为探索高地应力特大断面软岩隧道的适宜施工方法，以桐梓隧道为工程背景，通过现场监测和数值模拟，探索不同高地应力下的3种施工工法[三台阶、CD（cross diaphragm）法、双侧壁导坑法]的适宜性，从围岩变形、施工成本以及施工进度等方面评价施工方法的优劣。结果表明：Ⅴ级围岩：当隧道埋深为300、400 m时，适用三台阶法施工；当埋深为500 m时，适用CD法施工；当埋深为600 m时，适用双侧壁导坑法施工。Ⅳ级围岩：当隧道埋深为300 ~ 600 m时，都适用三台阶法施工。

In the quest to explore suitable construction methods for large-scale soft rock tunnels under high ground stress, the Tongzi Tunnel was used as an engineering background. Through on-site monitoring and numerical simulation, the suitability of three construction techniques [three-step method, cross diaphragm (CD) method], double-side wall guiding pit method) under different high ground stresses were explored. The merits and demerits of construction methods were evaluated based on aspects such as surrounding rock deformation, construction cost, and construction progress. The results show for level Ⅴ surrounding rock when the tunnel buried depth is 300 m to 400 m, the three-step method is applicable. When the buried depth is 500 m, the Cross Diaphragm method is suitable. When the buried depth is 600 m, the double-side wall guiding pit method is applicable. For level Ⅳ surrounding rock, when the tunnel buried depth is between 300 m to 600 m, the three-step method is applicable in all cases.