基于内外承载结构的软岩巷道围岩控制技术研究

Research on surrounding rock control technology of soft rock roadway based on internal and external bearing structure

为解决采动影响下赵固二矿14030工作面回风巷软岩巷道围岩变形显著问题,本文采用钻孔窥视仪探测了围岩变形破坏规律,提出了软岩巷道主动式围岩加固控制技术,针对巷道参数设计了注浆锚索加强支护方案,并通过现场监测验证围岩变形控制效果。研究结果表明:随着扰动程度加深,浅部围岩的松散破碎范围不断扩大,难以形成有效的承载结构,深部围岩离层裂隙发育高度进一步增高;以提升浅部围岩的承载能力为出发点,通过增强内承载结构的支护强度及围岩自身抗扰动能力,可发挥出内外承载结构和支护体共同的围岩变形控制作用;在锚索力学性能允许承受载荷范围内,适当提高预紧力及加长注浆锚索长度可改善巷道围岩变形控制效果。

In order to solve the significant problem of surrounding rock deformation of 14030 upper gateway soft rock roadway under the influence of mining in Zhaogu No.2 Coal Mine, the borehole peeper is used to detect the deformation and failure law of surrounding rock.According to the failure characteristics of surrounding rock of mining soft rock roadway, the control countermeasures are put forward, the active surrounding rock reinforcement control technology of soft rock roadway is put forward, and the grouting anchor cable strengthening support scheme is designed according to the roadway parameters, the control effect of surrounding rock deformation is verified by field monitoring.The results show that with the deepening of disturbance, the loose and broken range of shallow surrounding rock is expanding, and it is difficult to form an effective bearing structure, and the development height of separation fracture of deep surrounding rock is further increased.In order to improve the bearing capacity of the shallow surrounding rock, by enhancing the support strength of the internal bearing structure and the anti disturbance ability of the surrounding rock itself, the common deformation control function of the internal and external bearing structure and the support body can be played;within the allowable load range of the mechanical properties of the anchor cable, properly increasing the preload and lengthening the length of the grouting anchor cable can improve the deformation control effect of the surrounding rock.