Correlation Study for Triaxial Stress Wave Testing with Theoretical Models on Wave Velocities

• Main Authors: Hsui-Wei Hsu, 許修維
• Other Authors: Der—Wen Chang
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/43035697231956772449

碩士 === 淡江大學 === 土木工程學系 === 87 === The objective of this study, with the results of the uniaxial stress—strain relationships from the elastic axial—symmetric coordination, stress wave measuring, and data interpretations, is to understand the effects of the degree of saturation and the void ratio on the compressive and the shear wave velocities of undrained soils under uniaxial, isotropic and triaxial compressions. It is hoped that the results of this study can be helpful to the soil dynamics study and suggests some useful parameters and empirical functions. By comparing the test results, it observed that the effects of the degree of saturation and the state of stress are important to the compressive velocities. Especially when the degree of saturation > 85%, the compressive wave velocities will increase apparently with the increase of the degree of saturation; but the shear wave velocities will decrease by increasing the degree of saturation or decreasing the void ratio. Besides, the Bulk modulus of the soil will become larger with the confining pressure or the axial pressure. After testing and data interpretation of triaxial stress wave measurements, the results of the uniaxial stress—strain relationships from the elastic axial—symmetric coordination are different to the static stress—strain relationships. Results indicate that the soil structure behavior is different from the dynamic characters of the soil materials. The deformation of the specimen dominates the static modulus of the material.