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.

中文翻译：

---

基于软粘土刚度退化模型预测吸力锚的循环行为

摘要 在软粘土中承受平均载荷和循环载荷的吸力锚的性能是其设计中的一个重要考虑因素。一种新的数值计算方法是基于软粘土刚度退化模型开发的，该模型是通过执行一系列不排水循环三轴试验提出的，并通过编码 USDFLD 子程序和定义相关场变量嵌入到 ABAQUS 软件包中。该数值方法通过将完美弹塑性模型与 Mohr-Coulomb 屈服准则耦合，以及所提出的刚度退化模型来预测吸力锚杆的循环行为，该模型可以反映循环过程中锚杆周围土体的刚度退化和塑性变形的积累。加载。通过与软粘土中承受平均荷载和循环荷载联合作用的吸力锚模型试验结果的比较，验证了该数值方法。所提出的方法可以预测循环变形和承载力，并捕获软粘土中吸力锚的载荷-位移响应的非线性、滞后和循环累积特性。