高应力大断面巷道围岩加固技术研究

Study on Surrounding Rock Reinforcement Technology of High Stress Large Section Roadway

针对高应力大断面条件下的巷道围岩变形量大、变形速率快等问题,采用理论分析、数值模拟的方法对该类巷道的变形因素进行分析,并提出了支护方案。通过理论分析得到,巷道跨度及高应力是使巷道变形的重要因素,巷道跨度越大,巷道顶板垮落高度越大;巷道所处位置应力越大,越容易超过顶底板围岩所能承受的应力范围,从而造成剪切破坏,且向深部转移。针对原支护方案的不足,设计了新支护方案,并采用数值模拟的方法对2种支护条件下巷道围岩的应力、位移变化情况进行分析,得到新支护方案条件下,巷道围岩的位移情况有明显改善。最后将支护方案应用于现场,通过现场监测结果,巷道围岩变形量较小,控制效果较好。

Aiming at the problems of large deformation and fast deformation rate of roadway surrounding rock under the condition of high stress and large section,the deformation factors of this kind of roadway are analyzed by using the methods of theoretical analysis and numerical simulation,and the support scheme is put forward.Through theoretical analysis,it is found that roadway span and high stress are important factors for roadway deformation.The larger the roadway span is,the higher the roof collapse height is;the greater the stress of the roadway,the easier it is to exceed the stress range that the surrounding rock of the roof and floor can bear,resulting in shear failure and transfer to the deep.In view of the shortcomings of the original support scheme,a new support scheme is designed,and the changes of stress and displacement of roadway surrounding rock under the two support conditions are analyzed by numerical simulation.It is obtained that the displacement of roadway surrounding rock has been significantly improved under the condition of the new support scheme.Finally,the support scheme is applied to the field.Through the field monitoring results,the deformation of roadway surrounding rock is small and the control effect is good.