Predicting Excavation-Induced Settlement for Embedded Footing: Case Study
Publication: International Journal of Geomechanics
Volume 18, Issue 4
Abstract
Analytical solutions are proposed to evaluate the average settlement under an embedded footing in an elastic soil. The rigid foundation was simplified as a uniformly loaded area. Four factors, the Gibson, trench, sidewall friction, and retaining wall effects, were considered to reduce the settlement of the footing due to embedment. Immediate settlement of a footing can be calculated using either conventional influence factors or by a finite-layer-based consolidation analysis with a short time interval. The effectiveness of the proposed techniques was evaluated by comparing results obtained from different approaches, and a maximum difference of 10% was observed. The method was also used to analyze the settlements of the base slab of an excavation, which were compared with field measurements of the West Extension Line of the Nanjing Metro Line 10. On the basis of the analysis, the reason why a compensated foundation could experience excessive settlement is discussed. Overexcavation induced by basal heave results in a very loose state of the soil underneath the footing where swelling could occur. Reloading after backfilling easily causes large settlements. Therefore, an arched beam foundation is proposed to reduce the magnitude of further settlement of the footing.
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Acknowledgments
This work was supported by the National Science Fund for Excellent Young Scholars (Grant 51322807), National Natural Science Foundation of China (Grant 51578164), Natural Science Foundation of Guangxi Province (Grant 2016GXNSFGA380008), Ministry of Education of China through the Changjiang Scholars Program to Dr. Guoxiong Mei, and National Natural Science Foundation of China (Grant 41672296) to Dr. Yanlin Zhao.
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Published In
International Journal of Geomechanics
Volume 18 • Issue 4 • April 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Mar 1, 2017
Accepted: Oct 10, 2017
Published online: Jan 22, 2018
Published in print: Apr 1, 2018
Discussion open until: Jun 22, 2018
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