Small-Strain Nonlinearity of Normally Consolidated Clay
Small-Strain Nonlinearity of Normally Consolidated Clay
复制标题
DOI：
10.1061/(asce)1090-0241(2007)133:1(72
复制
发表时间：
2007
影响因子：
3.9
通讯作者：
M. Santagata;J. Germaine;C. Ladd
中科院分区：
文献类型：
--
作者：
M. Santagata;J. Germaine;C. Ladd
本文讨论了小应变不排水剪切特性的粘土的基础上进行了广泛的试验程序正常固结再沉积波士顿蓝粘土（RBBC）。这种土的特性的均匀性和再现性允许详细研究固结应力水平、预压固结应力路径、预压侧应力比（K）、剪切速率和实验室老化时间对不排水三轴压缩中小应变（ea ≤0.1%）非线性的作用。正常固结（NC）RBBC的小应变行为测量使用LVDT为基础的设备，能够解决试样轴向应变小于0.0001%的应变超过10%的应变范围内，从而允许充分描述的小应变非线性。测试程序依赖于多阶段测试方法，以最大限度地减少样本变异性并缩短测试时间。结果表明，NC RBBC的小应变非线性与孔隙比和应力水平无关。
This paper addresses the small-strain undrained shear behavior of clays based on an extensive testing program conducted on normally consolidated resedimented Boston blue clay (RBBC). The uniformity and reproducibility in the behavior of this soil permit a detailed study of the role of consolidation stress level, preshear consolidation stress path, preshear lateral stress ratio (K) , rate of shear, and duration of laboratory aging on the small-strain ( ea ≤0.1%) nonlinearity in undrained triaxial compression. The small-strain behavior of normally consolidated (NC) RBBC is measured using a LVDT-based device that is capable of resolving on-specimen axial strains smaller than 0.0001% strain over a 10% strain range, thus allowing full description of the small-strain nonlinearity. The testing program relies on a multistage testing approach developed to minimize specimen variability and reduce testing time. The small-strain nonlinearity of NC RBBC is found to be virtually independent of void ratio or stress leve...