Pore pressure on a submarine pipeline in a cross-anisotropic nonhomogeneous seabed under water-wave loading

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Jeng, DS
Lin, YS
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1999
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Conventional investigations for the wave seabed pipe interaction problem have dealt with a uniform and isotropic seabed, despite the influences of anisotropic soil behaviour and variable soil characteristics. This paper proposes a finite-element model to investigate the effects of cross-anisotropic soil behaviour and variable soil characteristics (permeability and shear modulus) on the wave-induced oscillatory pore pressures on a submarine buried pipeline. The present model is verified with previous experimental data for the case of a uniform and isotropic seabed. The numerical results indicate that the effects of cross-anisotropic soil behaviour and variable soil characteristics on the pore pressure around the pipe surface cannot always be ignored. The maximum relative difference of pore pressure may reach 10% of the amplitude of the wave pressure at the seabed surface.Key words:pore pressure, pipeline, cross-anisotropic, nonhomogeneous

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Canadian Geotechnical Journal

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36

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3

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Civil engineering

Environmental engineering

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