期刊
ENGINEERING GEOLOGY
卷 280, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.enggeo.2020.105932
关键词
Calcareous sand; Particle crushing; Critical state; Shear strength; State bounding surface
资金
- National Natural Science Foundation of China [51908153, 41572297]
- Guangzhou City Technology and Science Program [201904010278]
- Open fund of Key Laboratory of Earthquake Engineering and Engineering Vibration, China Earthquake Administration [2020D01]
This study investigated the mechanical properties and particle crushing behavior of calcareous sand. Experimental results showed that the amount of particle crushing in calcareous sand increased with higher density and confining stress. The shear response of calcareous sand was well interpreted within the critical state framework based on experimental data and analysis.
Calcareous sand containing weak particles originated from the deposition of skeletal residue of marine organisms is susceptible to significant particle crushing under compression and shearing. The breakage of grains results in excessive deformation and foundation failure. This study focuses on the mechanical properties and particle crushing of calcareous sand retrieved from Nansha Island, South China Sea. A series of isotropically drained and undrained triaxial compression tests were performed on reconstituted calcareous sand samples at different initial densities and at a wide range of confining stresses. The amount of particle crushing for calcareous sand after shearing was measured and quantified. Experimental results demonstrate that the shear response of calcareous sand had been well interpreted within the critical state framework. The amount of particle crushing for calcareous sand increases with increasing density and confining stress. Compared with the undrained condition, a larger amount of particle crushing of calcareous sands is observed in the drained triaxial compression test. Stress-dilatancy curves exhibit similar varying tendency for calcareous sand. Multiple critical state lines for calcareous sands with different initial densities are identified in the void ratio and logarithm of the mean stress plane. Considering the variation in stress ratio at the critical state induced by particle crushing, all stress paths are normalized to determine the state bounding surface for calcareous sand at varying densities and stresses.
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