山西黄土动剪切模量与阻尼比试验研究

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。

Experimental Study on Dynamic Shear Module and Damping Ratio of Shanxi Area Loess

As important parameters of soil dynamic properties, dynamic shear module and damp- ing ratio of soil are always concerned extensively. In order to study the dynamic properties on lo- ess of Shanxi area, resonant column and dynamic triaxial tests were performed on loess from foundation of the earth-rock filled dam in Shanxi, dynamic shear modules and damping ratio data in relatively wide scope were obtained. Test results show that dynamic shear module and damp- ing ratio of Shanxi loess were pronounced affected by initial moisture content of specimen. Mean- while, normalized dynamic shear module could be well regressed by modified Hardin model, co- efficients of the regression are provided as well. Damping ratio could be regressed by the formula suggested by this paper, the result shows it is in good agreement. Moreover, the parameters of maximum dynamic shear module acquired through empirical equation are presented.