WAVE-INDUCED INSTABILITY IN SANDY SUBMARINE SEDIMENTS

概要

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The influences of the effective stress change induced by harmonic ocean waves on the stability of sandy submarine sediments in very gently sloped seafloors are examined. The general solution of the problem of flow through poro-elastic media and their deformation is represented by a linear combination of the solution of the Laplace equation and the diffusion equation (consolidation equation). The solution for horizontal seafloors is assumed to be approximately applicable to a very gently sloped planar seafloor. All possible arc failures are found by trial, using the slice method. The geometry of the possible instability is represented by the envelope of all the possible slides.The effective stress changes under the troughs towards the still water level of the storm waves in the direction of wave propagation can cause circular arc failures in sediments with Skempton's pore pressure coefficient, B, of less than 0.8,in water depths down to about 100 m. The length of the largest failure arc is of the order of 1/9〜2/9 of the wavelength, and the length of the composite failure zone can be about 3/4 of the half wavelength. The depths of the slip circle penetration can be of the order of the wave amplitude.
社団法人地盤工学会の論文
1987-12-15