关键词: 围岩变形, 岩石蠕变, 统一强度理论, 中间主应力, 弹塑性理论

Abstract: Considering the influence of creep and intermediate principal stress, based on the viewpoint and the unified strength theory that the peak stress of surrounding rock should be the long-term strength of rock under a certain confining pressure after roadway deformation stabilization, and considering the strain softening and capacity expansion characteristics of the post-peak stage of surrounding rock, the elastic-plastic analytical solution of surrounding rock deformation partition is obtained.Finally, the influence of creep and intermediate principal stress on the distribution range of stress, displacement and plastic zone in surrounding rock is analyzed by an example.The results show that when the influence of creep is ignored, the theoretical analysis results of the bearing capacity of the surrounding rock are seriously larger, and the theoretical analysis results of the displacement of the surrounding rock and the distribution range of the plastic zone are seriously smaller due to the non-creep deformation.The intermediate principal stress can obviously inhibit the deformation of surrounding rock and the expansion of the plastic zone. The strength criterion without intermediate principal stress is helpful to eliminate the negative effects of ignoring creep characteristics.