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Mechanism study of the evolution of quasi-elasticity of granular soil during cyclic loading

机译：Mechanism study of the evolution of quasi-elasticity of granular soil during cyclic loading

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摘要

Elasticity test of soil, which is based on small-strain deformation test, is a big challenge in geomechanical laboratory testing due to the limitation of current state-of-art laboratory deformation control and measurement technique. The hysteresis loop generated by un-/reload process of soil testing, which is regarded as the quasi-elastic process of soil, is conventionally believed to be unable representing the real elastic properties of soil unlike the ideal elastoplastic material. In this study, it is hypothesized that the quasi-elastic process of granular soil would evolve with cyclic loading and can represent the elastic properties of granular soil reasonably after sufficient number of cyclic loading and reaching steady state. Therefore, the cyclic triaxial test can be used as an alternative method to detect the elastic response of granular soil. Three-dimensional discrete element method (DEM) simulations of the cyclic triaxial test are conducted to illustrate the evolution of quasi-elastic response of soil and validate the hypothesis. Simulation results show that the elastic modulus detected through elastic probe test (small-strain deformation test) is insensitive to the structure change during cyclic shear and almost invariant at its corresponding stress level and the deformation modulus measured at the quasi-elastic process of granular soil asymptotically approaches the elastic modulus with the increase number of cyclic loading. Through the thermodynamic analysis of DEM, this evolution of quasi-elasticity of granular soil can be attributed to the energy dissipation due to the sliding events between particle contacts. When the energy dissipation of the quasi-elastic process reaches a steady-state level after sufficient number of cyclic loading, its value is comparable to the energy dissipation of the elastic probe test and thus the quasi-elastic process can be used to represent the elastic response of granular soil. This study provides a conceptual exploration of essential mechanism of elastic response of granular soil. More comprehensive laboratory tests and DEM simulations are expected for fully understanding of the hypothesized mechanism in the future study.

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