【摘要】 土的动剪切模量G和阻尼比D是描述土体动力特性的两个主要参数。利用GDS共振柱试验系统对不同细粒含量的非饱和黄土开展了动力学参数试验研究。结果表明,用Hardin-Drnevich双曲线模型能够较好地拟合G、G/Gmax随剪应变γ的变化趋势;在其它条件相同时,G随细粒含量的增加而减小,阻尼比D与细粒含量的变化关系表现为细粒含量越多,阻尼比越小,阻尼比与剪应变的关系可表示成G/Gmax的函数,用含G/Gmax的二次多项式能较好地描述D与G/Gmax之间的关系。更多还原

【Abstract】 Dynamic shear modulus G and damping ratio D are the two main parameters for describing the dynamic characteristics of soil.Some dynamic parameters tests on the unsaturated loess with different fine contents were performed by using GDS resonant column system.The test results show that the relation of G,G/Gmaxand the dynamic shear strain γ can be well fitted by Hardin-Drnevich hyperbolic model; the dynamic shear modulus decreases with the increase of fine particle content when other conditions remain constant.The damping ratio D decreases with the increment of fine content,and the relation between D and γcan be represented by a function of G/Gmax,while the relation of D and G/Gmaxcan also be expressed by a quadratic polynomial of G/Gmax.更多还原