主应力轴旋转对黄土动模量和阻尼比的影响

对各种不同初始状态下的黄土进行周期扭剪试验,研究主应力轴旋转对其动模量和阻尼比的影响规律,结果表明:黄土的最大动剪切模量随含水率的增大而减小,随着干密度的增大而增大;阻尼比随含水率增大而增大,随干密度的增大而减小。

The changing of dynamic shear modulus and damping ratio of loess under rotation of principal stress axes

Abstract： The changing laws of dynmaic shear modulus and damping ratios of unsaturated loess under rotation of principal stress axes with various moistures and dry density were tested by using dynamic torsional shear apparatus. The test results show that ： the maximal dynamic shear modulus increase with the increasing dry density and it decrease with the increasing water contents. The damping ratios increase with the increasing water contents and it decrease with the increasing dry density.