In order to study the cyclic behavior of saturated marine clay under uniform and non-uniform wave loading,a series of undrained tests were conducted using the GDS hollow cylinder torsional shear apparatus.Under the same initial consolidation state,circular and helical stress paths with different maximum deviatoric stresses qmax and minimum deviatoric stresses qmin were applied to the specimens during axial-torsion combined cyclic loading.The influence of these two different stress paths on the cyclic stress ratio RCS and cyclic pore pressure ratio δ=qmin/qmax on the dynamic properties of the soil during cyclic loading with consideration of the rotation of the principal stress axis was analyzed.The experimental results indicate that an increase in RCS and δ both enhance the pore pressure,axial strain,shear strain,and their rates of increase in clay under wave loading,while also leading to more severe attenuation of the axial rebound modulus and dynamic shear modulus of the soil.The effect of δ increases with the increase of RCS.When RCS≤0.05,the soil remains an"elastically stable or plastically stable"state during cycling.However,when RCS≥0.06,the soil may be in a"fatigue failure"or"plastic creep"state,the specific form of which is jointly determined by RCS and δ.The axial rebound modulus and dynamic shear modulus of the soil during the cycling process approximate a certain proportion.
non-uniform wave loadingsaturated claycyclic stress ratiorotation of principal stress axis
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