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Investigating the dynamic characteristics of seabed soil under complex vibrations or cyclic loads such as waves and earthquakes is important for analyzing the dynamic response and stability of the foundations of marine geotechnical structures. This paper presents an experimental investigation on the dynamic shear modulus ( G ) of saturated marine sandy silt subjected to various initial consolidation conditions and cyclic loading patterns. The initial consolidation condition is characterized by the initial effective mean principal stress  P0'  and the stress ratio of anisotropic consolidation  R0  (=  σ1 / σ3 ), and the cyclic loading pattern is described quantitatively by the ellipse ratio of elliptical stress path ( δ ) and the orientation angle of major principal stress of linear stress path ( α0 ). A remarkable finding is that the maximum dynamic shear modulus  Gmax  and  G / Gmax – γ zθ  curve is affected significantly by the initial consolidation condition ( P0 ′ or  R0 ) but is insensitive to changes in the cyclic loading pattern ( δ  and  α0 ).  Gmax  increases with increasing  P0 ′ or  R0 , and the nonlinearity of the  G / Gmax – γ zθ  curve decreases with increasing  P0 ′ or  R0 . The control parameters  Gmax  and reference torsional shear strain  γr  of the modified hyperbolic model usually known as the KZS model are related linearly to the synthesizing initial consolidation state parameters ( P0 ′/ Pa )( R0 ) 0.5  and ( P0 ′/ Pa ) 0.5R0 , respectively. A wide-strain-range  G  evaluation method with comprehensive consideration of the initial consolidation condition and the cyclic loading pattern was established, and the applicability of the proposed method was verified.

Reduction of dynamic shear modulus of saturated marine sandy silt under complex stress conditions