Abstract
Abstract The behaviour of suction anchors subjected to combined average and cyclic loads in soft clays is an essential consideration in their design. A new numerical computation method was developed based on a stiffness degradation model for soft clay that was proposed by performing a series of undrained cyclic triaxial tests and embedded in the ABAQUS software package by encoding the USDFLD subroutine and defining relevant field variables. The numerical method predicts the cyclic behaviour of suction anchors by coupling the elastic-perfectly plastic model with the Mohr-Coulomb yield criterion and the proposed stiffness degradation model that can reflect the stiffness degradation and the accumulation of plastic deformation of soils around the anchor during cyclic loading. The numerical method was verified by a comparison with the model test results of suction anchors subjected to combined average and cyclic loads in soft clays. The proposed method can predict the cyclic deformation as well as the bearing capacity and capture the nonlinearity, hysteresis and cyclic accumulation characteristics of the load-displacement responses of suction anchors in soft clays.
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