Abstract Under cyclic loads, such as wave, earthquake, and traffic load, the direction of the principle stress axis rotates continuously in the soft foundation of embankment dam. However, the research conducted on stress-strain and stiffness characteristics of soft foundation in embankment dam under complex loads considering principal stress rotation was limited. In this paper, the deformation property of natural soft clay was investigated, with considering different inclined consolidation angles ζ and different intermediate principal stress coefficients b, by using GDS hollow cylindrical apparatus (HCA). It can be concluded from the test that, with the cycle number increasing, there are obvious differences in the axial stress-strain curves under different cycles, and the same as the torsional stress-strain curves under different cycles; the development of soil strain path is greatly affected by ζ value; the stiffness is significantly affected by ζ value and b value.

中文翻译：

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考虑不同初始状态的复杂应力路径下堤坝天然软基刚度退化

摘要 在波浪、地震、交通荷载等循环荷载作用下，路堤坝软基中主应力轴方向不断旋转。然而，对于考虑主应力旋转的复杂荷载作用下路堤坝软地基的应力-应变和刚度特性的研究是有限的。本文利用GDS空心圆柱装置(HCA)研究了天然软粘土的变形特性，考虑了不同的倾斜固结角ζ和不同的中间主应力系数b。由试验可知，随着循环次数的增加，不同循环下的轴向应力-应变曲线存在明显差异，不同循环下的扭转应力-应变曲线相同；ζ值对土壤应变路径的发展有很大影响；刚度受 ζ 值和 b 值的影响很大。