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现行公路隧道和水工隧洞设计施工规范中,尚无明确的小净距隧洞的设计施工规程。坝陵河大桥的隧道锚位于贵州典型的喀斯特地区,岩溶非常发育,与同类工程相比隧洞成洞规模大。结合坝陵河大桥隧道锚的隧洞开挖过程数值分析,对大倾角、变截面、小净距的隧道锚成洞开挖顺序、爆破开挖,特别针对中间岩墙的支护等关键技术问题进行了深入研究,可以为今后类似工程提供借鉴和参考。
Current highway tunnel and hydraulic tunnel design and construction specifications, there is no clear design and construction of small clear-cut tunnel rules. The tunnel anchor of Baling River Bridge is located in the typical karst area of Guizhou. Karst development is very well. Compared with other similar projects, tunnel tunnels are large in scale. Combined with the numerical analysis of the tunnel excavation process of tunnel anchor in Balinghe River Bridge, the key technical problems such as the excavation sequence of large tunnels with large dip angle, variable section and small clear distance, blasting and excavation, especially for the support of intermediate rock walls In-depth study, can provide reference for similar projects in the future.