类矩形盾构隧道无立柱衬砌结构受力性能足尺试验
郦亮1吴奕环1周俊宏1张友伟1刘震2柳献2
Fullscale Test on Structural Mechanical Performance of Pillarless Lining for Quasirectangular Shield Tunnel
LI LiangWU YihuanZHOU JunhongZHANG YouweiLIU ZhenLIU Xian
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作者信息:1.宁波市轨道交通集团有限公司, 315101, 宁波
2.同济大学土木工程学院, 200092, 上海
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Affiliation:Ningbo Rail Transit Group Co., Ltd., 315101, Ningbo, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.12.011
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中图分类号/CLCN:U451+.4
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栏目/Col:研究报告
摘要:
目的：类矩形无立柱盾构隧道相比于典型双跨类矩形盾构隧道取消了立柱，因此，亟需探明其结构力学性能、设计关键点和受力薄弱点等情况，以保证施工结构的安全性。方法：基于关键截面内力及变形等效方法设计了试验荷载及对应加载制度，模拟了隧道结构在实际运营工况下的结构受荷状态。试验过程中对结构整体及局部的变形、内力等响应进行了监测，重点分析了结构整体变形、接头变形和螺栓轴力发展过程，并提炼出结构运营阶段力学响应的一般性特征。结果及结论：完成了类矩形盾构隧道无立柱衬砌结构的设计并开发了配套的原型结构试验平台；隧道结构的长短轴收敛变形绝对值之比在2.22左右，说明该结构整体性尚有优化空间；隧道结构的薄弱点在顶底靠近跨中位置的1、5号正弯矩接头和靠近左右侧腰部的3、8号负弯矩接头；结构薄弱部位变形和内力随外荷载上升发展均较快，需要在设计优化及施工运维时给予重点关注。
Abstracts:
Objective: In comparison to typical doublespan quasirectangular shield tunnels, the pillarless lining structure for quasirectangular shield tunnels eliminates pillars, making it essential to explore the structural mechanical performance, design key points, and weak parts to ensure the safety of the construction structure.Method: The test loads and corresponding loading systems are designed based on the equivalent method of key section forces and deformations, simulating the structural loading conditions under actual operating conditions of the tunnel. During the test, the overall and local responses, including deformation and internal forces are monitored. The focus is on analyzing the overall deformation, joint deformation, and bolt axial force development process. General characteristics of the mechanical response during the operational phase are extracted.Results and conclusions: The design of pillarless lining structure for quasirectangular shield tunnels is completed, and a corresponding prototype structure test platform is developed. The ratio of absolute values of longaxis and shortaxis convergence deformations of the tunnel structure is around 2.22, indicating potential optimization space for the overall structural integrity. Weak points of the tunnel structure are identified at the 1st and 5th positive moment joints near the midspan position, and 3rd and 8th negative moment joints near the left and right waist parts. Deformations and internal forces in these structurally weak areas develop rapidly with increasing external loads, requiring particular attention in design optimization, construction, operation and maintenance.
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