Abstract
The strength of the soil–structure interface can be mobilised when subjected to cyclic loading. To capture the cyclic mobilisation of the soil–structure interface, an advanced elastoplastic constitutive model is developed within the framework of fractional plasticity, where no additional use of an additional plastic potential is required. Considering the influence of material state and soil fabric on the plastic response of the soil–structure interface, the state-dependent fractional order and hardening modulus are proposed. Further numerical simulation of the developed model shows that it can reasonably capture the mobilised strength and deformation of the soil–structure interface under cyclic loads.
Highlights
Geotechnical engineering usually encounters the interaction between soil and structure [1]
Zhang and Zhang [11] carried out a series of direct interface shear tests on a gravelly soil–steel interface under various loading conditions, e.g., constant normal load (CNL) and constant normal stiffness (CNS) shearing
It was found that the interface thickness increased with the mean particle size of soil; the interface strength mobilised with the cyclic loading path and was influenced by the initial relative density, particle shape, particle size, normal stiffness and effective normal stress
Summary
Geotechnical engineering usually encounters the interaction between soil and structure [1]. Conducted a series of interface shear tests on different sand–geosynthetic interfaces, with the aid of digital particle image velocimetry to track the local particle movement From these studies, it was found that the interface thickness increased with the mean particle size of soil; the interface strength mobilised with the cyclic loading path and was influenced by the initial relative density, particle shape, particle size, normal stiffness and effective normal stress. By extending the original fractional plasticity for granular and soft soils [21,22], Sun et al [18,23] proposed a family of fractional plastic models to capture the load–displacement behaviour of the granular soil–structure interface These models did not consider the effect of soil fabric on the cyclic mobilisation of the interface, as well. When the soil and structure start to separate from each other, the developed interface model is no longer applicable
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