极浅埋连拱隧道中隔墙受力特征模型试验研究  

Model Test Study on Deformation and Mechanical Behavior of the Middle Wall in an Extremely Shallow Double-Arch Tunnel

作　　者：袁树成 YUAN Shucheng(China Railway 14th Bureau Group Second Engineering Co.,Ltd.,Taian 271000,China)

机构地区：[1]中铁十四局集团第二工程有限公司,泰安271000

出　　处：《现代交通技术》2018年第5期31-35,共5页Modern Transportation Technology

摘　　要：中隔墙是连拱隧道的主要承载结构,保护中隔墙免受偏压影响并维持其稳定性是保证连拱隧道施工安全的关键。以某极浅埋连拱隧道为例,采用模型试验的方式对中隔墙在左右洞交替开挖过程中的受力特征进行模拟,得到了中隔墙底部压力的变化规律,并利用改进的中隔墙稳定性判断公式对中隔墙的稳定性进行了验算,解释了模型试验的结果,并提出了加强中隔墙稳定性的措施。As the middle wall is the main bearing structure of a double-arch tunnel, to prevent harmful influence by unsymmetrical pressure on it and guarantee its stability throughout the construction process is the key to ensure the safety of the doublearch tunnel construction. Based on the construction of an extremely shallow buried doublearch tunnel, model test has beencarried out to analyze the stress characteristics during the alternate excavation of the twin tunnels. And the evolution law of thebottom pressure of the middle wall is obtained. Then the improved formula to determine the stability of the middle wall was applied to check the stability of the middle wall and explain the model test results. Finally, targeted measurements are recom-mended to strengthen the stability of the middle wall.

关 键 词：连拱隧道 中隔墙 受力特征 模型试验 

分 类 号：U451.5[建筑科学—桥梁与隧道工程]