金川隧道零开挖出洞单向贯通施工技术

结合金川隧道出洞口工程特点,介绍了对出口洞门工程的优化设计方案,针对施工难点,从超前支护,洞身开挖,洞口工程施工三个主要工序上阐述了该工程洞口段防止塌方的施工方法,为同类隧道工程提供了宝贵经验。

Unidirectional coalescence construction technology without excavation launching shaft of Jinchuan tunnel

Combining with the features of launching shaft entrance project of Jinchuan tunnel,the thesis introduces the optimization design plan of exit and cave door.Aiming at the constructional difficulties,it illustrates the construction methods for preventing collapse of entrance section of this project from three main procedures： advanced support,excavation of the cave body,cave entrance project construction,which provides precious experience for the same kind of tunnel projects.