EXPRIMENTAL STUDY ON DYNAMIC CHARACTERISTICS OF MUDDY SOIL IN FUZHOU

As the rapid development of highway, railway and urban rail transit project, soft ground settlement caused by the long-term cyclic dynamic load has been paid more and more attention. The dynamic triaxial tests to measure the dynamic characteristic of muddy soil were conducted on samples from Fuzhou. A series of changing regulations of dynamic stress, dynamic strength, dynamic shear modulus and damping ratios were analyzed. The effects of consolidation pressure and dynamic stress amplitude on the dynamic strength of muddy soil were investigated respectively. A relationship among dynamic strength, consolidation pressure and vibration numbers is developed, by which the dynamic strength of soil in different depth can be estimated. The experimental results show that, the dynamic strength falls as the cycle of the dynamic loading increases, and it increases as consolidation pressure increases. It should be noticed that the values of dynamic strength is low. Finally, the values of dynamic shear modulus and damping ratios are given.