Geotechnical Reliability Analysis Involving Spatially Autocorrelated Soil Properties

Conference paper (2015)

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Copyright: © 2015 The Authors and IOS Press, Creative Commons CC-BY
DOI: https://doi.org/10.3233/978-1-61499-580-7-657
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Published Date

14-10-2015

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Abstract

Spatial autocorrelation arises in geological material by virtue of its formation by natural processes acting over long geologic time (millions of years). This endows geomaterial with some unique statistical features (e.g. spatial variability) not commonly found in structural material manufactured under strict quality control. For example, by the nature of the slow precipitation over many years of fine-grained soil particles in water in nearly horizontal layers, two points in close horizontal or vertical proximity to one another are likely to be more positively correlated (likely to have similar undrained shear strength values, for example) than two points further apart in the vertical direction. This paper presents reliability analyses involving spatially autocorrelated undrained shear strength for a laterally loaded pile, an embankment on soft ground, and a clay slope in southern Norway. Information on parametric sensitivity from reliability analysis and insights from reliability analysis will be discussed.