管索组合结构支护新技术及其在深部大变形巷道应用研究

随着煤矿开采深度的增加，巷道围岩应力环境恶化，围岩大变形及锚杆锚索破断问题更加突出，严重影响深部矿井生产安全。为了解决此类问题，本文针对锚杆锚索支护的优点及缺陷，基于管索组合结构与围岩相互作用机理，提出了管索组合结构支护新技术。管索组合结构通过改善锚索自由段结构、优化其受力状态，使锚索具备较高轴向承载力，同时能够防止受岩石错动等横向作用而导致的锚索自由段破断，避免围岩失稳。通过室内剪切试验发现，管索组合结构的最大剪切荷载为普通锚索的1.27倍以上，平均最大剪切位移为普通锚索的1.16倍，表明管索组合结构具有良好的抗剪能力和剪切方向延展特性。基于九龙矿巷道的工程案例，通过现场监测和钻孔探测，分析了原支护方案下巷道的变形破坏特征，并将管索组合结构在深部大变形巷道进行了应用，现场监测结果表明，采用管索组合结构支护新技术能够有效控制围岩大变形。研究结果可为类似深部矿井支护提供参考。

Research on the new technology of anchor cable with C-shaped tube support and its application in deep large deformation roadway

With the increase of coal mining depth, the stress environment of the surrounding rock of the roadway deteriorates, therefore it becomes a prominent problem for the large deformation of the surrounding rock and the breaking of the bolt and cable, which seriously affects the safety of deep mine production.To solve such problems, this paper focuses on the advantages and disadvantages of bolt and cable support.Based on the interaction mechanism between Anchor Cable with C-shaped tube(ACC)and surrounding rock, this paper proposed a new ACC support technology.ACC optimizes the stress state by improving the structure of the free section of the anchor cable.It can not only enhance the anchor cable's axial bearing capacity but also prevent the free section of the anchor cable from breaking due to lateral action.It can avoid the problem of instability of surrounding rock.Through the shear test, it is found that the maximum shear load of the ACC is more than 1.27 times that of the ordinary anchor cable, and the average maximum shear displacement is 1.16 times that of the ordinary anchor cable, which indicates that the ACC has good shear resistance and shear direction extension properties.Based on the engineering case of the roadway of Jiulong Mine, this study analyzes the deformation and failure characteristics of the roadway under the original support scheme through on-site monitoring and borehole detection, and has successfully applied the ACC in the deep large-deformation roadway.The field monitoring results show that the new technology of ACC can effectively control the large deformation of surrounding rock.The results of this study can provide reference for similar deep mine support.