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Volume 15
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10.3390/buildings15030463
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Article

Numerical Simulation on an Ultra-Large Seven-Ring Internal Support System Considering the Effects of Soil–Structure Interaction and Temperature

by
Hexiang Hu
1,2,
Yu Tian
1,*,
Neimeng Zheng
1,
Xiuli Du
1,
Haishan Guo
2 and
Zhonghua Xu
3
1
Institute of Geotechnical and Underground Engineering, Beijing University of Technology, Beijing 100124, China
2
China Construction First Group Corporation Limited, Beijing 100161, China
3
Shanghai Underground Space Engineering Design & Research Institute, East China Architecture Design & Research Institute Co., Ltd., Shanghai 200002, China
*
Author to whom correspondence should be addressed.
Buildings 2025, 15(3), 463; https://doi.org/10.3390/buildings15030463
Submission received: 29 December 2024 / Revised: 22 January 2025 / Accepted: 26 January 2025 / Published: 2 February 2025
(This article belongs to the Special Issue Advances in Soil-Structure Interaction for Building Structures)
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Abstract

The foundation pit area of Kunming International Comprehensive Transportation Hub is 56,800 m2, and the excavation depth ranges from 18 m to 25 m. Because the surrounding environment is very complex, the foundation pit is supported by an underground continuous wall and three layers of internal support system with seven rings. The force of this internal support system is coupled integrally, and the number of rings is the highest in the world at present. In this work, a finite element model considering the interaction between soil and the retaining structure is established. The Hardening Soil model with small strain stiffness is used to simulate and analyze the whole excavation process of the foundation pit. Considering the ultra-large plane size of the foundation pit, we cannot ignore the temperature effect, so the deformation of the underground continuous wall and the force of the internal support system under seasonal temperature variation are investigated. By comparing numerical simulation results with field measurements, the deformation of the ultra-large seven-ring internal support system, the deformation of the surrounding soil, and the axial force of the supports are analyzed. The results show that the finite element simulation agrees well with the measured data. This work provides a reliable method for analyzing ultra-large deep foundation pits.
Keywords: ultra-large deep foundation pit; soil–structure interaction; temperature effect; finite element simulation; small strain behavior ultra-large deep foundation pit; soil–structure interaction; temperature effect; finite element simulation; small strain behavior

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MDPI and ACS Style

Hu, H.; Tian, Y.; Zheng, N.; Du, X.; Guo, H.; Xu, Z. Numerical Simulation on an Ultra-Large Seven-Ring Internal Support System Considering the Effects of Soil–Structure Interaction and Temperature. Buildings 2025, 15, 463. https://doi.org/10.3390/buildings15030463

AMA Style

Hu H, Tian Y, Zheng N, Du X, Guo H, Xu Z. Numerical Simulation on an Ultra-Large Seven-Ring Internal Support System Considering the Effects of Soil–Structure Interaction and Temperature. Buildings. 2025; 15(3):463. https://doi.org/10.3390/buildings15030463

Chicago/Turabian Style

Hu, Hexiang, Yu Tian, Neimeng Zheng, Xiuli Du, Haishan Guo, and Zhonghua Xu. 2025. "Numerical Simulation on an Ultra-Large Seven-Ring Internal Support System Considering the Effects of Soil–Structure Interaction and Temperature" Buildings 15, no. 3: 463. https://doi.org/10.3390/buildings15030463

APA Style

Hu, H., Tian, Y., Zheng, N., Du, X., Guo, H., & Xu, Z. (2025). Numerical Simulation on an Ultra-Large Seven-Ring Internal Support System Considering the Effects of Soil–Structure Interaction and Temperature. Buildings, 15(3), 463. https://doi.org/10.3390/buildings15030463

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