Reformulated fractional plasticity for soil-structure interface

摘要

Correct representation of the non-associated state-dependent behavior of the soil-structure interface is important for geotechnical applications. The original fractional plasticity is reformulated in this study, by exploring the stress-displacement relation of the soil-structure interface under plain strain condition. Without using additional plastic potentials, a state-dependent non-associated plastic flow vector is developed for the interface, where plastic flow direction is governed by the fractional gradient of yielding function. The developed interface model has eight constants, which can be all determined from laboratory tests. Further validation against a series of test results of different soil-structure interfaces shows that the developed model can well capture the constitutive behavior of the interface subjected to different boundary conditions. The typical normal-dilatancy and strain hardening/softening responses of the interface can be reasonably reproduced. (C) 2020 Elsevier Ltd. All rights reserved.