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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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

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	Articles by authors
	WANG Zhijie1
	ZHOU Feicong1
	ZHOU Ping1
	JIANG Yifan1
	DENG Shumi2
	REN Ren2

Cite this article:

WANG Zhijie1,ZHOU Feicong1,ZHOU Ping1, et al. Research on deformation theory of existing stations based on single side excavation and unloading of large foundation pits with strong close connection[J]. , 2020, 39(10): 2131-2147.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0341 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I10/2131

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