东曲矿矸石充填开采沿空留巷围岩稳定性控制技术研究

Research on Stability Control Technology for Surrounding Rock of Gob Retaining Roadway in Dongqu Mine with Gangue Filling Mining

随着矿井采掘深度不断延伸,在深部沿空留巷时复杂的地质条件易导致围岩被破坏,增加围岩控制难度。采用矸石充填采空区可有效限制深部采场覆岩大范围的破断、运动,缓解深部工作面剧烈的矿压显现,为深部工作面沿空留巷奠定基础。通过现场实测和理论计算,分析了深部矸石充填工作面覆岩运动特征,探讨了沿空留巷围岩承载结构及其稳定性,并以东曲矿28802工作面为工程背景,设计了以矸石墙+钢管混凝土立柱为主的巷旁支护结构,提高了矸石墙承载能力,保证工作面安全开采。

With the continuous extension of mining depth in mines,the complex geological conditions of retaining tunnels along the goaf in deep areas can easily lead to the destruction of surrounding rock,increasing the difficulty of surrounding rock control.The use of gangue to fill the goaf can effectively limit the large-scale breakage and movement of the overlying rock in deep mining areas,alleviate the severe mining pressure in deep working faces,and lay the foundation for retaining roadways along the goaf in deep working faces.Through on-site measurement and theoretical calculation,the movement characteristics of the overlying rock in the deep gangue filling working face were analyzed,and the bearing structure and stability of the surrounding rock along the goaf were discussed.Taking the No.28802 working face of Dongqu Mine as the engineering background,a roadway side support structure mainly consisting of gangue walls and steel pipe concrete columns was designed to improve the bearing capacity of the gangue walls and ensure safe mining of the working face.