Abstract

In offshore engineering, the soft marine clay beneath an embankment may be subjected to anisotropic consolidation stress paths, which greatly affect its monotonic and post-cyclic shear behavior. In this study, the post-cyclic undrained shear behavior of anisotropically consolidated soft marine clay was investigated by conducting a series of monotonic and post-cyclic shear triaxial tests. First, the post-cyclic undrained shear behaviors, including the stress–strain, pore water pressure, and effective stress paths, were investigated by comparing the results of the monotonic tests. Then, the degradation of the post-cyclic undrained shear strength was analyzed. Finally, an empirical prediction model of the post-cyclic anisotropy strength was proposed based on the definition of equivalent overconsolidation.

摘要

在海洋工程中，路堤下的软海相粘土可能会受到各向异性固结应力路径的影响，这极大地影响了其单调和后循环剪切行为。在这项研究中，通过进行一系列单调和循环后剪切三轴试验，研究了各向异性固结软海相粘土的循环后不排水剪切行为。首先，通过比较单调试验的结果，研究了循环后不排水剪切行为，包括应力-应变、孔隙水压力和有效应力路径。然后，分析了循环后不排水剪切强度的退化。最后，基于等效超固结的定义，提出了循环后各向异性强度的经验预测模型。