Rahman, MM and Sitharam, TG (2020) Cyclic liquefaction screening of sand with non-plastic fines: Critical state approach. In: Geoscience Frontiers, 11 (2). pp. 429-438.
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Abstract
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 field observation.
| Item Type: | Journal Article |
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| Publication: | Geoscience Frontiers |
| Publisher: | Elsevier B.V. |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | constitutive equation; cyclic loading; dynamic response; earthquake engineering; fines; liquefaction; numerical model; sand; soil mechanics |
| Department/Centre: | Division of Mechanical Sciences > Civil Engineering |
| Date Deposited: | 24 Jan 2023 11:15 |
| Last Modified: | 24 Jan 2023 11:15 |
| URI: | https://eprints.iisc.ac.in/id/eprint/79429 |
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