穿越冲沟段浅埋偏压隧道洞口关键设计研究

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【中图分类号】：U455.6 【文献标志码】：A 【文章编号】：1008-3197（2025）03-17-05

【DOI编码】：10.3969/j.issn.1008-3197.2025.03.005

Study on Key Design of Shallow Buried Bias Tunnel Entrance Crossing Gully

WAN Zhiwen，ZHOU Jinqiang，YANG Xiong，JING Huaijun （Hunan Provincial Transportation Planning Surveyand Design InstituteCo.Ltd.，Changsha 41OOO8，China）

【Abstract】：Aiming at the problems such as shallow buried pressure，poor geology andrich groundwater when the tunnel crosses the gully section，based Shisaiao TunnelofNanbinHighway inGuangxi，the drainage methodof the tunnel entrance in thegulyarea was studied.Through hydrologiccalculationand analysis，the waterproof and drainage method at the tunnel portal was obtained.At the same time，the deformation of tunnel initial support structures and the selection of support parameters were analyzed and compared in diferent excavation methodsunder shallow buried bias pressre by numerical simulation.The results showed that the reserved core soil method had fewer construction processes，and better construction and deformation control.The shallow buried section in the gullat the tunnel entrance was excavated using the reserved core soil method；Auxiliary construction measures such as advanced large pipe shed，and grouting towards the inner diameter of the tunnel，the initial support is equipped with anchor，stee mesh，and I2Ob steelarches，secondary lining was reinforced with a 50 cm thick reinforced concrete lining structure are adopted.Based on on-site measurement andanalysis，the research on the waterproofing and drainage methods，excavation methods，and support types for shallow buried and bias tunnels crossing gullies can ensure construction and structural safety.

【Key words】： tunnel portal;gully;shallow buried bias；drainage method

随着我国公路建设的推进，受用地和选线的限制，隧道不可避免穿越浅埋冲沟等不利地形。（剩余4463字）