盾构始发后靠剪力墙对反力架力学特性影响研究
魏驰1张亚洲1姚占虎1,2樊振宇3徐云龙1王晟4
Influence of Back-Support Shear Wall for Shield Launching on the Mechanical Characteristics of the Reaction Frame
WEI Chi1ZHANG Yazhou1YAO Zhanhu1,2FAN Zhenyu3XU Yunlong1Wang Sheng4
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作者信息:1.中交隧道工程局有限公司，211100，北京
2.中交一公局集团有限公司，100024，北京
3.上海东杜岩土科技有限公司，201899，上海
4.上海市政工程设计研究总院（集团）有限公司，200092，上海
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Affiliation:1.CCCC Tunnel Engineering Company Limited, 211100, Beijing, China
2.CCCC First Highway Engineering Group Co., Ltd., 100024, Beijing, China
3.Shanghai Doondo Geotechnical Technology Co., Ltd., 201899, Shanghai, China
4.Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., 200092, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.017
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］由于盾构始发场地空间有限，导致反力架尺寸受限，难以单独提供足够的盾构始发反力。因此，需设计并安装反力架后靠结构，以实现两者协同受力。［方法］以上海机场联络线工程为背景，采用有限元分析方法，系统地研究了反力架与剪力墙之间的连接方式，并分析了剪力墙的纵向长度、厚度及高度等参数对反力架结构受力与变形的影响。通过模拟计算，筛选出反力架与剪力墙之间最优的连接方式以及剪力墙的最优尺寸组合。［结果及结论］反力架与剪力墙间采取贴合的连接方式，避免反力架和永久结构贴合面传递弯矩，对永久结构影响更小，并可以有效释放反力架不利部位的弯矩，使反力架受力更加合理。随着剪力墙纵向长度的加长，可显著提高反力架和剪力墙结构受力变形能力；剪力墙厚度的变化对反力架受力变形影响较小，但在一定程度上可以增强剪力墙自身受力、减小变形；剪力墙高度对反力架和剪力墙结构受力及变形的影响非常显著；当剪力墙高度小于13.5m时，由于墙顶未锚入中板，导致反力架和剪力墙自身的受力、变形均处于不利状态。
Abstracts:
［Objective］ Due to the limited space available at the shield launching site, the restricted size of the reaction frame cannot provide sufficient shield launching reaction force on its own. Therefore, it is necessary to design and install a back-support structure for the reaction frame to achieve synergistic stress between the two. ［Method］ Taking a project on Shanghai Airport Link Line as the background, the finite element analysis method is adopted to systematically study the connection method between the reaction frame and the shear wall, and the influence of the shear wall longitudinal length, thickness and height on the stress and deformation of the reaction frame structure is analyzed. Through simulation, the optimal connection method between the reaction frame and the shear wall, as well as the optimal size combination of the shear wall are screened out. ［Result & Conclusion］ The reaction frame and the shear wall are connected in a close-fitting manner to avoid the transmission of bending moment by the fitting surface of the reaction frame and the permanent structure, which has less influence on the permanent structure and can effectively release the bending moment at the unfavourable parts of the reaction frame, making the stress of the reaction frame more reasonable. As the longitudinal length of the shear wall increases, the stress and deformation capacity of the reaction frame and shear wall structure can be significantly improved; the change in the thickness of the shear wall has less influence on the stress and deformation of the reaction frame, but to some extent it can enhance the stress of the shear wall itself and reduce the deformation. The height of the shear wall has a very significant influence on the stress and deformation of the reaction frame and the shear wall structure. When the height of the shear wall is less than 13.5 m, because the top of the wall is not anchored into the center plate, resulting in the unfavorable state for the stress and deformation of the reaction frame and shear wall itself.
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