Method for Estimating Fully Coupled Response of Deep Excavations in Soft Clays
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 149, Issue 5
Abstract
The influence of excavation rate, geometric layout, and hydraulic conductivity of basal and retained soils on the fully coupled solid–fluid behavior of braced excavations in cohesive soils is presented. Fully coupled excavation analyses were performed using the hypoplasticity clay model to reproduce the constitutive soil behavior combined with Biot’s consolidation theory. A method aimed at predicting excavation-induced ground movements using excess pore-water pressure ratios as a function of site-specific groundwater considerations is presented for the determination of the recommended type of excavation analysis (i.e., drained, partially drained, or undrained). Results obtained from the numerical simulations indicated that excavation rate to hydraulic conductivity ratios, , smaller than 0.1 and larger than 10,000 can be analyzed under drained and undrained conditions, respectively. The proposed method was validated with published case histories, and its ability to estimate excavation performance in terms of excess pore-water pressures and excavation rates is presented in this paper.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
Financial support for this work was provided by the National Science Foundation (US) Grant No. CMMI-1538506. The support of National Science Foundation is greatly appreciated.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 149 • Issue 5 • May 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jul 20, 2020
Accepted: Nov 29, 2022
Published online: Mar 2, 2023
Published in print: May 1, 2023
Discussion open until: Aug 2, 2023
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