红枫连拱隧道开挖稳定性分析

通过对金丽温高速公路红枫连拱隧道工程地质特征的现场调查和理论分析，系统地研究了该隧道开挖及加固全过程的围岩应力场、变形场和塑性破坏区的状况及变化特征．结果表明：红枫连拱隧道围岩应变率较低，围岩衬砌后位移值变化量很小；按衬砌类型，围岩变形基本满足稳定要求；围岩的拉应力随着隧道开挖面的扩大而逐渐变大，除局部位置外，衬砌基本满足抗拉要求．

Stability analysis of excavation of Hongfeng multiple arch tunnel

Based on field investigation and theoretical analysis of geological characteristics of the Hongfeng multiple arch tunnel of the Jinliwen Highway, the current situation and variation characteristics of the stress field, deformation field and plastic failure zone of surrounding rock during the excavation and strengthening of the tunnel were analyzed. The results show that the strain rate and the displacement of surrounding rock are low during excavation, and that the deformation of surrounding rock with the liner currently used meets the requirement of stability. It is also indicated that the tensile stress in surrounding rock increases with the extension of the excavated area, and the tensile strength of the liner is satisfactory except at some positions.