“盖挖法”在超小净距大跨隧道洞口滑坡中的应用  

Application of Cover-Cut Method to Excavation of Super-Neighborhood and Long Span Tunnel Landslide at Portal

作　　者：周恒[1] 陈浩[1] 林晨[1] 

机构地区：[1]江苏省交通规划设计院股份有限公司,南京市210005

出　　处：《公路》2013年第4期221-225,共5页Highway

摘　　要：针对大跨隧道洞口段埋深浅、超小净距及滑坡的工程难点和特点,结合相似工程经验和地铁"盖挖法"设计与施工原理,与传统的明挖法施工方案进行多方面详细比选。分析结果表明,"盖挖法"是最佳的施工加固方案,能够很好地治理洞口滑坡,确保隧道正常进洞;同时也能确保中岩墙的稳定和强度,降低左右洞施工的相互影响及减少对洞口生态环境的破坏,为类似工程情况提供了新的设计思路和借鉴作用。Based on the characteristics that the long span tunnel＇s portal section buries shallow, superneighborhood and landslide at the portal, combined with the similar engineering experience and Metro Cover-Cut Method design and construction principle, scheme comparison and selection of construction with traditional open-cut is executed. The analysis results show that cover-cut method is the best construction and reinforcement method as treatment of landslide at the portal and safety into the hole can be ensured, meanwhile the stability and strength of interval pillar can be ensured, the influence of two holes construction and the damage of environment at the portal of the tunnel are both reduced, new idea of design and reference effect is provided for similar cases.

关 键 词：盖挖法 超小净距 大跨隧道 洞口滑坡 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]