近接旧桥锚碇的非对称隧道式锚碇稳定性分析  

Stability Analysis of Asymmetric Tunnel Anchorage Adjacent to Old Bridge Anchorage

作　　者：马坤 MA Kun(Guizhou Transportation Planning Survey&Design Academe Co.,Ltd.,Guiyang 450001,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《交通科技》2025年第1期55-59,共5页Transportation Science & Technology

基　　金：贵州省交通运输厅重大科技攻关项目(2023-122-025)资助。

摘　　要：非对称设计的隧道锚力学行为复杂,既有应用案例及研究较少,因此对其开展针对性研究。以德兴大桥新桥隧道锚为依托,研究围岩稳定性、抗拔稳定性,以及对旧桥隧道锚的影响,文中通过三维数值模型分析发现,右幅后行洞的开挖对左幅先行洞影响较小;新隧道锚对旧隧道锚的承载力影响非常小;在6倍超载系数范围内,新桥隧道锚围岩仍具备较高的安全储备。The mechanical behavior of tunnel anchors with asymmetric design is complex,and there are few application cases and studies available.Therefore,targeted research is particularly necessary.In order to study the stability and anti-pull stability of the surrounding rock of the new bridge tunnel anchor,as well as its impact on the anchor of the old bridge tunnel,a three-dimensional numerical model of the tunnel anchor is established and numerical analysis is conducted,based on the anchor of the new bridge tunnel of Dexing Bridge.The analysis results indicate that the excavation of the right rear tunnel has a relatively small impact on the left front tunnel.The impact of the new tunnel anchor on the bearing capacity of the old tunnel anchor is very small.Within the range of 6 times the overload factor,the anchor rock of the new bridge tunnel has a high safety reserve.

关 键 词：悬索桥 隧道式锚碇 围岩稳定性 抗拔稳定性 

分 类 号：U443.24[建筑科学—桥梁与隧道工程]