束合管幕结构侧部卸载工况下受力性能足尺试验研究  

Full-scale Experimental Study on Mechanical Behavior of the Bundled Integrate Structure under the Unloading Condition of the Side

作　　者：毕湘利[1] 王秀志[1] 张中杰 潘伟强 焦伯昌 柳献[4] BI Xiangli;WANG Xiuzhi;ZHANG Zhongjie;PAN Weiqiang;JIAO Bochang;LIU Xian(Shanghai Shentong Metro Co.,Ltd.,Shanghai 201102;Shanghai Urban Construction Design&Research Institute,Shanghai 200125;Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200032;Department of Geotechnical Engineering,Tongji University,Shanghai 200092)

机构地区：[1]上海申通地铁集团有限公司,上海201102 [2]上海市城市建设设计研究总院(集团)有限公司,上海200125 [3]上海隧道工程有限公司,上海200032 [4]同济大学地下建筑与工程系,上海200092

出　　处：《现代隧道技术》2022年第5期163-169,187,共8页Modern Tunnelling Technology

基　　金：上海市优秀学术/技术带头人计划(20XD1432500).

摘　　要：为研究束合管幕结构的力学性能和受力薄弱点,开展了四分之一结构的足尺试验,保持顶部4倍设计埋深对应荷载不变,进行侧部的卸载工况研究。结果表明,随上部与侧部荷载差值的增大,侧部结合缝脱开、结构变形及预应力筋应变增速均显著增加;侧部完全卸载后,结构有明显变形,但仍具备一定的承载能力;整个试验过程中,结构刚度变化为先降低再增大最后大幅降低,最终为初始刚度的36%。In order to study the structural mechanical properties and weak points of the bundled integrate structure,a full-scale test on the quarter structure had been conducted.The unloading condition of the side was studied by keeping the top load corresponding to 4 times of the design buried depth.The results showed that:(1)With the increase of the load difference between the upper and the side,the joint at the side was detached,the overall stiffness of the structure decreased by 87%,and the joint opening,structural deformation and prestressed tendon strain increased significantly.(2)After the side part was completely unloaded,the structure had obvious deformation,but it still had a certain bearing capacity.(3)In the whole process of the experiment,the structural stiffness first decreased,then increased and finally decreased substantially.The final stiffness was only 36%of the initial stiffness.

关 键 词：束合管幕结构 横向预应力 足尺试验 力学性能 

分 类 号：U451.5[建筑科学—桥梁与隧道工程]