Characteristics of pore water pressure of saturated silt under wave loading
CHINA OCEAN ENGINEERING(2010)
摘要
The characteristics of dynamic stress in the seabed under wave loading are constant principal stress and continuous rotation of the principal stress direction. Cyclic triaxial-torsional coupling shear tests were performed on saturated silt by the hollow cylinder apparatus under different relative densities, deviator stress ratios and vibration frequencies to study the development of pore water pressure of the saturated silt under wave loading. It was found that the development of pore water pressure follows the trend of "fast similar to steady similar to drastic". The turning point from fast to steady stage is not affected by relative density and deviator stress ratio. However, the turning point front steady to drastic stage relies on relative density and deviator stress ratio. The vibration cycle for the liquefaction of saturated silt decreases with increasing deviator stress ratio and increases with relative density. The vibration cycle for the liquefaction of the saturated silt increases with vibration frequency and reaches a peak value, after which it decreases with increasing vibration frequency for the relative density of 70%. But the vibration cycle for the liquefaction of saturated silt increases with vibration frequency for the relative density of 30%. The development of pore water pressure of the saturated silt is influenced by relative density and vibration frequency.
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关键词
silt,wave loading,pore water pressure,vibration frequency,cyclic triaxial-torsional coupling shear,rotation of principal stress
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