轨道交通桥梁近距施工墙井复合结构影响分析
陈伟1倪蕾1周吟2邓成龙2狄宏规3曹占林3姚琦钰4
Impact Analysis of Wall-Caisson Composite Structure Construction Adjacent to Rail Transit Bridge
CHEN Wei1NI Lei1ZHOU Yin2DENG Chenglong2DI Honggui3CAO Zhanlin3YAO Qiyu4
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作者信息:1.南京上铁地方铁路开发有限公司， 210003， 南京
2.中铁二十四局集团有限公司， 200070， 上海
3.同济大学道路与交通工程教育部重点实验室， 201804， 上海
4.麦克马斯特大学, L8S4L7, 安大略省
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Affiliation:1.Nanjing Shanghai Railway Local Railway Development Co., Ltd., 210003, Nanjing, China
2.China Railway 24th Bureau Group Co., Ltd., 200070, Shanghai, China
3.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, 201804, Shanghai, China
4.McMaster University, L8S4L7, Ontario, Canada
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.05.015
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中图分类号/CLCN:TU753； U443.13+1
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栏目/Col:土建工程
摘要:
［目的］运营铁路的邻近施工变形控制是当前轨道交通规划与建设的重中之重。因此，有必要研究地连墙-沉井复合结构(以下简称“墙-井复合结构”)参数对沉井内部开挖引起的结构受力变形特征及周边土体位移变化规律。［方法］以南通市沪苏通轨道交通桥梁近距施工墙-井复合结构工程为例，采用有限元软件对墙-井复合结构的内力、变形及周边地面沉降规律进行分析。［结果及结论］①沉井在圆形地连墙保护下的水平变形较小，增加沉井和地连墙的厚度会减小墙-井复合结构自身的最大变形和受力；在夹芯土宽度为3~5 m范围内，夹芯土宽度的增大会导致地连墙受力和变形均有所增大，特别是在夹芯土宽度为5 m处会出现骤增点。②封底混凝土及夹芯土的隆起量受墙-井复合结构的厚度影响较小，但在夹芯土宽度为3~5 m范围内，土体隆起量先增大后减小，转折点在夹芯土宽度为4.5 m处。③沉井和地连墙厚度的增大会使周围地面沉降边界减小，尤其是沉井厚度的减弱效应较为显著；夹芯土宽度对地面沉降的影响较大，夹芯土宽度大于3.5 m时的地面沉降开始显著增大。④合理设计墙-井复合结构可以提高沉井的稳定性，减少沉井施工对周围环境的变形影响。
Abstracts:
［Objective］The construction deformation control adjacent to operational railways is of utmost importance in current rail transit planning and construction. Therefore, it is necessary to study the effect of the diaphragm wall-caisson composite structure （hereinafter referred to as WCCS）parameters on the structural stress deformation characteristics, which are caused by the caisson interior excavation and the change patterns of the surrounding soil displacement.［Method］In the case study of a composite structure construction project adjacent to Shanghai-Suzhou-Nantong Railway Bridge in Nantong City, the finite-element software is used to analyze the internal forces, deformations, and the surrounding ground settlement patterns of the WCCS.［Result & Conclusion］Firstly, the caisson under the protection of a circular diaphragm wall exhibits relatively small horizontal deformation. Increasing the thickness of both the caisson and diaphragm wall will reduce the maximum deformation and stress in the WCCS itself. Howe-ver, within the 3~5 m width range of sandwiched soil, the widening of sandwiched soil leads to increased stress and deformation in the diaphragm wall, with a sudden spike particularly observed at the 5 m width of sandwiched soil. Secondly, the uplift value of the bottom-sealed concrete and sandwiched soil is less affected by the thickness of the WCCS. However, within the 3~5 m width range of sandwiched soil, the soil uplift value first increases and then decreases, with the turning point occurring at the 4.5 m width of sandwiched soil. Thirdly, increasing the thickness of the caisson and diaphragm wall reduces the boundary of surrounding ground settlement, with particularly significant weakening effect of the caisson thickness. The width of sandwiched soil has a significant impact on ground settlement, which begins to increase markedly when the width exceeds 3.5 m. Lastly, a well-designed WCCS can improve the stability of the caisson and reduce the deformation impact of caisson construction on the surrounding environment.
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