Dynamic properties of Beaufort Sea soils

Yang, Dan (1992) Dynamic properties of Beaufort Sea soils. Masters thesis, Memorial University of Newfoundland.

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Abstract

A study of the deformation behavior of marine soil subjected to long term cyclic loading is presented in this thesis. The study includes both experimental data and analytical predictions. Constitutive relationships relevant to time-dependent deformation behavior of marine cohesive soil under long term cyclic loading are derived based on a number of classic rheological models. The experimental method for determining the creep function is described. Long term cyclic loading tests were conducted on a load-controlled cyclic triaxial system. The theoretical predictions of the deformations are presented and compared to laboratory results. The potential applications of each rheological model to marine geotechnical engineering are discussed. -- This thesis also presents the results of an investigation performed to study the liquefaction potential or cyclic strength of four soils from the Beaufort Sea and one from Newfoundland. Results from the different soils are compared under different drainage conditions and overconsolidation ratios. The effects of cyclic stress ratio, dilatancy and mean particle size were also studied and are presented. The stress-strain relationships of the soils are demonstrated and discussed. -- An understanding of the stability threshold and dynamic stiffness behavior of marine soils under cyclic loading is required in the dynamic analysis of offshore structures subjected to earthquake excitation or storm wave action. Therefore, the third objective of this experimental investigation was to quantify the stability threshold and dynamic modulus for saturated Beaufort Sea soils under different over-consolidation ratios. The laboratory experiments were conducted on a load-controlled cyclic triaxial system.

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