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Evaluation of excavation-induced movements through case histories in Hangzhou

Hong-Wei Ying (Zhejiang University, Hangzhou, China and Hohai University, Nanjing, China)
Kang Cheng (Zhejiang University, Hangzhou, China)
Li-Sha Zhang (Zhejiang University City College, Hangzhou, China)
Chang-Yu Ou (National Taiwan University of Science and Technology, Taipei, Taiwan)
Yong-Wen Yang (Zhejiang University, Hangzhou, China)

Engineering Computations

ISSN: 0264-4401

Article publication date: 10 February 2020

Issue publication date: 21 May 2020

291

Abstract

Purpose

Deep excavation in soft clay often causes additional deformations to surroundings. Then, if deformations cannot be predicted reasonably, the adjacent buildings may be threatened by the deep excavation. Based on the good field observations from ten deep excavations in Hangzhou, this paper aims to thoroughly investigate the characteristics of wall deflections and ground settlements induced by deep excavations.

Design/methodology/approach

On the basis of good field observation of ten deep excavations, the performances of excavations, supported by contiguous pile in Hangzhou, were studied, and also compared with other case histories.

Findings

The maximum wall deflections (dhm) rang mostly from 0.7 to 1.2 per cent He, where He is the final excavation depth, larger than those in Taipei and Shanghai. The observed maximum ground settlement in the Hangzhou cases generally ranges from 0.2 to 0.8 per cent He. Then, the settlement influence zone extends to a distance of 2.0-4.0 He from the excavation. The relatively large movements and influence zones in Hangzhou may be attributed to low stability numbers, large excavation widths and the creep effect. The excavation width is justified to have a significant influence on the wall deflection. Therefore, to establish a semi-empirical formula for predicting the maximum wall deflection, it is necessary to include the factor of excavation width.

Originality/value

The relevant literature concentrated on the characteristics of deep excavations supported by the contiguous pile wall in Hangzhou soft clay can rarely be found. Based on the ten deep excavations with good field observation in Hangzhou, the characteristics of wall deflection and ground settlements were comprehensively studied for the first time, which can provide some theoretical support for similar projects.

Keywords

Acknowledgements

The authors thank the National Natural Science Foundation of China (grant No. 51678523; 51808492), the Key Research and Development Program of Zhejiang Province (Grant No. 2018C03G2010707) for providing financial support for this research.

Citation

Ying, H.-W., Cheng, K., Zhang, L.-S., Ou, C.-Y. and Yang, Y.-W. (2020), "Evaluation of excavation-induced movements through case histories in Hangzhou", Engineering Computations, Vol. 37 No. 6, pp. 1993-2016. https://doi.org/10.1108/EC-06-2019-0256

Publisher

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Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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