市政技术2024，Vol.42Issue(6)：60-67,8.DOI:10.19922/j.1009-7767.2024.06.060
循环进尺对隧道洞口段施工动态稳定性影响研究
Study on the Influence of Cycle Footage on the Dynamic Stability of Tunnel Portal Section Construction
摘要
Abstract
During the construction process,it is important to study the interaction and failure mechanism between tunnel and surrounding rock to maintain the stability of the structure.The calculation model of Luohanshan tunnel in Fuzhou,Fujian Province was established by finite element software.The displacement and plastic zone development of surrounding rock and structure were discussed.Based on the strength reduction method,the dynamic safety factor changes of the tunnel model considering the front section and different advance per round were analyzed.Through the analysis,it is found that the main cause of failure is the development of the surrounding rock of the tunnel en-trance and the plastic zone of the slope.After the connection of the plastic zone,the slope appears to be unstable,and then the load and deformation are transferred to the tunnel structure;The strength reduction method is used to obtain the safety factor under different cyclic penetration,the smaller the cyclic penetration,the higher the slope stability of tunnel entrance section.The research results can provide theoretical basis for the construction stability estimation and instability prediction in tunnel entrance section.关键词
隧道/洞口段/循环进尺/稳定性/强度折减法/安全系数Key words
tunnel/entrance section/advance per round/stability/strength reduction method/safety factor分类
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李文涛,赵旭,郭飞,陶连金,黎若寒..循环进尺对隧道洞口段施工动态稳定性影响研究[J].市政技术,2024,42(6):60-67,8.基金项目
国家重点研发计划"高山峡谷工程区复合链生灾害风险推演关键技术"项目(2022YFC3004300) （2022YFC3004300）
