)均可单独设计,解决了防冲支护体系中高预应力难施加、易破断及定量化防冲设计的难题,现场应用效果显示,恒阻支护相比原支护围岩变形减少约40%,超前影响范围减少约33%。研究成果可为类似具有冲击倾向性的深部回采巷道支护设计提供借鉴。

Taking the deep mining roadway in Jisan coal mine as the research object,the deformation and failure mechanisms of surrounding rock,and the principle and application effect of anti-scouring and releasing energy coupling support technology were studied by combining theoretical analysis,numerical simulation and laboratory test to solve the problems of large deformation of the surrounding rock and easy failure of the support body in deep mining roadway.The results show that large deformation and impact of deep mining roadway in Jisan mining area own to the complex high stress field and its superposition,which make the roof of thick hard sandstone easily accumulate energy.Comparing with the traditional support system which cannot effectively absorb and transform the residual energy of the surrounding rock,the constant resistance large deformation support system can absorb more energy(DFDx)and realize the controlled release of the shape energy of the surrounding rock due to that the constant resistance value(F)and the deformation quantity(Dx)can be designed independently,which solves the problems of high prestressing force difficult to apply,easy to break and quantitative anti-scour design in the anti-scour support system.The field application results show that the deformation and the advance influence range of the surrounding rock of the constant resistance support are respectively reduced by about 40%and 33%compared with the original support.The research results can provide a reference for similar deep mining roadway support design with an impact tendency.