Shear deformation characteristics of sand in South China Sea revealed with digital image measurement system
DU Qizhi
ZHANG Hong
CHENG Sheng
SHAN Hongxian
Abstract：The digital image measurement technology is used to carry out the conventional triaxial test to obtain the deformation information each point of the sample surface during triaxial test,and analyze the shear deformation characteristics of samples.In this study,consolidation and drainage shear tests with different confining pressures and initial relative compactness were carried out on the soil from Shen Hu area in the South China Sea.The law of shear strength variation of sand was studied,and the law of shear deformation and failure of sand samples was emphatically discussed based on the digital image measurement system.The results showed that the sand in the South China Sea has different strain sof-tening characteristics at different confining pressures and compactness.The failure types of the samples were all"single-type".The shear band began to form at about 1/2 of the peak shear strength,and formed completely at the strain softening stage.The measured inclination of the shear band varied be-tween 53.5° and 56.5°,which was between the inclinations of the shear band calculated by Mohr-Cou-lomb and Roscoe theories,and Arthur criterion can better predict the inclination of the shear band.
Keywords：South China sea sanddigital image measurement systemshear bandcompactness
Publication Date：2023-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 27-33 )