Effect of Inherent Anisotropy on the Triaxial Compression Behavior of Coral Sand
Publication: International Journal of Geomechanics
Volume 23, Issue 5
Abstract
A series of triaxial tests were carried out on two types of coral sand to study the inherent anisotropy behavior under triaxial stress conditions. Notably, monotonic drained and undrained tests and cyclic drained tests were conducted. At the same time, the effect of inherent anisotropy on particle breakage and the relationship between the relative breakage and the input energy were investigated. The test results show that the coral sand demonstrates very evident anisotropic behavior under triaxial stress conditions. In the monotonic tests, the effective peak friction angle and compressibility of coral sand decrease with the depositional angle, and the anisotropic behavior is more significant at low confining pressures. The axial and volumetric strains of the low-depositional-angle specimens increase faster with the number of cycles in the cyclic drained tests. In addition, the relative breakage increases with the confining pressure but decreases with the depositional angle. A unique relationship exists between the relative breakage and the input energy for the specimens with the same depositional angle, but the relative breakage decreases with the depositional angle at the same input energy.
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Acknowledgments
The study was supported by the National Natural Science Foundation of China (Grant No. 51978305), which is gratefully acknowledged.
Notation
The following symbols are used in this paper:
- AR, S, and C
- aspect ratio, sphericity, and convexity;
- Br
- relative breakage (Hardin 1985);
- BrDsieve, BrDFmin, BrDFmax, and BrDeq
- relative breakage calculated by way of Dsieve, DFmax, DFmin, and Deq;
- Dr
- relative density;
- Dsieve, DFmax, DFmin, and Deq
- sieve diameter, maximum Feret diameter, minimum Feret diameter, and equivalent diameter;
- dɛ1 and dɛv
- axial and volumetric strain increment;
- E
- input energy per unit volume;
- E50
- secant modulus corresponding to 50% qf;
- Gs
- specific gravity;
- k
- coefficient of permeability;
- q
- deviator stress;
- qcyc
- maximum cyclic deviator stress;
- qf and q50
- deviator stress at failure and half of qf;
- u
- excess pore water pressure;
- ɛ1 and ɛv
- axial and volumetric strain;
- ɛ50
- axial strain corresponding to q50;
- θ
- depositional angle;
- ρmax/min
- maximum and minimum dry density;
- major effective principal stress;
- minor effective principal stress or confining pressure;
- φmax
- effective peak friction angle; and
- ψmax
- maximum dilation angle.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 23 • Issue 5 • May 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 10, 2022
Accepted: Nov 9, 2022
Published online: Feb 22, 2023
Published in print: May 1, 2023
Discussion open until: Jul 22, 2023
ASCE Technical Topics:
- Anisotropy
- Compressive strength
- Continuum mechanics
- Deformation (mechanics)
- Drainage
- Engineering fundamentals
- Engineering mechanics
- Geomechanics
- Geotechnical engineering
- Irrigation engineering
- Laboratory tests
- Material mechanics
- Material properties
- Materials engineering
- Soil compression
- Soil dynamics
- Soil mechanics
- Soil properties
- Soil stress
- Solid mechanics
- Strength of materials
- Structural mechanics
- Tests (by type)
- Triaxial loads
- Triaxial tests
- Water and water resources
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