山岭隧道进洞方案比选与下穿地方道路技术研究

Comparison and Selection of Entrance Schemes into Mountain Tunnels and Technical Research on Underpassing Local Roads

山岭隧道进洞方案多样,如何结合洞口的工程地质、结构形式、周边环境及与洞外道路关系等特点,合理选择进洞方案,既可确保进洞安全施工、缩短工期,又可降低工程成本。黄楼隧道进洞方案从安全、进度、施工难度和地方关系处理等角度进行研究与比选,最终选择下穿地方道路方案,即保持地方原道路不变,采用明洞接长,将隧道暗洞延长至地方道路以外,洞顶与地方路相交部分进行地表注浆,洞口施作双层大管棚,施工期间采取交通限行措施。这一方案不需另外征地修建新的地方道路,缩短了施工工期,整体上节约了工程造价。

There are various schemes for tunnel entry in mountain tunnels.According to the characteristics of engineering geology,structural form,surrounding environment and road relationship outside the tunnel,reasonable selected the scheme of entering the tunnel can not only ensure the safe construction of the tunnel and shorten the construction period,but also reduce the engineering cost.The entering scheme of Huanglou tunnel is studied and compared from the perspectives of safety,progress,construction difficulty and local relation treatment.Final choice scheme is underpassing the local road.That is,the original local road is kept unchanged,the open tunnel is extended to the outside of the local road,grouting is carried out on the surface of the intersection part of the tunnel roof and the local road,large double-layer pipe shed is constructed at the entrance of the tunnel,and traffic restriction measures are taken during construction.This scheme does not require additional land acquisition to build new local roads,thus shortening the construction period and saving the project cost as a whole.