坚硬顶板切顶留巷围岩稳定性控制技术研究

Study on Surrounding Rock Stability Control Technology of Cutting Roof and Retaining Roadway with Hard Roof

为了研究坚硬顶板沿空留巷巷道变形问题,通过理论分析与数值模拟相结合分析了坚硬顶板致灾可能性及其切顶留巷可行性,确定合理的切顶角度70°、切顶高度8 m,给出了针对切顶留巷的加强支护方法。实践表明:对沿空留巷实施切顶卸压及加强支护后,可有效控制巷道变形发展,有效保障了工作面安全高效回采。

In order to study the problem of the roadway deformation of gob-side retaining roadway with hard roof,the disaster possibility of hard roof and the feasibility of roof-cutting and retaining roadway are analyzed by the combination of theoretical analysis and numerical simulation,the reasonable roof-cutting angle of 70°and roof-cutting height of 8 m are determined,the strengthening support method for cutting roof and retaining roadway is given.The practice shows that the development of the roadway deformation can be effectively controlled and the safe and efficient mining of working face can be effectively guaranteed after the implementation of roof cutting pressure relief and strengthening support for gob-side retaining roadway.