厚硬顶板切顶沿空留巷围岩变形特征及演化规律研究

    Study on deformation characteristics and evolution law of wall rock in goaf retaining roadway with thick hard roof cutting

    • 摘要: 为保证晋圣亿欣煤业厚硬顶板工况下切顶留巷工作的顺利进行及沿空留巷巷道的安全使用,在对沿空留巷巷道上方关键岩梁的顶板结构受力进行理论分析的基础上,结合数值模拟方法对沿空留巷巷道沿工作面推进方向和巷道断面方向的应力及位移变化进行分析。结果表明:厚硬顶版切顶留巷过程可以划分为工作面超前区、成巷动压区、成巷稳定区,成巷动压区由于顶板关键岩梁的回转、下沉和破断而承载较高的应力和显著的围岩位移,成巷稳定区关键岩梁受到压实采空区支撑承载应力和围岩变形趋于稳定。应加强留巷顶板及靠近采空区侧顶板的支护强度,以保证留巷在使用期间的稳定性。

       

      Abstract: In order to ensure the smooth progress of goaf retaining work and safe use of goaf retaining roadway under thick and hard roof conditions in Jinsheng Yixin Coal industry, the stress and displacement changes of goaf retaining roadway along the advancing direction of working face and the section direction of goaf retaining roadway are analyzed based on the theoretical analysis of the roof structure stress of the key rock beam above the goaf retaining roadway. The results show that the process of cutting and retaining roadway with thick hard top plate can be divided into the leading zone of working face, the dynamic pressure zone of roadway formation and the stable zone of roadway formation. The dynamic pressure zone of roadway formation bears higher stress and significant displacement of surrounding rock due to the rotation, subsidence and breaking of key rock beam of roof, and the key rock beam of roadway stability zone tends to be stabilized by the supporting stress of compacting goaf and the deformation of surrounding rock. The supporting strength of the roof and the side roof near the goaf should be strengthened to ensure the stability of the roadway during use.

       

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