类矩形盾构隧道无立柱衬砌结构力学性能模型研究
班勇婷1周俊宏1郦亮1夏汉庸1刘震2柳献2管攀峰3
Analysis and Research on Mechanical Performance Model of Pillarless Lining Structure for Quasirectangular Shield Tunnel
BAN YongtingZHOU JunhongLI LiangXIA HanyongLIU ZhenLIU XianGUAN Panfeng
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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
3.上海市隧道工程轨道交通设计研究院, 200235, 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.2023.12.010
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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结构能适用于隧道渡线段，但缺乏该新型结构的针对性力学性能分析模型，故有必要对此开展研究。方法：基于无立柱盾构隧道原型结构试验结果，初步分析了钢结构管片在设计运营工况下的整体变形及位移特征。进一步采用等效刚度均质环模型和梁弹簧模型对结构的受荷响应进行了模拟，其中梁弹簧模型的计算参数通过接头足尺试验来标定。将2种模型的计算结果与足尺试验结果进行对比，分析了不同模型的优劣，给出了不同模型的适用范围。最后,结合力法原理和2种计算分析模型对类矩形无立柱衬砌结构的变形机理进行了分析，探究钢结构管片不同部分的变形贡献。结果及结论：等效刚度均质环模型及梁弹簧模型均可用于类矩形盾构隧道无立柱衬砌结构的计算分析，其中梁弹簧模型对于钢结构管片力学性能的模拟更加精确，尤其是在变形方面；等效刚度均质环模型对于钢结构管片响应的模拟精度稍差，但是用于结构设计仍然能保证足够的安全储备。针对结构变形机理的分析表明，类矩形无立柱盾构隧道结构的收敛变形主要来源于管片本体及接头两部分，其中接头变形约其占2/3。
Abstracts:
Objective: Pillarless lining structure for shield tunnels is suitable for tunnel crossover sections, but there is a lack of targeted mechanical performance analysis model for this new type of structure, making research in this regard necessary.Method: Based on the prototype structure test results of pillarless shield tunnels, the overall deformation and displacement characteristics of the SSS (steel structural segments) under design operating conditions are preliminarily analyzed. Further, simulation of the load response of the structure is carried out using both the ESHM (equivalent stiffness homogeneous ring model) and the beamspring model, with the calculation parameters of the latter calibrated through fullscale joint tests. The calculation results of the two models are compared with fullscale test results to analyze their advantages and disadvantages, providing insights into the applicable range of different models. Finally, combining the force method principle and the two calculation analysis models, the deformation mechanism of the quasirectangular pillarless lining structure is analyzed, and the contribution of different SSS parts are explored.Result and Conclusion: The research results indicate that both the ESHM and the beamspring model can be used for the calculation and analysis of pillarless lining structure for quasirectangular shield tunnels. The beamspring model provides a more accurate simulation of the SSS mechanical performance, especially in terms of deformation. The ESHM has a slightly lower accuracy in simulating the response of SSS but still ensures an adequate safety margin for the structural design. The analysis of the SSS deformation mechanism suggests that the convergence deformation of the pillarless lining structure for quasirectangular shield tunnels primarily originates from the body and joints of the segment, with joint deformation accounting for approximately twothirds of the total deformation.
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