隧道钢管混凝土复合结构力学性能研究  

Study on Mechanical Properties of Tunnel Concrete Filled Steel Tube Composite Structure

作　　者：黄震 HUANG Zhen(China Railway 14th Bureau Group Ist Engineering Development Co.Ltd.,Rizhao Shandong 276800,China)

机构地区：[1]中铁十四局集团第一工程发展有限公司,山东日照276800

出　　处：《铁道建筑技术》2024年第12期178-181,206,共5页Railway Construction Technology

基　　金：中国国家铁路集团有限公司科技研究开发计划项目(K2021G021);中国铁建股份有限公司科技研究开发计划项目(2020-B04)。

摘　　要：隧道复合支护体系常采用钢拱架、纵向连接筋及喷射混凝土的组合方式作为支护手段。依托广东省汕头湾海底隧道,通过有限元数值模拟软件对方钢管混凝土强度、拱架组合间距及纵向连接筋直径对拱架受力特性的影响进行研究,分析不同支护方案下荷载-位移曲线。研究结果表明:(1)混凝土强度提升显著增强了构件在弹性阶段及开裂阶段的强度,尤其是在弹性阶段,强度增强显著;(2)拱架组合间距减小显著增强了构件在弹性阶段及开裂阶段的强度,可有效优化应力分布;(3)随连接筋直径增大,构件屈服荷载增加缓慢,对构件承载力提升效果并不显著。Steel arch frame,longitudinal connecting bar and shotcrete are often used in tunnel composite support system as some means of support.Based on Shantou Bay Subsea Tunnel in Guangdong,the influence of the strength of square steel tube concrete,the spacing between arch combinations,and the diameter of longitudinal connecting bars on the stress characteristics of the arch was studied through finite element numerical simulation software,and the load-displacement curves under different support schemes were analyzed.The research results show that:(1)the improvement of concrete strength significantly enhances the strength of the component in the elastic and cracking stages,especially in the elastic stage,where the strength enhancement is significant;(2)the reduction of the space between the arch combinations significantly enhances the strength of the elastic section and the cracking section of the members,and can effectively optimize the stress distribution;(3)with the increase of the diameter of the connecting bars,the yield load of the members increases slowly,and the bearing capacity of the members does not increase significantly.

关 键 词：复合支护 混凝土强度 拱架间距 钢筋直径 力学性能 数值分析 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]