Reliability-Based Design for Basal Heave Stability of Deep Excavations in Spatially Varying Soils
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 138, Issue 5
Abstract
Spatial variability of soil undrained shear strength is usually not rigorously considered in the design of basal heave for deep excavations. In this study, the slip circle method is employed to investigate how the required safety-factor against basal heave was affected by spatial variability in the context of reliability-based design. The nonstationary random field model is adopted to model spatial variability of undrained shear strength. Results show that the required safety-factor obtained with the consideration of spatial variability is much smaller than that without the consideration. Parametric studies show that the vertical scale of fluctuation has a significant influence on the required safety-factor: the longer the scale of fluctuation, the larger the required safety-factor. For target failure probabilities of 0.01 and 0.001, the corresponding required safety factors are in the ranges of 1.4–1.9 and 1.6–2.4, respectively, for the average value of vertical scale of fluctuation of 2.5 m. Design charts are provided for the ease of implementation, and an example of reliability-based design for basal stability is given for demonstration.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 138 • Issue 5 • May 2012
Pages: 594 - 603
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Jul 7, 2009
Accepted: Aug 26, 2011
Published online: Aug 30, 2011
Published in print: May 1, 2012
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