长江科学院院报2024，Vol.41Issue(4)：149-156,8.DOI:10.11988/ckyyb.20221391
碎裂岩夹层中大跨度悬索桥隧道锚稳定性分析
Stability of Tunnel Anchorage of Long-span Suspension Bridge in Fractured Rock Interlayer
摘要
Abstract
The stability of tunnel anchorage is a crucial factor in ensuring the safe operation of suspension bridges,as it forms an integral component of the structure.To investigate the load response behavior of tunnel anchorage in fractured rock interlayers of long-span suspension bridges,we have developed a three-dimensional numerical model.This model allows for a comprehensive evaluation of the stability of the tunnel anchorage,demonstrating its suitabil-ity and safety within fractured rock interlayers.Our findings highlight the significant impact of fractured rock inter-layers on the deformation of tunnel anchorage.Specifically,the displacement distribution curve of the rear anchor face and surrounding rock exhibits a distinct hump shape,with greater displacement on the left while smaller dis-placement on the right.Additionally,the interface friction resistance of the anchorage experiences abrupt changes within the fractured rock interlayer region.The failure of the anchorage-rock system commences from the vault area within the fractured rock interlayer,gradually propagating towards the arch waist and bottom until the plastic zone of the anchorage-rock interface is connected.Shear failure in the contact zone between anchorage and rock characteri-zes the failure mode.The bearing capacity of the tunnel anchorage is governed by the tensile failure of the steel bun-dles,with the comprehensive ultimate bearing capacity reaching 2.3 times the designed main cable force.Overall,the tunnel anchorage demonstrates favorable stability and applicability within fractured rock interlayers.关键词
隧道式锚碇/碎裂岩体/大跨度悬索桥/稳定性分析/数值模拟Key words
tunnel anchorage/fractured rock mass/large-span suspension bridge/stability analysis/numerical simulation分类
建筑与水利引用本文复制引用
张健,马建林,王钦科,苏伟..碎裂岩夹层中大跨度悬索桥隧道锚稳定性分析[J].长江科学院院报,2024,41(4):149-156,8.基金项目
国家重点研发计划项目(2016YFC0802203) （2016YFC0802203）
四川省自然科学基金项目(2023NSFSC0881) （2023NSFSC0881）
