临海超大断面连拱隧道支护体系优化研究  

Study on Optimization of Support System of Super Large Section Multi-Arch Coastal Tunnel

作　　者：郭彦兵[1] GUO Yanbing(China Railway 18th Bureau Group Co.Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《铁道建筑技术》2025年第3期158-161,共4页Railway Construction Technology

基　　金：福建省交通运输科技项目(202106)。

摘　　要：厦门第二西通道工程是集难度和技术含量于一体的临海超大断面双连拱隧道,对该双连拱隧道支护体系的力学行为进行分析,经数值模拟,发现钢拱架间距和钢拱架型号对隧道稳定性有明显影响;在确保隧道结构的安全性、围岩的稳定性,并考虑经济效益的情况下,确定了支护参数最优采用I25a工字钢、间距50 cm,并对结构的安全性进行了理论验证;通过对现场监测数据与数值模拟进行比较,结果基本一致,反映了双连拱隧道初支体系优化后开挖时支护结构的稳定性,可为类似工程优化设计提供借鉴。The Second West Passage Project of Xiamen is a double-arch tunnel with large section facing the sea,which combines difficulty and technical content.The mechanical behavior of the double-arch tunnel supporting system is analyzed in this paper.Through numerical simulation,it is found that the steel arch spacing and steel arch type have obvious influence on the tunnel stability.In order to ensure the safety of tunnel structure,the stability of surrounding rock,and considering the economic benefits,the optimal supporting parameters are determined to use I25a I-steel with a spacing of 50 cm,and the safety of the structure is verified theoretically.By comparing the field monitoring data with the numerical simulation,the results are basically consistent,which reflects the stability of the support structure of the double-arch tunnel after the initial support system optimization,and can provide reference for the optimization design of similar projects.

关 键 词：临海隧道 超大断面 支护结构 有限元 优化设计 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]