Framework for tracking the accumulation of shear strains during cyclic mobility

Abstract

Framework for tracking the accumulation of shear strains in experiments exhibiting cyclic mobility behavior of liquefiable sands is implemented in order to evaluate its applicability. Shear strains are decoupled in two components: γ 0 , developed at near-zero effective stress, and γ d , developed while the soil dilates. Results show that the development of γ d is triggered after the specimen exhibits dilative behavior, and increases up to a saturation value after liquefaction triggering. Conversely, γ 0 initiates at liquefaction triggering and its evolution per loading cycle follows an almost linear trend. These results suggest that the linear increase of post-liquefaction shear strains is related to the strains developed at near-zero effective stress, which are closely linked to the evolution of fabric at the particle scale. Further experimental work and DEM simulations are proposed to study the behavior under large deformations, and to understand the mechanism controlling strain accumulation during cyclic mobility.

Publication
In Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, (ICEGE 2019), June 17-20, 2019, Rome, Italy pp.2906-2914