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Observed Performance of a Large-Scale Deep Triangular Excavation in Shanghai Soft Clays

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Abstract

An 18.4-m-deep triangular foundation pit with in-plane excavation area of approximately 10,000 m2 was constructed in soft clay. The excavation located at Hongqiao comprehensive transportation hub center in Shanghai, in which an energy gallery, many underground pipelines, and viaduct piers exist. Deformation characteristics of the foundation pit and the impact on the adjacent buildings and structures were observed by a monitoring system during excavation. Field data including wall deflections, vertical wall movements, ground subsidence, as well as vertical column movements were analyzed and compared with other excavations of metro stations or rectangular excavations in Shanghai. This excavation exhibited different deformation characteristics from other excavations because of its triangular shape with acute corners. The deformation law of this special excavation was beneficial for the design and construction of special-shaped foundation pit in complex environment.

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Acknowledgements

The authors are grateful for the support provided by the Youth Science Foundation of Jiangxi Provincial Science and Technology Department (Grant 20161BAB216107) for this research work. The anonymous reviewers’ comments have improved the quality of this paper and are also greatly acknowledged.

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Authors and Affiliations

  1. School of Civil Engineering and Architecture, Nanchang University, Nanchang, 330031, China

    Ying Liu & Mingfu Fu

  2. Jiangxi Provincial Engineering Research Center of the Special Reinforcement and Safety Monitoring Technology in Hydraulic and Civil Engineering, Nanchang Institute of Technology, Nanchang, 330099, China

    Ying Liu & Binhui Xiang

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  1. Ying Liu
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  2. Binhui Xiang
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  3. Mingfu Fu
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Correspondence to Ying Liu.

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Liu, Y., Xiang, B. & Fu, M. Observed Performance of a Large-Scale Deep Triangular Excavation in Shanghai Soft Clays. Geotech Geol Eng 37, 2791–2809 (2019). https://doi.org/10.1007/s10706-018-00795-9

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