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土的动剪切模量与阻尼比作为土动力特性研究的重要参数,一直备受关注。为了研究山西地区黄土的动力特性,对山西某土石坝坝基黄土进行了共振柱与动三轴试验,获得了在较大应变范围内的动剪切模量与阻尼比试验数据。试验结果表明,山西黄土动剪切模量与阻尼比均显著受初始含水率影响,其归一化的动剪切模量能够用修正的Hardin模型进行拟合,并给出了相关参数;阻尼比可以采用本文建议的公式进行拟合,拟合效果良好。最后,采用经验公式确定了不同围压下的最大动剪切模量的参数。
Dynamic shear modulus and damping ratio of soils have been paid much attention as an important parameter for the study of dynamic characteristics of soils. In order to study the dynamic characteristics of loess in Shanxi Province, the resonance column and dynamic triaxial tests on the loess foundation of an earth-rock dam in Shanxi Province were carried out. The experimental data of dynamic shear modulus and damping ratio were obtained in a large strain range. The experimental results show that the dynamic shear modulus and damping ratio of Shanxi loess are significantly affected by the initial water cut. The normalized dynamic shear modulus can be fitted with a modified Hardin model and the relevant parameters are given. Damping Than the formula proposed in this article can be fitted, the fitting effect is good. Finally, the empirical formula was used to determine the parameters of the maximum dynamic shear modulus under different confining pressures.