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Laboratory measurement of strength of weak clay samples

Spencer, Christine and Diambra, Andrea 2019. Laboratory measurement of strength of weak clay samples. Presented at: The XVII European Conference on Soil Mechanics and Geotechnical Engineering, Reykjavik, Iceland, 1-6 September 2019.

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The use of Triaxial tests to directly measure the undrained shear strength of very soft clays is impractical due to resulting sample disturbance and provides inadequate resolution. Indirect testing methods including the fall cone, T-bar and cone penetrometer test (CPT) are often preferable. However, analysis of these methods is dependent on empirically derived correlations. Variable bearing capacity factors derived from large scale tests or from in-situ testing introduce uncertainty concerning results of penetrometer tests. A robust, simple and reliable method of determining the undrained shear strength of very soft clays is required. Miniature T-bar and cone penetrometers were developed for this research. Experiments were conducted to measure the resistance to penetration in Speswhite Kaolin and Bentonite clay samples, with strengths ranging from approximately 1kPa to 20kPa. The effects of moisture content and rate of penetration were investigated. Results from penetrometer tests and standard fall cone tests were compared to determine suitable bearing capacity factors, to enable estimation of the strength of samples tested in relation to moisture content.

Item Type: Conference or Workshop Item (Paper)
Status: In Press
Schools: Engineering
Date of First Compliant Deposit: 22 July 2019
Date of Acceptance: 1 February 2019
Last Modified: 02 Sep 2019 10:07

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