深井强冲击矿压煤层巷道控制技术数值模拟研究

Numerical Simulation Study on Control Technique for Coal Roadway with Strong Rock Burst Hazard in Deep Mine

为探索具有强冲击危险性的深井煤层巷道控制技术,以某矿7121工作面为工程背景,基于FLAC^(2D)数值模拟软件对4种巷道控制方案的围岩应力、位移及塑性区等特征进行分析。数值计算结果表明:方案3巷道应力峰值最小,其最大应力值为30.68 MPa,应力峰值降低约5 MPa;方案4巷道变形量最小,两帮收敛量为21.36 mm,顶底板移近量为16.70 mm;大直径钻孔使围岩提前产生塑性区,释放积聚在煤岩体中的弹性能。"三结构"控制技术的卸压效果好、围岩变形量小、能量释放多,破坏了发生冲击矿压的强度和能量条件。工程实践表明,现场巷道围岩变形控制效果明显,验证了数值模拟结果的合理性。研究成果可为深井煤岩强动力灾害防治提供借鉴和指导。

In order to study the control technique of the coal roadway with strong rock burst hazard in a deep mine, in this paper, 7121 working face in a mine was taken as the engineering backgroundt, and analysis was carried out on the surrounding rock stress, displacement and plastic zone of four roadway control schemes based on FLAC2D numerical simulation software. The numerical calculation results indicated that the roadway peak stress of Scheme 3 was minimal and maximum stress was 30.68 MPa, the peak stress reduced about 5 MPa; the roadway deformation of Scheme 4 was minimal, the convergence amount on two sides was 21.36 mm and the convergence amount between roof and floor was 16.70 ram; the large-diameter borehole created a plastic zone in the surrounding rock in advance, which effectively released the elastic energy accumulated in coal and rock mass. ＂Threestructure＂ control technique has good pressure relief effect, small surrounding rock deformation and more energy release, which destroyed the strength and energy condition of rock burst. The engineering practice showed that the control effect of the roadway surrounding rock deformation was obvious, this verified the reasonableness of the numerical simulation conclusions. The research results can provide reference and guidance for the prevention and control of strong coal or rock dynamical disasters in the deep mine.