Dynamic Characteristics of Nanjing Flake-Shaped Structural Sand in Long-Term Repeated Loading

Abstract eng:
The flake-shaped sand soils, containing quartz, chlorite and muscovite minerals, are widely distributed throughout the middle and lower reaches of the Yangtze River. Comparing with the standard quartz sand soils composed of circular-shaped particles, the flake-shaped structural sand has some differences in physical mechanics properties. The flake-shaped particle components give rise to the anisotropic property in physical mechanics properties of flake-shaped structural sand, and its strength in horizontal direction is smaller than that of vertical direction. Moreover, some preliminary researches indicate that the flake-shaped structures have a large effect on liquidation properties of sand, and its dynamic shear modulus and damp properties also have marked differences from the standard quartz sand. So, a series of dynamic characteristics tests on flake-shaped sand was performed by using the WFI cyclic triaxial apparatus made in England. The dynamic characteristics of flake-shaped sand under different cell pressure, initial static deviator stress and axial cyclic stress ratio, were studied and its influence regularity was analyzed. In addition, through comparing the effective stress path under cyclic loading with static loading, the process of liquefaction of saturated Nanjing flake-shaped sand with development of dynamic pore-water pressure, including stable state, compression state, dilative state and dynamic stress-strain behavior, were investigated. And two kinds of failure patterns of saturated Nanjing flake-shaped sand were provided.

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