基于统一强度理论的深埋圆形岩石隧道收敛限制分析

基于统一强度理论和非关联流动法则，考虑中间主应力、围岩软化、剪胀和塑性区较小弹性模量等综合影响，推导了深埋圆形岩石隧道围岩特征曲线解析新解。采用较合理的 Vlachopoulos 公式确定隧道纵向位移释放系数，利用收敛限制法对比两种支护起始位置方法下支护压力的差异。研究结果表明：统一强度理论参数对围岩特征曲线和隧道纵向变形曲线的影响显著，考虑中间主应力效应可以更加充分发挥围岩的强度潜能，塑性区弹性模量和剪胀参数对围岩特征曲线的影响显著，不同支护起始位置方法确定的支护压力差异明显。

Convergence-confinement analysis of deep circular rock tunnels based on unified strength theory

Based on the unified strength theory and a non-associated flow rule,a new analytical solution for ground reaction curve of a deep circular rock tunnel is presented taking into consideration the integrated effects of the intermediate principal stress,rock softening,dilatancy and a small Young’s modulus in the plastic zone.The Vlachopoulos’s formula due to its rationality is adopted to determine the relief ratio of longitudinal deformation of the tunnel.The support pressure differences anticipated from the convergence-confinement analysis between two methods for determining the initial location of support action are discussed.The results show that the influence of the unified strength theory parameter on the ground reaction curve and longitudinal deformation profile of the tunnel is significant.The strength potentials of rock mass are better achieved due to considering the effect of the intermediate principal stress.The effects of Young’s modulus in the plastic zone and dilatancy on the ground reaction curve are important.The differences of support pressure between two methods for determining the initial location of support action are remarkable.