Chapter
Apr 26, 2012
Reliability-Based Design for Basal Heave in an Excavation Considering Spatial Variability
Authors: Shih-Hsuan Wu, Ph.D. [email protected]., Chang-Yu Ou [email protected]., Jianye Ching [email protected]., and C. Hsein Juang [email protected].Author Affiliations
Publication: GeoFlorida 2010: Advances in Analysis, Modeling & Design
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 non-stationary 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 1.6–2.5, respectively, for the average value of vertical scale of fluctuation of 2.5 m.
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© 2010 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Student, Dept of Construction Engineering, National Taiwan University of Science and Technology, # 43, Sec. 4, Keelung Rd., Taipei, 106, Taiwan, R.O.C. E-mail: [email protected].
Professor, Dept of Construction Engineering, National Taiwan University of Science and Technology, # 43, Sec. 4, Keelung Rd., Taipei, 106, Taiwan, R.O.C. E-mail: [email protected].
Associate Professor, Dept of Civil Engineering, National Taiwan University, #1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan, R.O.C. E-mail: [email protected].
Professor, Dept of Civil Engineering, Clemson University, Clemson, South Carolina, USA. E-mail: [email protected].
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