The opening of the left entrance of Wohushan Tunnel is located on the mountainside,with steep hill and close to the bridge site of 5 marks. Due to the direction of the line and site restrictions,the tunnel entrance is connected with the bridge and the tunnel,and the terrain is steep,which is not convenient for direct tunnel entry. On the premise of meeting the requirements of the construction period,the construction scheme of unidirectional excavation from the left exit to the entrance is determined,and then the left side of the entrance is used to advance the tunnel exit first. The core soil is reserved for the uphill slope brushing,which is convenient for arch sleeve,pipe shed,reinforcement of the surrounding rock of the tunnel entrance section,excavation of the tunnel body by double-sided guide pit method,loose hydraulic blasting,ensuring construction safety,solving the problem that the entrance is not easy to enter directly.
Fujian Architecture & Construction
Top pilot tunnel