Small-strain constrained elastic modulus of clean quartz sand with various grain size distribution
Small-strain constrained elastic modulus of clean quartz sand with various grain size distribution
复制标题
DOI：
10.1016/j.soildyn.2013.08.006
复制
发表时间：
2013-12
影响因子：
4
通讯作者：
T. Wichtmann;T. Triantafyllidis
中科院分区：
文献类型：
--
作者：
T. Wichtmann;T. Triantafyllidis
约对19个具有分段线性、间隙级配、S形或其他光滑形状粒度分布曲线的石英砂进行了120个共振柱（RC）试验，并使用压电元件进行了附加P波速度测量。对于每种材料，测试不同的压力和密度。它表明，作者在早期的论文中提出的小应变约束弹性模量的扩展经验方程的工作也为大多数更复杂的粒度分布曲线在本研究中测试。根据线性级配试验数据，建立了考虑粒度分布曲线均匀系数影响的公式。如果将相关方程与粒度分布曲线的一个特殊定义的平均倾角一起应用，则可以实现对更复杂的粒度分布的预测的进一步改进。这种改善不仅表现为小应变约束的弹性模量，而且还表现为小应变剪切模量，模量退化和泊松比。
Approx. 120 resonant column (RC) tests with additional P-wave velocity measurements using piezoelectric elements have been performed on 19 clean quartz sands with piecewise linear, gap-graded, S-shaped or other smoothly shaped grain size distribution curves. For each material different pressures and densities were tested. It is demonstrated that the extended empirical equations for the small-strain constrained elastic modulus proposed by the authors in an earlier paper work well also for most of the more complex grain size distribution curves tested in the present study. These equations considering the influence of the uniformity coefficient of the grain size distribution curve were developed based on the data from tests on linear gradations. A further improvement of the prediction for the more complex grain size distributions can be achieved if the correlation equations are applied with a specially defined average inclination of the grain size distribution curve. Such an improvement is demonstrated not only for the small-strain constrained elastic modulus, but also for small-strain shear modulus, modulus degradation and Poisson's ratio.