Abstract
This study aims to investigate the effect of consolidation shear stress magnitude on the shear behaviour and non-coaxiality of soils. In previous drained bi-directional simple shear test on Leighton Buzzard sand, it is showed that the level of non-coaxiality, which is indicated by the angle difference between the principal axes of stresses and the corresponding principal axes of strain rate tensors, is increased by increasing angle difference between the direction of consolidation shear stress and secondary shearing. This paper further investigated the relation and includes results with higher consolidation shear stresses. Results agree with the previous relation, and further showed that increasing consolidation shear stresses decreased the level of non-coaxiality in tests with angle difference between 0° and 90°, and increased the level of non-coaxiality in tests with angle difference between 90° and 180°.
Highlights
In experiment and numerical modelling, it is showed that the principal axes of stresses and the corresponding principal axes of strain rate tensors often do not coincide [1,2,3,4]
In tests conducted by Li et al [11] using the first commercially available variable direction dynamic cyclic simple shear system (VDDCSS), a procedure is introduced in determining the rotation angle of principal axes of stresses and plastic strain rate using data obtained from a typical bi-directional simple shear test
The same testing device (VDDCSS), testing material (Leighton Buzzard sand Fraction B), sample reconstitution method and testing method are used in this study as those used by Li et al [11,12,13,14]
Summary
In experiment and numerical modelling, it is showed that the principal axes of stresses and the corresponding principal axes of strain rate tensors often do not coincide [1,2,3,4]. In most of numerical modelling soil models, these axes are considered as generally coincident, which neglects the non-coaxiality and may lead to unsafe simulation results [5,6,7,8,9,10]. In tests conducted by Li et al [11] using the first commercially available variable direction dynamic cyclic simple shear system (VDDCSS), a procedure is introduced in determining the rotation angle of principal axes of stresses and plastic strain rate using data obtained from a typical bi-directional simple shear test.
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