Characterization and Estimation of Geotechnical Variability in Ankara Clay: A Case History |
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Authors: | Sami O Akbas Fred H Kulhawy |
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Institution: | (1) Department of Civil Engineering, Gazi University, Celal Bayar Bulvari, Maltepe, Ankara, 06570, Turkey;(2) School of Civil and Environmental Engineering, Hollister Hall, Cornell University, Ithaca, NY 14853-3501, USA |
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Abstract: | An important component in reliability-based design is the geotechnical property variability. Generic estimates are used often,
but calibration to a local geologic setting is preferable. In this case history, a methodology is shown that employs local
geotechnical data to estimate the total variability, using Ankara Clay for illustration. A literature review is used to estimate
the inherent variability, which is modeled as a random field with coefficient of variation (COV) and scale of fluctuation.
The resulting inherent variability COVs are much smaller than the generic ranges. Local correlations between various laboratory
and field tests and soil strength and compressibility parameters then are developed to quantify the transformation uncertainties.
The various sources of uncertainty are combined through a second-moment method to estimate the total geotechnical variability
as a function of the test type and correlation used. The results show: (1) the COVs for direct laboratory measurements are
significantly smaller than those obtained through correlations, and (2) depending on the geotechnical data available, the
local COVs can be very different from the generic guidelines. These could lead to unconservative designs. These issues are
illustrated by a simple design example. |
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