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Stress attractors predicted by a high-cycle accumulation model confirmed by undrained cyclic triaxial tests

机译：通过不排水的循环三轴试验确认的高周期累积模型预测的应力吸引子

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Depending on the boundary conditions a high-cyclic loading (=large number of cycles N >= 10(3), small strain amplitudes epsilon(amPl) <= 10(-3)) may either lead to strain accumulation or stress relaxation in the soil. This paper concentrates on stress relaxation. For a cyclic loading applied under undrained triaxial conditions, the high-cycle accumulation (HCA) model of Niemunis et al. [23] predicts a relaxation of average effective stress until a stress ratio nay = qav p =Mcc (triaxial compression) or Mec (extension) is reached. Mcc and Mec are very similar to the critical stress ratios Mc and Me known from monotonic shear tests. The average effective stresses finally reached after a sufficiently large number of cycles are called "stress attractors" herein. A zero effective stress state (liquefaction, pay = qav =0) is obtained as a special case of a stress attractor. However, up to now the stress attractors predicted by the HCA model were based on the data from drained cyclic tests only. In the present study they have been approximately confirmed by stress relaxation experiments, i.e. undrained cyclic triaxial tests with stress or strain control. These tests have been performed on a fine sand, varying the initial values of density, mean pressure and stress ratio as well as the stress or strain amplitude. (C) 2014 Elsevier Ltd. All rights reserved.
机译：取决于边界条件，高循环载荷（=循环次数N> = 10（3），小的应变幅度epsilon（amPl）<= 10（-3））可能会导致应变累积或应力松弛。泥。本文着重于应力松弛。对于在不排水的三轴条件下施加的循环载荷，Niemunis等人的高循环累积（HCA）模型。 [23]预测平均有效应力会有所松弛，直到达到应力比nay = qav p = Mcc（三轴压缩）或Mec（延伸）。 Mcc和Mec与单调剪切试验中已知的临界应力比Mc和Me非常相似。在足够数量的循环之后最终达到的平均有效应力在此称为“应力吸引器”。作为应力吸引器的特殊情况，获得了零有效应力状态（液化，pay = qav = 0）。但是，到目前为止，由HCA模型预测的应力吸引子仅基于排水循环试验的数据。在本研究中，它们已通过应力松弛实验（即通过应力或应变控制的不排水循环三轴试验）得到了大致确认。这些测试是在细砂上进行的，改变了密度，平均压力和应力比以及应力或应变幅度的初始值。 （C）2014 Elsevier Ltd.保留所有权利。

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