Cyclic liquefaction screening of sand with non-plastic fines: critical state approach
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2020
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Rahman, M.
Sitharam, T.G.
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Geoscience Frontiers, 2020; 11(2):429-438
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There have been significant advances in the application of critical state, CS in liquefaction potential assessment. This was done by comparing state parameter, ψ with estimated characteristic cyclic stress ratio, CSR due to an earthquake. A cyclic resistance ratio, CRR curve, which can be determined from cyclic liquefaction tests, separates historical liquefied and non-liquefied data points (ψ, CSR). On the other hand, the concepts of equivalent granular state parameter, ψ*, which was developed for sands with fines, can be used in lieu ψ to provide a unifying framework for characterizing the undrained response of sands with non/low plasticity fines, irrespective of fines content fc. The present work combines these two propositions, and by merely substituting ψ* for ψ into the aforementioned CS approach to capture the influence of fc. A series of static and cyclic triaxial tests were conducted, separately and independently of the concept of ψ*, for sand with up to fc of 30%. The clean sand was collected from Sabarmati river belt at Ahmedabad city in India which was severely affected during the Bhuj earthquake, 2001. The experimental data gave a single relation for CRR and ψ* which was then used to assess liquefaction potential for a SPT based case study, where fc varies along the depth. The prediction matched with the filed observation.
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Copyright 2018 (https://creativecommons.org/licenses/by-nc-nd/4.0/)
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