Hybrid Method for Predicting the Response of a Pile-Raft Foundation to Adjacent Braced Excavation
Publication: International Journal of Geomechanics
Volume 20, Issue 4
Abstract
With the increasing development of underground spaces in cities, a critical indicator for the design of excavation in urban areas is controlling the damage potential of adjacent buildings. Unfortunately, the design of excavations in built-up areas is very challenging because no analysis method has been developed for predicting the influence of excavation on adjacent pile-supported buildings. In this study, the small-strain-based empirical method was adopted for calculating the free-field soil movement induced by braced excavation, and a two-step method was developed to calculate the pile-raft response to braced excavation based on solutions for layered materials. Both the vertical and horizontal responses of the pile-raft foundation are considered. The proposed method was validated through a comparison of its results with those from model tests, the finite-element method, and existing methods in the literature. The proposed method could provide acceptable results of the horizontal and double-directional response of a pile-raft foundation induced by excavation in homogeneous and layered soil. Therefore, it can be used for estimating potential damage from excavation to adjacent buildings.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors gratefully acknowledge financial support by the National Key R&D Program (Grant No. 2016YFC0800200), the National Natural Science Foundation of China (Grand Nos. 51738010 and 41572260), Shanghai Science and Technology Committee Rising-Star Program (19QC1400500), and the Fundamental Research Funds for the Central Universities.
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Published In
International Journal of Geomechanics
Volume 20 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jan 18, 2019
Accepted: Sep 16, 2019
Published online: Feb 4, 2020
Published in print: Apr 1, 2020
Discussion open until: Jul 4, 2020
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