基于强近接大型基坑单侧开挖卸载既有车站变形理论研究

doi:10.13722/j.cnki.jrme.2020.0341

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摘要为探究综合交叉换乘车站群大型基坑单侧开挖对既有车站变形响应影响特征，结合板壳理论、数值模拟和现场实测，基于锦城广场三车站换乘的强近接单侧基坑卸载引起变形和力学问题展开深入研究，主要得到以下研究成果：(1) 强近接基坑开挖诱发既有车站结构向卸载一侧整体倾倒，其结构侧向变形随开挖深度增大呈指数增长，随开挖长度呈抛物线增长；(2) 车站结构整体变形随附加荷载增大呈线性增大，且结构顶部变形受附加荷载影响较最大变形位置的敏感；(3) 既有车站结构变形随土体重度增大呈线性增大，而随车站刚度降低呈指数增大；(4) 基于Pearson相关性分析，开挖深度变化显著影响车站的侧向结构变形，其次为开挖长度，然后是附加荷载和既有车站刚度，土体重度的影响最不显著；(5) 基于统计分析，位移最值点高度存在上下限，强近接单侧基坑开挖影响最危险区域为0.59H～0.73H位置，实际施工中宜重视该高度范围内围护结构的安全稳定性。

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	王志杰1
	周飞聪1
	周平1
	姜逸帆1
	邓树密2
	任

关键词 ：基坑工程, 大型深基坑, 交叉换乘中心, 强近接施工, 变形理论, 力学模型

Abstract：In order to explore the deformation response characteristics of large foundation pit excavation on one side of the comprehensive cross exchange station group，the deformation and mechanical problems caused by the unloading of one side foundation pit with strong proximity to the transfer of three stations in Jincheng square are studied based on the theory of plate and shell，numerical simulation and field measurement. The research results show that the excavation of the strong adjacent foundation pit induces the existing station structure to dump to the unloading side as a whole, and that the lateral deformation of the structure increases exponentially with increasing the excavation depth and parabolically with rising the excavation length. The overall deformation of the station structure increases linearly with increasing the additional load，and the deformation of the top of the structure is more sensitive to the additional load than the maximum deformation position. The deformation of the existing station structure increases linearly with increasing the soil mass density and exponentially with decreasing the station stiffness. Based on Pearson correlation analysis，the excavation depth has a significant impact on the lateral structural deformation of the station，followed by the excavation length， the additional load and the stiffness of the existing station，and the influence of the soil weight is the least significant. Based on the statistical analysis，there are upper and lower limits for the height of the displacement maximum point，and the most dangerous area affected by the excavation of single side foundation pit is 0.59H–0.73H. In the actual construction，attention should be paid to the safety and stability of the retaining structure within the height range.

Key words： foundation pit engineering large deep foundation pit cross transfer center strong close connection construction deformation theory mechanical model

引用本文:

王志杰1，周飞聪1，周平1，姜逸帆1，邓树密2，任. 基于强近接大型基坑单侧开挖卸载既有车站变形理论研究[J]. 岩石力学与工程学报, 2020, 39(10): 2131-2147.
WANG Zhijie1，ZHOU Feicong1，ZHOU Ping1，JIANG Yifan1，DENG Shumi2，REN Ren2. Research on deformation theory of existing stations based on single side excavation and unloading of large foundation pits with strong close connection. , 2020, 39(10): 2131-2147.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0341 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I10/2131

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