期刊
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
卷 34, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.gete.2023.100457
关键词
Strain ratio; Poisson?s ratio; Quasi-elastic deformation state; Quasi-elastic dilatancy; Discrete element method; Cyclic triaxial tests; Digital image measurement
This paper introduces a concept of strain ratio for granular soils under quasi-elastic state and measures it through experimental tests. It is found that the strain ratio is consistent with Poisson's ratio only in the initial shear stage, but there is a significant deviation in subsequent shearing.
Poisson's ratio, besides its transverse-axial strain ratio definition, also plays a significant role in traditional elastic theory as an elastic constant. However, this elastic role of Poisson's ratio faces a challenge when applied to granular soils. A so-called strain ratiois therefore introduced and measured in this paper for granular soils under quasi-elastic state. With the same definition of the transverse-axial strain ratio as Poisson's ratio, the strain ratio is investigated under cyclic triaxial tests for its stress-state dependency. The results show that Poisson's ratio is consistent with strain ratio only in the initial state of shear, and there is a non-negligible deviation in subsequent shear. The conversion relationship of elastic constants does not hold for the strain ratio with increasing deviator stress. A special case is analyzed when the strain ratio is greater than 0.5 and the specimen is subject to a quasi-elastic shear dilatancy. Discrete element simulations are conducted to clarify the microscopic mechanism of quasi-elastic dilatancy by tracking the evolution of the contact number of particles and the trajectory of the contact. This study provides new insights in understanding the elastic behavior of granular soils. (c) 2023 Elsevier Ltd. All rights reserved.
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