零埋深进洞在隧道施工中的应用

依托柞水至小河高速公路杨家湾隧道右线工程，针对隧道入口处围岩为强风化板岩，节理、裂隙发育、岩体破碎、围岩稳定性差等特点，提出“零埋深进洞”，即“零开挖”的设计、施工理念。即按“早进洞、晚出洞”的原则，最大限度地缩小洞口施工对自然边仰坡原始植被的破坏程度，稳定边仰坡美化环境。工程实践证明，所提方法对于隧道洞口围岩条件较差的情况是比较适合的。

Zero Depth at Entrance in Tunnel Construction

Based on the right line project of Yangjiawan Tunnel of Zhashui-Xiaohe Express Highway,in view of the characteristics of the heavily weathered surrounding rock at the entrance,such as jointing,crack,broken mass and low stability,this paper brings forward the concept zero depth at entrance,or zero excavation.According to the principle of early entering and late exiting,this method tries to reduce the damage to the original vegetation on the slope and stabilize the slope to protect the environment.The practic...