中文摘要：

以吕梁压实黄土为研究对象,通过大量动三轴试验,研究了含水率、干密度、围压和固结应力比等因素对压实黄土动剪切模量和阻尼比的影响。结果表明：压实黄土的动剪切模量随动剪应变的增大而减小,可用半对数坐标系下的直线方程进行拟合;动剪切模量和初始动剪切模量均随含水率的增大而减小,随干密度、围压和固结应力比的增大而增大;固结应力比对动剪切模量的影响随着动剪应变的增大而减弱;阻尼比大致上随着含水率的增大呈缓慢增大趋势,随着干密度、围压和固结应力比的增大呈缓慢减小趋势。进行压实黄土的动力研究,对高烈度黄土地区的大规模基础建设具有重要的理论和现实意义。

英文摘要：

The Lvliang compacted loess is selected in this paper as the research object. Through a large number of dynamic triaxial tests,the dynamic shear modulus and damping ratio of compacted loess under the moisture content,dry density,confining pressure and consolidation stress ratio are examined. The results show that the dynamic shear modulus of the compacted loess decreases with the increasing of dynamic shear strain.We can use linear equations under a semi-logarithmic coordinates to fit their relationship. The dynamic shear modulus and initial dynamic shear modulus decrease with the increasing moisture content and increase with the increasing dry density,confining pressure and consolidation stress ratio. The consolidation stress ratio has less effect on the dynamic shear modulus with the increasing dynamic shear strain. Damping ratio generally show a slowly increasing trend with the increasing moisture content,and show a slowly decreasing trend with the increasing dry density,confining pressure and consolidation stress ratio. Dynamic researches on the compacted loess are of important theoretical and practical significance for building large-scale infrastructure in loess areas of high seismic intensity.