Study on Spatiotemporal Evolution Laws and Deformation Characteristics of Circular Deep and Large Foundation Pits in Soft Soils

IF 2.6 4区综合性期刊 Q2 MULTIDISCIPLINARY SCIENCES

Arabian Journal for Science and Engineering Pub Date : 2024-03-18 DOI:10.1007/s13369-023-08675-y

Hanzhi Liu, Xinrong Liu, Xiaohan Zhou, Linfeng Wang, Kexiao Wang, Jilu Zhang, Xueyan Guo

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Abstract

With the increasing demand for large and deep anchor projects in soft soil areas, issues related to settlement in circular foundation pits and damage to supporting structures have become significantly pronounced. The absence of pertinent design methods significantly impacts construction safety. Through on-site monitoring and statistical analysis, this study examines the spatiotemporal evolution of deformation in circular foundation pits, the deformation characteristics of retaining structures, and surface settlement features. Key design factors influencing the stability of circular foundation pits are explored. The research indicates that structural deformation and surface settlement are closely related over time and exhibit substantial spatial coordination. The deformation control capability of circular foundation pits is considerably stronger than that of square foundation pits, and it is less influenced by excavation depth. Diameter and soft soil thickness have a substantial impact on structural deformation and surface settlement. When the diameter is less than 40 m, the structural deformation remains below 0.1%. The study establishes an evaluation method for the deformation control of large and deep circular foundation pits in soft soil based on a significant amount of engineering monitoring data. It categorizes deformation control indicators for pit excavation based on different design factors, offering reliable theoretical support for relevant design professionals.

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软土中圆形深大基坑的时空演变规律和变形特征研究

随着软土地区大型深层锚固工程的需求不断增加，与圆形基坑沉降和支护结构损坏相关的问题也变得日益突出。相关设计方法的缺乏严重影响了施工安全。本研究通过现场监测和统计分析，研究了圆形基坑变形的时空演变、支护结构的变形特征以及地表沉降特征。研究还探讨了影响圆形基坑稳定性的关键设计因素。研究表明，结构变形和地表沉降在时间上密切相关，在空间上也有很大的协调性。圆形基坑的变形控制能力明显强于方形基坑，且受开挖深度的影响较小。直径和软土厚度对结构变形和地表沉降有很大影响。当直径小于 40 米时，结构变形保持在 0.1% 以下。该研究基于大量工程监测数据，建立了软土中大型深基坑圆形基坑变形控制的评价方法。它根据不同的设计因素对基坑开挖的变形控制指标进行了分类，为相关设计人员提供了可靠的理论支持。

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来源期刊

Arabian Journal for Science and Engineering MULTIDISCIPLINARY SCIENCES-

CiteScore

5.70

自引率

3.40%

发文量

993

期刊介绍： King Fahd University of Petroleum & Minerals (KFUPM) partnered with Springer to publish the Arabian Journal for Science and Engineering (AJSE). AJSE, which has been published by KFUPM since 1975, is a recognized national, regional and international journal that provides a great opportunity for the dissemination of research advances from the Kingdom of Saudi Arabia, MENA and the world.