Reliability-based design for basal heave in an excavation considering spatial variability

Shih Hsuan Wu, Chang Yu Ou, Jianye Ching, C. Hsein Juang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Scopus citations


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.

Original languageEnglish
Title of host publicationGeoFlorida 2010
Subtitle of host publicationAdvances in Analysis, Modeling and Design - Proceedings of the GeoFlorida 2010 Conference
Number of pages10
StatePublished - 2010
EventGeoFlorida 2010: Advances in Analysis, Modeling and Design Conference - West Palm Beach, FL, United States
Duration: 20 Feb 201024 Feb 2010

Publication series

NameGeotechnical Special Publication
ISSN (Print)0895-0563


ConferenceGeoFlorida 2010: Advances in Analysis, Modeling and Design Conference
Country/TerritoryUnited States
CityWest Palm Beach, FL


  • basal heave
  • reliability-based design
  • spatial variability


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