In the quest to explore suitable construction methods for large-scale soft rock tunnels under high ground stress,the Tong-zi Tunnel was used as an engineering background.Through on-site monitoring and numerical simulation,the suitability of three con-struction 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 suit-able.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.
关键词
高地应力隧道/特大断面/施工工法/数值模拟/适宜性
Key words
high ground stress tunnels/extra large cross-section/construction methods/numerical simulation/suitability
维普
万方数据