大断面矩形换乘通道密贴下穿对既有地铁车站的力学响应分析
吴俊1,2,3张加兵4孙厚强2,3杜禹2,3滕立荣2,3
Mechanical Response Analysis of Existing Metro Stations Caused by Large-section Rectangular Interchange Passage Closely Underpassing
WU Jun1,2,3ZHANG Jiabing4SUN Houqiang2,3DU Yu2,3TENG Lirong2,3
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作者信息:1.中国建筑集团有限公司， 100089， 北京
2.中建三局基础设施建设投资有限公司， 430073， 武汉
3.中国建筑第三工程局有限公司， 430064， 武汉
4.广西大学土木建筑工程学院， 530004， 南宁
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Affiliation:1.China State Construction Engineering Co., Ltd, 100089, Beijing, China
2.Infrastructure Construction Investment Co., Ltd., China Construction Third Engineering Bureau Co., Ltd., 430073, Wuhan, China
3.China Construction Third Engineering Bureau Co., Ltd., 430064, Wuhan, China
4.College of Civil Engineering and Architecture, Guangxi University, 530004, Nanning, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20245730
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中图分类号/CLCN:U455.43;U231.3
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栏目/Col:土建工程
摘要:
［目的］新建车站大断面矩形换乘通道密贴下穿既有城市轨道交通车站（以下简称“既有车站”）施工造成的扰动非常大，此类研究的文献较少，需要深入研究新建车站密贴下穿时对既有车站的变形及扰动情况。［方法］在阐述传统随机介质理论及算法的基础上，提出了改进算法。以成都轨道交通金府换乘站为例，选取了相关工程计算参数，建立了该换乘站的三维数值仿真模型。分析了成都轨道交通27号线新建金府站换乘通道密贴下穿既有成都轨道交通6号线车站的力学响应。对实测值及仿真值进行对比，以验证改进算法及仿真模型的准确性，并进行了参数的敏感性分析。［结果及结论］通过对比实测值和仿真值，验证了所提改进算法及仿真模型的可行性。受支护桩的约束，既有车站的结构底板出现了弯矩“凹槽”现象。随着新建换乘通道与既有车站间净距的增加，结构底板最不利部位会向隧道中心线外侧偏移。随着地基反力系数的增大，土体和既有车站相互作用增强，既有车站结构底板的变形、弯矩和剪力均显著增大。
Abstracts:
［Objective］ The construction disturbance caused by newly built stations with large-section rectangular interchange passage closely under-passing existing urban rail transit stations (hereinafter referred to as ′existing stations′) is significant, and there is a lack of relevant research on this topic. It is necessary to investigate the deformation and disturbance situation on the existing station caused by the newly built station closely under-passing. ［Method］ Based on the theory of conventional random media and its algorithm, an improved algorithm is proposed. Taking Jinfu Interchange Station of Chengdu Rail Transit as an example, relevant engineering calculation parameters are selected, and a three-dimensional numerical simulation model for the interchange station is established. The mechanical response of Chengdu Rail Transit Line 27 newly built Jinfu Station interchange passage closely under-passing existing Line 6 station is analyzed. The precision of improved algorithm and simulation model is verified through measured and simulated value comparison, and a sensitivity analysis of parameters is carried out. ［Result & Conclusion］ Through comparing measured and simulated values, the feasibility of the improved algorithm and simulation model mentioned above is verified. Constrained by the supporting piles, a bending moment or ′groove′ phenomenon appears on the structural base plate at the existing station. Additionally, with the increase of net spacing between the new interchange passage and the existing station, the most unfavorable part on the structural base plate shifts outward from the tunnel centerline. As the foundation reaction coefficient increases, the interaction between soil and the existing station intensifies, resulting in significant deformation, bending moment, and shear force on the structural base plate of existing station.
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