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铣挖法作为近年来兴起的一种新型隧洞施工方法,在软岩隧洞开挖中具有施工安全性好、操作方便、有效的控制超欠挖等优势,目前已在我国铁路、公路、城市建设等领域的隧洞开挖中逐步得到推广应用,但在水利水电工程隧洞开挖中的应用则较少。对玉瓦水电站工程引水隧洞V类围岩洞段运用铣挖机开挖的经验进行了总结,对类似工程的施工具有一定的借鉴价值。
As a new type of tunnel construction method emerging in recent years, milling excavation has the advantages of good construction safety, convenient operation and effective control of overbreak and underbreak in soft rock tunnel excavation. At present, it has been used in the construction of railways, highways and cities in our country And other areas of the tunnel excavation has been gradually applied, but in the water conservancy and hydropower engineering tunnel excavation is less applied. This paper summarizes the experience of excavation of V type surrounding rock of diversion tunnel of Yuva hydropower project, and has certain reference value for the construction of similar projects.