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王争瑞

 

(新郑市公路事业发展中心 , 新郑   451100)

摘  要: 为探究某城市道路隧道运营阶段的支护结构性能 , 通过 FLAC 3D 建立数值仿真模型 , 考虑流变与蠕变影响 , 引入强度折减法设定劣化系数 , 对岩体与支护参数进行折减分析 。研究不同劣化系数下 , 隧道支护结构的位移 、拉压应力分布及安全系数变化 。结果表明 : 随劣化系数增大 , 支护结构顶部 、底部开裂破坏风险增大 , 拱腰受压破坏可能性亦随之增加 , 拱腰安全性最低且底部安全性骤降 ; 建议运营阶段重点监测支护顶部、拱腰和底部 , 及时采取加固措施 , 以预防支护结构性能劣化速率过快 , 进而确保隧道运营安全。

关键词: 城市道路隧道 ; 运营阶段 ; 支护结构 ; 劣化分析 ; 数值模拟

中图分类号: U451      文献标志码: A      文章编号: 1005-8249 (2026) 04-0150-05

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 022

 

Analysis on Degradation Performance of Supporting Structure in

Operation Stage of Urban Road Tunnel

WANG Zhengrui

(Xinzheng City Highway Development Center, Xinzheng 451100, China)

Abstract : To investigate the performance of support structures during the operation of an urban road tunnel, a numerical simulation model was established using FLAC 3D, considering the effects of rheology and creep. Strength reduction methods were introduced to set degradation coefficients, and the rock mass and support parameters were analyzed through reduction. The study examined the displacement, tensile and compressive stress distribution, and safety factor changes of the tunnel support structure under different degradation coefficients.  The results indicate that with the increase of the degradation coefficient, the risk of cracking and failure at the top and bottom of the support structure increases, the possibility of compressive failure at the arch waist increases, the safety at the arch waist is the lowest, and the safety at the bottom drops sharply.  It is recommended that during the operation phase, the top, arch waist, and bottom of the support structure should be monitored closely, and reinforcement measures should be taken in a timely manner to prevent the rapid degradation of the support structure ’s performance, thereby ensuring the safety of tunnel operation.

Key words: urban road tunnels ; operation stage ; supporting structure ; degradation analysis ; numerical simulation