Cyclic DSS tests for the evaluation of stress densification effects in liquefaction assessment
Cyclic DSS tests for the evaluation of stress densification effects in liquefaction assessment
复制标题
用于评估液化评估中应力致密化效应的循环 DSS 测试
DOI：
10.1016/j.soildyn.2015.03.016
复制
发表时间：
2015
影响因子：
4
通讯作者：
A. Fourie
中科院分区：
文献类型：
--
作者：
A. Fonseca;M. Soares;A. Fourie
为了评估在主应力旋转的循环加载下循环阻力比（“CRR”）的应力校正因子，对两种砂进行了86次循环直接简单剪切（CDSS）试验，一种来自阿尔及利亚Alger的Ain Beniam，另一种来自葡萄牙科英布拉。这些砂具有独特的颗粒形状和尺寸分布，并在不同的相对密度和不同的初始有效围压下进行了测试。在初始静剪应力为零的情况下进行的试验结果--因此静剪应力系数K α等于1--表明，目前推荐的围压水平修正系数Kσ值似乎低估了循环抗力。
To evaluate the stress correction factor for the Cyclic Resistance Ratio (“CRR”) under cyclic loading with principal stress rotation, 86 Cyclic Direct Simple Shear (CDSS) tests were performed on two sands, one from Ain Beniam, in Alger, Algeria, and another from Coimbra, Portugal. These sands have distinctive grain shapes and size distributions and were tested with various relative densities and under different initial effective confining stresses. The results of the tests performed with zero initial static shear stress – therefore with the static shear stress factorKαequal to one – indicate that the values of confining stress level correction factor,Kσ, as currently recommended, seem to underestimate the cyclic resistance.