The main focus of this research is to obtain the dynamic properties of Firouzkooh sand and to study the effect of different factors, including specimen fabric, relative density, and consolidation anisotropy on those parameters. Dynamic properties, including shear modulus and damping ratio, play a significant role in predicting the dynamic response of soil. Having a correct estimate of those parameters in a wide strain range is essential for laboratory research and modeling. Thus, a laboratory testing program comprising of 116 experiments, including bender element and cyclic triaxial tests, was defined to obtain these properties in the strain range of 10^–6 up to 10^–2. During these tests, effective stress was in the range of 20–500 kPa and the relative density was between 16 and 74.2%. To study the effect of the type of specimen fabric, the sample preparation method was either dry deposition or wet tamping. At the same time, some tests were conducted with anisotropic consolidation. Results are presented in forms of shear modulus and damping ratio in relation to shear strain. Many of the previous studies conducted on different types of sands show consistent results. Additionally, a versatile preliminary empirical model, based on the previously proposed methods, is suggested to predict shear modulus and damping ratio curves of Firouzkooh sand, taking into account the sample fabric and consolidation method.

本研究的主要重点是获得 Firouzkooh 砂的动态特性，并研究不同因素对这些参数的影响，包括试样结构、相对密度和固结各向异性。动态特性，包括剪切模量和阻尼比，在预测土壤的动态响应方面起着重要作用。在较宽的应变范围内正确估计这些参数对于实验室研究和建模至关重要。因此，定义了一个由 116 个实验组成的实验室测试程序，包括弯曲元件和循环三轴测试，以在 10 ^–6至 10 ^–2的应变范围内获得这些特性. 在这些测试中，有效应力在 20-500 kPa 的范围内，相对密度在 16-74.2% 之间。为了研究样品织物类型的影响，样品制备方法是干沉积或湿夯。同时，还进行了一些各向异性固结试验。结果以与剪切应变相关的剪切模量和阻尼比的形式呈现。以前对不同类型的沙子进行的许多研究都显示出一致的结果。此外，基于先前提出的方法，建议使用通用的初步经验模型来预测 Firouzkooh 砂的剪切模量和阻尼比曲线，同时考虑到样品织物和固结方法。