锚杆锚固下深部岩爆倾向巷道围岩承载层演化机理及特性分析

Analysis of the evolution mechanism and characteristics of the surrounding rock bearing layer in deep rock burst prone tunnels under anchor rod anchori

锚杆锚固下深部岩爆倾向巷道围岩承载层的演化机理及特性分析表明,围岩内部残余强度和剪胀扩容效应是主要影响因素。高残余强度使承载层厚度减小,提高围岩稳定性,降低变形量;而剪胀角越大,承载层厚度越大,围岩稳定性越差,变形量增大。增大支护阻力能够有效控制围岩变形,优化承载层结构,确保巷道的安全和稳定。

The evolution mechanism and characteristic analysis of the bearing layer of the surrounding rock in deep rock burst prone tunnels under anchor rod anchoring indicate that the residual strength and shear expansion effect inside the surrounding rock are the main influencing factors.High residual strength reduces the thickness of the bearing layer,improves the stability of the surrounding rock,and reduces deformation;The larger the shear dilation angle,the thicker the bearing layer,the poorer the stability of the surrounding rock,and the greater the deformation.Increasing the support resistance can effectively control the deformation of the surrounding rock,optimize the bearing layer structure,and ensure the safety and stability of the roadway.