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Practical Guidelines for Assessing Undrained Shear Strength from Triaxial Compression with Isotropic and Anisotropic Consolidation
Selection of shear strength parameters for geotechnical analyses is often informed by laboratory testing of compacted and undisturbed soil samples. Laboratory tests commonly used to characterize peak shear strength include direct shear tests, direct simple shear tests, and triaxial compression tests. Consolidated-undrained triaxial compression tests with pore-pressure measurements are particularly useful and common, because the test results allow for interpretation of both drained and undrained strength parameters. Even though stress conditions in the field are generally anisotropic, samples for consolidated-undrained triaxial compression tests are most often isotropically consolidated. For cases where strength interpretation requires that the in situ stress conditions be considered, empirical and theoretical correlations between undrained shear strength from these differing consolidation-stress conditions are available to understand the potential differences in shear strength parameters. This paper presents an overview of previously proposed empirical and theoretical correlations. The methods are evaluated using a shear strength database of soils for which both isotropically and anisotropically consolidated-undrained triaxial compression tests were performed. Based on a review of the predicted and measured shear strengths, practical recommendations are made for use in engineering practice.
Practical Guidelines for Assessing Undrained Shear Strength from Triaxial Compression with Isotropic and Anisotropic Consolidation
Selection of shear strength parameters for geotechnical analyses is often informed by laboratory testing of compacted and undisturbed soil samples. Laboratory tests commonly used to characterize peak shear strength include direct shear tests, direct simple shear tests, and triaxial compression tests. Consolidated-undrained triaxial compression tests with pore-pressure measurements are particularly useful and common, because the test results allow for interpretation of both drained and undrained strength parameters. Even though stress conditions in the field are generally anisotropic, samples for consolidated-undrained triaxial compression tests are most often isotropically consolidated. For cases where strength interpretation requires that the in situ stress conditions be considered, empirical and theoretical correlations between undrained shear strength from these differing consolidation-stress conditions are available to understand the potential differences in shear strength parameters. This paper presents an overview of previously proposed empirical and theoretical correlations. The methods are evaluated using a shear strength database of soils for which both isotropically and anisotropically consolidated-undrained triaxial compression tests were performed. Based on a review of the predicted and measured shear strengths, practical recommendations are made for use in engineering practice.
Practical Guidelines for Assessing Undrained Shear Strength from Triaxial Compression with Isotropic and Anisotropic Consolidation
Boone, Michael D. (author) / Thompson, Mark J. (author) / VandenBerge, Daniel R. (author)
Geo-Congress 2020 ; 2020 ; Minneapolis, Minnesota
Geo-Congress 2020 ; 398-406
2020-02-21
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2020
Unconsolidated‐Undrained Triaxial Compression
| Wiley | 2009