Mechanical behavior and particle breakage of calcareous sand in triaxial test

Calcareous sands typically have wider ring grain shapes, significant intragranular porosity, complex structure, and lower grain hardness, which pose a risk when used as the foundation, breakwaters, and backfill material in construction. Hence, the calcareous sand was subjected to multiple triaxial s...

Full description

Saved in:
Bibliographic Details
Published in:Marine geophysical researches 2023-09, Vol.44 (3), p.18, Article 18
Main Authors: Lyu, Haibo, Gu, Jianxiao, Zhou, Jianrong, Li, Bo
Format: Article
Language:English
Subjects:
Breakwaters
Earth and Environmental Science
Earth Sciences
East Sea
Evolution
Geophysics/Geodesy
Grain shape
Grain size
Hydrostatic pressure
Oceanography
Offshore Engineering
Original Research Paper
Particle size
Pore pressure
Pore water
Porosity
Pressure changes
Sand
Shear
Shear tests
Size distribution
Special Issue: Geological implications for submarine geohazards
Ulleung Basin
Water hardness
Water pressure
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Calcareous sands typically have wider ring grain shapes, significant intragranular porosity, complex structure, and lower grain hardness, which pose a risk when used as the foundation, breakwaters, and backfill material in construction. Hence, the calcareous sand was subjected to multiple triaxial shear tests under different confining pressures. Firstly, the triaxial test is conducted under confining pressure of 100–1200 kPa to investigate the effect of confining pressure on the shear characteristics. It noted that more contraction with confining pressure increases caused by the easy breakage of particles under a high confining pressure. Then, the grain size distribution test is conducted to characterize the particle breakage with the results of grain size distribution curves and relative particle breakage index. A linear relationship is established between relative particle breakage index and confining pressure. Secondly, the results of triaxial test are analyzed to investigate the mechanical behavior, volumetric behavior, and strength parameters. The dilative volume or pore water pressure changes are most pronounced at low confining pressure and high-stress levels approaching failure. In addition, an equation is defined to describe tangential stiffness modulus evolution. The effect of confining pressure was converted to relative particle breakage index to illustrate the tangential stiffness modulus evolution better.
ISSN:0025-3235
1573-0581
DOI:10.1007/s11001-023-09525-0