The accurate determination of anisotropic small-strain stiffness properties in natural soil deposits is of crucial importance in many geotechnical and geological engineering analyses. Accordingly, the main objective of this study is to propose an approach for evaluating the drained elastic stiffness parameters in saturated clays using the undrained properties. To attain this objective, by assuming cross-anisotropy in clayey soils, it is shown that two measured anisotropic components of shear moduli and the vertical component of Young's modulus in the undrained conditions possess the main contributions. They were then combined with a series of theoretical equations and empirical assumptions in the literature representing the relationships between the drained and undrained elastic parameters to yield the estimated values for the anisotropic drained Young's moduli. To verify the reliability of the suggested approach, the anisotropic elastic properties of 51 clayey soil specimens from 21 different soil types relating to 15 various sites in 4 countries were collected based on the experimental laboratory tests reported in literature. The anisotropic drained Young's moduli in each specimen were estimated through the proposed technique and then compared with directly measured ones with satisfactory agreement. The findings of this study may serve as the convenient references for economic and precise determination of in-situ elastic stiffness parameters in cohesive soil deposits using the non-invasive seismic surveying.

在许多岩土工程和地质工程分析中，准确确定天然土壤沉积物中的各向异性小应变刚度特性至关重要。因此，本研究的主要目的是提出一种利用不排水特性评估饱和粘土中排水弹性刚度参数的方法。为了实现这一目标，通过假设粘土中的交叉各向异性，表明在不排水条件下剪切模量的两个测量各向异性分量和杨氏模量的垂直分量具有主要贡献。然后将它们与代表排水和不排水弹性参数之间关系的文献中的一系列理论方程和经验假设相结合，以得出各向异性排水杨氏模量的估计值。为了验证所建​​议方法的可靠性，根据文献报道的实验室测试，收集了来自 4 个国家 15 个不同地点的 21 种不同土壤类型的 51 种粘土质土壤样品的各向异性弹性特性。通过所提出的技术估计每个试样中的各向异性排水杨氏模量，然后与直接测量的模量进行比较，结果令人满意。