环形支撑体系在超大异形深基坑中的应用研究

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摘要 研究目的: 随着轨道交通线网的发展,出现很多体量庞大的多线换乘车站,其基坑一般呈超大、异形的特点,如何选择一种安全经济合理的围护形式至关重要。本文以广州天河公园地铁站基坑工程为例,开展超大异形深基坑工程支护设计方案研究,根据工期要求,提出变形控制措施及优化方案。
研究结论: (1)环形支撑与传统对撑方案比较,能显著减少支撑数量,支撑平面布置灵活,经济合理;(2)基坑分区设计可降低支护设计难度,改善围护结构受力,但导致工期增加,在基坑安全及施工进度两方面因素综合评估下,必要的基坑分期选择显得尤为重要,本项目大基坑支护方案相比较原方案总工期节约8个月;(3)环形支撑体系在异形基坑支护中发挥了较大优势,偏压受力工况下亦可满足支护结构受力要求,确保基坑安全;(4)本研究成果可为异形深基坑工程提供一定的理论参考和工程借鉴。

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	吴坤

关键词 ：超大异形深基坑, 基坑分区, 环形支撑, 偏压受力

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

收稿日期: 2022-01-21

PACS:

TU473

作者简介: ^**吴坤,1989年出生,男,工程师。

引用本文:

吴坤. 环形支撑体系在超大异形深基坑中的应用研究[J]. 铁道工程学报, 2022, 39(6): 50-55.
WU Kun. Application of Circular Strut System in Large Special-shaped Deep Foundation Excavations. Journal of Railway Engineering Society, 2022, 39(6): 50-55.

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https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I6/50

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