岩石流变特性是造成巷道围岩变形的重要因素。为了描述圆形巷道围岩的流变特性假设围岩本构模型为Burgers模型和统一强度准则组合的黏-弹塑性模型。考虑中间主应力系数和支护反力的影响通过弹性应变方程引入时间特性推导出了巷道围岩蠕变位移解析解。结合算例分析了中间主应力和支护反力对巷道围岩塑性区半径及其应力场和位移场的影响以及位移场随时间的变化规律。结果表明：通过增大中间主应力和支护反力可以减小塑性区半径

The rheological characteristics of rock mass are important factors causing deformation of tunnel surrounding rock. In order to describe the rheological characteristics of circular tunnel surrounding rock, the constitutive model of rock mass is assumed to be a visco-elasto-plastic model combining the Burgers model and the unified strength criterion. Considering the influence of intermediate principal stress coefficient and support force, the creep displacement analytical solution of tunnel surrounding rock is derived through the elastic strain equation, with the introduction of time characteristics. Combined with the numerical analysis, the influence of intermediate principal stress and support force on the plastic zone radius of tunnel surrounding rock, as well as the stress and displacement fields, is analyzed. The variation law of displacement field with time is also studied. The results show that increasing the intermediate principal stress and support force can reduce the plastic zone radius and rock mass displacement, and improve the stability of tunnel surrounding rock. With the increase of time, the deformation of rock mass gradually increases. However, by increasing the support force, the deformation rate of rock mass can be effectively suppressed, which alleviates the deformations to a certain extent