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The objective of this paper is to describe a new technique for measurement of the poro-elasticity of marine sediments in the laboratory. This technique enables one to determine the composite poro-elasticity factor α′ in one test setup as a function of controlling environmental factors such as stress state and load frequency. α′ includes shear modulus, Poisson's ratio, and hydraulic conductivity of the soil and compressibility and unit weight of the fluid along with frequency of wave loading and a characteristic dimension. The determination of α′ is based on the measurement of pore pressure at different depths in a confined cylindrical specimen. The theoretical basis of the test procedure, the method of analysis of the test results, and the appropriate test boundary conditions for different soils are presented. The results of tests performed on a nonplastic silt soil indicate that the proposed technique provides an efficient means of determining poro-elasticity of marine soils.
pore-water pressures, laboratory tests, hydraulic conductivity, marine soils, offshore structures, wave loading, wave-induced response, poro-elasticity, shear modulus, Poisson's ratio
Professor, University of Wisconsin, Madison, WI
Lecturer, Bandung Institute of Technology, Bandung,