Analysis of wave-induced liquefaction in seabed deposits of silt |
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| Authors: | Yu-feng Gao Yang Shen Jian Zhang Bing Li |
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| Institution: | c a Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China b Geotechnical Research Institute of Hohai University,Hohai university,Nanjing 210098,China c College of Civil Engineering,Southeast University,Nanjing 210096,China |
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| Abstract: | The dynamic stress introduced in half elastic space by wave loading is characterized by the equation between the magnitude
of half cyclic axial stress and cyclic torsion shear stress and the principal stress, whose direction rotates continuously
and compression stress on seabed can be calculated by the use of small amplitude wave theory. With relationship curves of
saturated silt of liquefaction cycles and cyclic stress ratios obtained by cyclic triaxial-torsional coupling shear tests
and curve fitting method to different data points of relative density, it is suggested that the cyclic stress ratio corresponding
to constant liquefaction impedance be taken as the critical cyclic stress ratio which implies liquefaction. There exists a
linear relationship between critical cyclic stress ratio and relative density under different relative densities. Empirical
formula for critical cyclic stress ratios of seabed liquefaction induced by wave loading under different relative densities
is established. The possibility of seabed silt liquefaction and its influence factors are analyzed based on the small-amplitude
wave theory and the data acquired in laboratory tests. |
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| Keywords: | wave loading seabed liquefaction silt triaxial-torsional coupling shear critical cyclic stress ratio |
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