Reliability analysis of strip footing considering spatially variable undrained shear strength that linearly increases with depth

Dian Qing Li*, Xiao Hui Qi, Zi Jun Cao, Xiao Song Tang, Wei Zhou, Kok Kwang Phoon, Chuang Bing Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

This paper aims to investigate the reliability of strip footing in the presence of spatially variable undrained shear strength that linearly increases with depth. A non-stationary random field is used to model the spatially varying undrained shear strength. A strip footing example is presented to investigate the effect of spatially variable undrained shear strength on the performance of strip footing. The results indicate that the mean bearing capacity for spatially variable undrained shear strength is smaller than that obtained from a deterministic analysis. Both the mean and standard deviation of bearing capacity increase with increasing autocorrelation length. Ignoring the trend of undrained shear strength linearly increasing with depth will significantly overestimate the probability of failure of the strip footing. A factor of safety significantly below 3.0 may be used for designing strip footings if the trend of undrained shear strength linearly increasing with depth is considered properly.

Original languageEnglish
Pages (from-to)866-880
Number of pages15
JournalSoils and Foundations
Volume55
Issue number4
Early online date21 Jul 2015
DOIs
Publication statusPublished - 1 Aug 2015
Externally publishedYes

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