Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Determination of Initial-Shear-Stress Impact on Ramsar-Sand Liquefaction Susceptibility through Monotonic Triaxial Testing

Version 1 : Received: 3 September 2020 / Approved: 5 September 2020 / Online: 5 September 2020 (05:01:41 CEST)

How to cite: Nategh, M.; Ekinci, A.; Iravanian, A.; Salamatpoor, S. Determination of Initial-Shear-Stress Impact on Ramsar-Sand Liquefaction Susceptibility through Monotonic Triaxial Testing. Preprints 2020, 2020090118 (doi: 10.20944/preprints202009.0118.v1). Nategh, M.; Ekinci, A.; Iravanian, A.; Salamatpoor, S. Determination of Initial-Shear-Stress Impact on Ramsar-Sand Liquefaction Susceptibility through Monotonic Triaxial Testing. Preprints 2020, 2020090118 (doi: 10.20944/preprints202009.0118.v1).

Abstract

Liquefaction risk assessment is critical for the safety and economics of structures. As the soil strata of Ramsar area in north Iran is mostly composed of poorly graded clean sand and the ground water table is found at shallow depths, it is highly susceptible to liquefaction. In this study, a series of isotropic and anisotropic consolidated undrained triaxial tests are performed on reconstituted specimens of Ramsar sand to identify the liquefaction potential of the area. The specimens are consolidated isotropically to simulate the level ground condition, and anisotropically to simulate the soil condition on a slope and/ or under a structure. The various states of soil behavior are studied by preparing specimens at different initial relative densities and applying different levels of effective stress. The critical state soil mechanics approach for identifying the liquefaction susceptibility is adopted and the observed phenomena are further explained in relation to the micro-mechanical behavior. As only four among the 27 conducted tests did not exhibit liquefactive behavior, Ramsar sand can be qualified as strongly susceptible to liquefaction. Furthermore, it is observed that the pore pressure ratio is a good indication of the liquefaction susceptibility

Subject Areas

Anisotropic Triaxial test; Initial shear stress; Pore water pressure ratio; Static liquefaction; Ramsar sand

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