原相煤矿深部煤层巷道掘进迎头应力演化规律与优化措施研究

Study on the Stress Evolution Law and Optimization Measures of Heading in Deep Coal Seam of Yuanxiang Coal Mine

针对原相煤矿深部煤层巷道掘进工作面迎头应力集中问题,采用理论分析与数值模拟研究了巷道掘进迎头应力分布特征及演化规律,迎头应力分布呈现卸压区-集中区-原岩区,超前支承应力位于迎头前3m,集中范围为14m。在此基础提出了钻孔卸压应力优化措施并模拟了钻孔卸压后围岩应力和塑性区的状态,数值模拟结果表明卸压钻孔的应力和塑性破坏范围相互连通,形成有效的卸压区,现场实践后掘进速度明显提高,围岩变形程度缓解。

Aiming at the problem of stress concentration in the heading face of deep coal seam roadway in Yuanxiang Coal Mine,the distribution characteristics and evolution law of the heading stress in roadway excavation are studied by theoretical analysis and numerical simulation.The distribution of the heading stress presents the pressure-relief area-concentration area-primary rock area,the leading bearing stress is located 3 m in front of the heading,and concentration range is 14 m.On this basis,the stress optimization measures for borehole pressure relief are put forward and the state of surrounding rock stress and plastic zone after borehole pressure relief is simulated.The numerical simulation results show that the stress and plastic failure range of the pressure relief borehole are interconnected to form an effective pressure relief zone.The excavation speed is significantly improved and the deformation degree of surrounding rock is relieved after field practice.