山岭隧道洞口段桥隧相接工程技术研究

Research on Engineering Technology of Tunnel Immediately Adjacent to Bridge at Mountain Tunnel Entrance

公路桥隧相接的结合型式采用桥梁伸入隧道设计方案,通过设置枕梁和增大明洞净空高度的措施确保结构稳定,减少隧道洞口大开挖,避免洞口边仰坡失稳滑塌、生态环境破坏;对于桥梁桥台与隧道洞门距离较近路段采用短路基相接,并采用填石路堤结合路基冲刷防护保证短路基稳定安全,通过施工技术控制确保施工质量,对山区公路设计和施工具有借鉴作用。

The design scheme for bridge stretching into tunnel is adopted for binding pattern of tunnel immediately adjacent to highway bridge. The stability of structure is guaranteed through taking measures for setting up bridge and increasing open- cut tunnel clear height,so as to reduce heavy excavation of tunnel entrance,and avoid instable collapse of side upward slope around tunnel entrance and destruction of ecological balance. Short subgrade connecting is adopted for the section of bridge abutment near tunnel entrance,and rock- fill embankment with subgrade scour protection is adopted,so as to guarantee the stability and safety of short subgrade. The construction quality is guaranteed through construction technology control,thus providing reference for mountain highway design and construction.