Comparison of geotechnical uncertainties linked to different soil characterization methods |
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Authors: | Mwajuma Ibrahim Lingwanda Anders Prästings Stefan Larsson Dalmas L. Nyaoro |
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Affiliation: | 1. Department of Transportation and Geotechnical Engineering, University of Dar es Salaam, Dar es Salaam, Tanzaniamwajuma.lingwanda@byv.kth.se;3. Department of Civil and Architectural Engineering, KTH Royal Institute of Technology, Stockholm, Sweden;4. Department of Transportation and Geotechnical Engineering, University of Dar es Salaam, Dar es Salaam, Tanzania |
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Abstract: | One of the essential inputs in settlement prediction models is the soil modulus, which may be obtained from laboratory tests or estimated from in situ measurements. The total uncertainty in predicting the confined modulus of a sandy soil is quantified with data from side-by-side in situ testing using the standard penetration test, the static cone penetration test, the light dynamic probing and the laboratory oedometer test. To estimate transformation errors, correlations are proposed between in situ and laboratory data. The results indicate that similar magnitudes of total uncertainties are associated with the in situ methods, which are approximately twice as high as those from the direct oedometer method. The quantified uncertainties are an important input for reliability-based designs of foundations under similar soil conditions. |
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Keywords: | Settlement prediction geotechnical uncertainty in situ tests comparison oedometer test soil modulus reliability-based design |
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