基于钢管混凝土支架的复合支护技术在断层破碎带巷道中的应用研究

Application research of composite support technology based on concrete-filled steel tube support in roadway of fault fractured zone

以阳城煤矿-650 m南翼轨道大巷为研究对象,深入分析了断层破碎带巷道地质参数,揭示了原有支护条件下巷道的变形破坏机理,基于承压环强化支护理论提出基于钢管混凝土支架的复合支护设计方案,在巷道内形成硬壳支护层。以有限元软件FLAC3D分析复合支护体受力性能,浅底拱圆形钢管混凝土支架最大轴力1914 kN,最大弯矩73.64 kN·m,出现在顶弧段左肩,支架极限受力在允许范围以内,满足支护稳定要求。-650 m南翼轨道大巷采用复合支护设计后支护结构稳定,巷道变形量小,表明基于钢管混凝土支架的复合支护设计适合断层破碎带巷道支护。

Taking -650 m South Wing track roadway at Yangcheng Mine as the research object, the geological parameters of the roadway in fault fractured zone were analyzed in depth, the deformation and failure mechanism of the roadway under the original support conditions was revealed, and based on the theory of reinforced support with pressure ring, a composite support design scheme based on concrete-filled steel tube composite support was proposed, which forms a hard shell support layer in the roadway.Finite element software FLAC3D was used to analyze the mechanical performance of composite support.The maximum axial force and bending moment of circular steel tube support with shallow bottom arch were 1914 kN and 73.64 kN·m, which appeared on the left shoulder of the top arc section.The ultimate force of the support was within the allowable range and met the support stability requirements.The support structure of -650 m South Wing track roadway was stable and the deformation of roadway was small after using composite support design.It showed that the composite support design based on concrete-filled steel tube support was suitable for roadway support in fault fractured zone.