粘粒级配对黄土动力特性影响的微观机理分析

Microscopic Mechanism Analysis of the Influence of Clay Particle Size Distribution on the Dynamic Characteristics of Loess

本文采用室内固结不排水动三轴试验,研究粘粒对黄土动力特性的影响机理和变化规律。通过试验发现:当黄土中的粘粒含量低于临界值时,随着粘粒含量的增加,粉粒逐渐被粘粒分隔开来,从而造成接触点的降低,致使动剪切模量下降,阻尼比增加;当黄土中粘粒含量超过临界值时,黄土中的粘粒间隙随粘粒含量的增加而逐渐减少,在阻尼比降低的同时,造成动剪切模量的增加。

This article adopts indoor consolidated undrained dynamic triaxial tests to study the influence mechanism and variation law of clay particles on the dynamic characteristics of loess.Through experiments,it was found that when the clay content in loess is below the critical value,as the clay content increases,the powder particles are gradually separated by the clay particles,causing a decrease in the contact point,resulting in a decrease in the dynamic shear modulus and an increase in the damping ratio;when the clay content in loess exceeds the critical value,the clay gap in loess gradually decreases with the increase of clay content,causing an increase in dynamic shear modulus while the damping ratio decreases.