基于既有盾构隧道区间暗挖施工的城市轨道交通车站结构力学行为研究
张中安1潘野2郭振坤3张姣龙3高一民3柳献3
Mechanical Behavior of Urban Rail Transit Station Structure Based on Existing Shield Tunnel Interval Underground Excavation Construction
ZHANG Zhongan1PAN Ye2GUO Zhenkun3ZHANG Jiaolong3GAO Yimin3LIU Xian3
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作者信息:1.深圳地铁建设集团有限公司，518026，深圳
2.中国铁路设计集团有限公司，300142，天津
3.同济大学土木工程学院，200092，上海
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Affiliation:1.Shenzhen Metro Construction Group Co., Ltd., 518026, Shenzhen, China
2.China Railway Design Corporation, 300142, Tianjin, China
3.College of Civil Engineering, Tongji University, 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.2024.08.023
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中图分类号/CLCN:U455.43；U231.4
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栏目/Col:研究报告
摘要:
［目的］深圳轨道交通14号线肿瘤医院站采用大直径(8.5m)盾构隧道扩挖的“先隧后站”方案，在暗挖车站主体结构与附属出入口连接时，需对隧道衬砌实施局部大尺寸开口施工。为保证隧道开口施工过程中的结构安全性，需对基于既有盾构隧道区间暗挖的城市轨道交通车站结构力学行为进行研究。［方法］采用考虑衬砌结构环、纵缝影响的多环壳-刚性梁-接触衬砌计算模型，对车站暗挖过程进行分工况模拟，设置全开口衬砌环控制工况为开口工况，半开口衬砌环控制工况为拆撑工况；探究封顶块位置、内部支撑形式及隧道纵向开口尺寸等关键设计参数对车站结构的影响。［结果及结论］根据环梁受力特征，建议上、下部环梁在设计时选用钢材或内置钢构件。根据管片受力特性，确定开口区域内通缝拼装管片的排版形式；肿瘤医院站隧道开口区段通缝拼装管片封顶块建议设计在隧道顶部。开口衬砌环管片在施工全程中的弯矩分布与内部支撑有效约束点密切相关，而内部支撑形成有效约束的前提是拥有完整的轴向传力路径。隧道局部开口时开口衬砌环结构的整体性依赖于环缝侧部约束。
Abstracts:
［Objective］ Cancer Hospital Station on Shenzhen Rail Transit Line 14 adopts a scheme of large-diameter (8.5 m) shield tunnel expansion featuring tunnel-first and station-later. During the connection of the main station structure and auxiliary entrances in underground excavation, the construction of large local openings in tunnel lining is required. To ensure the structural safety during tunnel opening construction, it is necessary to study the mechanical behavior of urban rail transit station structure based on existing shield tunnel interval underground excavation.［Method］ To simulate the station underground excavation process under various working conditions, a multi-ring shell-rigid beam-contact lining calculation model considering the effects of lining structure circumferential and longitudinal joints is adopted. The scenarios include full-opening lining ring control condition (opening condition) and half-opening lining ring control condition (support removal condition). Key design parameters, such as the position of capping block, the forms of internal support, and the dimension of tunnel longitudinal opening, are analyzed for their impact on station structure.［Result & Conclusion］ Based on the stress characteristics of ring beams, it is recommended to use steel or embedded steel components for the upper and lower ring beams in the design. It is recommended that the arrangement of through-joint assembled segments in the opening area should be adopted according to segment stress characteristics, and the capping block of tunnel opening section through-joint assembled segments be designed at the tunnel top for Cancer Hospital Station. The bending moment distribution of opening lining ring segments throughout construction process is closely related to the effective constraint points of internal supports, and the premise of internal supports forming effective constraint is a complete axial force transmission path. The integrity of opening lining ring structure is contingent upon the lateral constraints of circumferential joints during the local tunnel opening construction.
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