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Title:: Study on Experiment of Dynamic Shear Module and Damping Ration of Loess in Chengde of Hebei

Author(s):: WEI Lianyu¹; LI Hui¹; DONG Liying¹; FENG Lei¹; (1. School of Civil Engineering, Hebei University of Technology, Tianjin 300401, China)(2.Tianjin Urban Construction Design Institute, Tianjin 300122, China)

Keywords:: Chengdo in Hebei; loess; dynamic triaxial test; dynamic shear module; damping ratio; moisture content; dry density

摘要:: 为研究河北承德黄土的动力学特性,开展了该地区路基土的室内动三轴试验,得出了承德黄土动剪切模量和动阻尼比的变化规律。结果表明:动剪切模量随干密度的增加和含水率的降低而增大,干密度越大,最大动剪切模量随含水率增加而降低的幅度越大; 含水率越高,最大动剪切模量随干密度增加而增大的幅度越小。阻尼比随动剪应变增加而增大,可用本文推荐的公式进行拟合,拟合效果良好。相同条件下,承德黄土的最大动剪切模量远小于中西部地区,阻尼比增长速率大于中西部地区。

Abstract:: In order to study the dynamic characteristic of loess in Chengde of Hebei, we performed the dynamic triaxial test on subgrade loess, and obtained the variation laws of dynamic shear modulus and damping ration of loess in Chengde. The results show that the dynamic shear modulus increases with the increase of dry density and the decrease of moisture content. The larger the dry density is, the decrease amplitude of maximum dynamic shear modulus is larger with increase of moisture content. The higher the moisture content is, the increase amplitude of maximum dynamic shear modulus is smaller with increase of moisture content. The damping ratios increase with the increase of dynamic shear strain, it could be regressed by the formula suggested by this paper, and the fitting result is in good agreement. Under the same conditions, the maximum dynamic shear modulus of loess in Chengde is much smaller than that in central and western regions, and the increase rate of damping ration of loess in Chengde is larger than that in central and western regions.