中文摘要：

为了给隧道新奥法的设计与施工提供参考,针对隧道开挖引起围岩扰动随距离的渐进性变化,建立了半径相关的塑性区弹性模量计算式,并结合塑性区弹性应变的3种定义,获得了围岩特征曲线的理论新解答,进而探讨了围岩塑性区变形特性对代表性硬岩和软岩隧道收敛约束的影响规律。结果表明：半径相关的塑性区弹性模量和不同弹性应变定义对围岩稳定变形均有显著影响,且其影响程度与中间主应力效应密切相关,但对支护压力的影响却很小;基于半径相关的塑性区弹性模量得到的围岩特征曲线和稳定变形处于较小弹性模量上限、常弹性模量下限之间,应优先选用由广义胡克定律确定的塑性区弹性应变第3定义;所得围岩特征曲线新解是真正的理论解析解,综合反映了多种因素特别是围岩塑性区变形特性的共同影响。

英文摘要：

To provide references for design and construction of the New Austrian Tunneling Method,a radius-dependent elastic modulus（RDM）formula in the plastic zone was proposed considering progressive disturbances change of surrounding rock with distance due to tunnel excavation.A new theoretical solution of surrounding rock reaction curve was presented combined with three definitions for elastic strains in the plastic zone.The influences of deformation characteristics of surrounding rock in the plastic zone on the tunnel convergenceconfinement with typical hard and soft rocks were investigated.The results show that the influences of the RDM model in the plastic zone and different definitions for elastic strains on the stable deformation of surrounding rock are remarkable,whose extent is closely related to the intermediate principal stress effect but has little impact on the support pressure.The surrounding rock reaction curve and stable deformation calculated by the RDM model are between the upper bound of smaller elastic modulus and the lower bound of constant elastic modulus,and the third definition for elastic strains adopting the generalized Hooke＇s law in the plastic zone is preferred.The new result of surrounding rock reaction curve is a true theoretical and analytical solution,which reflects the common effects of many factors,particularly for deformation characteristics of surrounding rock in the plastic zone.