double sides wall pilot tunnel method

• 双侧壁导坑法

double sides wall pilot tunnel method的用法和样例：

例句

1. The numerical simulation of construction sequence was studied for shallow embedded bias tunnels with small clear distance using the method of double side excavation.
   采用双侧壁导坑法，对浅埋小净距双洞六车道偏压公路隧道在不同开挖顺序下进行施工力学数值模拟。