环形支撑体系在超大异形深基坑中的应用研究

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Abstract Research purposes: With the development of the rail transit network, many large-scale multi-line transfer stations have appeared, and their foundation excavations are generally super-large and irregular. How to choose a safe economical and reasonable retaining structure is essential. Based on foundation excavation of Tianhe Park Station of Guangzhou, the paper carried out the research on the bracing design of the super-large special-shaped deep foundation excavation. According to the requirements of the construction period, deformation control measures and optimization schemes were proposed.
Research conclusions: (1) Compared with the traditional strut system, the circular strut can significantly reduce the number of struts, and the strut plan is flexible and economical. (2) The partitioning implementation design of the foundation excavations can reduce the difficulty of supporting design and improve the force of the retaining structure, but it leads to an increase in the construction period. Under the comprehensive assessment of the two factors of the foundation excavation safety and the construction schedule, that reasonable partitioning implementation of the foundation excavation is essential. Compared with the original retaining and protection structure, the total construction period of the large foundation excavation of this project can be saved by 8 months. (3) The circular strut system has a great advantage in supporting special-shaped foundation excavation, and it can also meet the stress requirements of supporting structure under the condition of non-uniform compression to ensure the safety of foundation pit. (4) The research results can provide some theoretical reference and engineering reference for special-shaped deep foundation excavations.

Key words： large special-shaped deep foundation excavations partitioning of foundation circular strut system non-uniform compression

Received: 21 January 2022

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TU473

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Cite this article:

WU Kun. Application of Circular Strut System in Large Special-shaped Deep Foundation Excavations[J]. Journal of Railway Engineering Society, 2022, 39(6): 50-55.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I6/50

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