振动频率与龄期对河道淤泥气泡混合轻质土动力特性影响及机理

利用室内动三轴实验研究了振动频率与龄期对河道淤泥气泡混合轻质土（FMLSS）动力特性的影响。结果表明，振动频率和龄期对FMLSS的动力特性有明显影响。振动频率越小，轴向动应变和阻尼比越大，动模量越小。随着养护龄期的增长，动模量增大而阻尼比减小。动模量曲线在振动频率大、养护龄期长和水泥含量高时更加陡峭。当动应变较小时，不同龄期的FMLSS阻尼比很接近，随着动应变不断发展，阻尼比差异增大。FMLSS的动模量曲线都呈平缓衰减型，阻尼比在0.01~0.03之间，体现出FMLSS是良好的弹性材料。最后，探讨了振动频率和龄期对FMLSS动力特性的影响机理。

Effects of cyclic loading frequency and curing age on dynamic characteristics and mechanism of FMLSS

Effects of cyclic loading frequency and curing age on the dynamic characteristics of foamed mixture lightweight soil of sludge (FMLSS) were studied using triaxial apparatus. Test results showed that the cyclic loading frequency and curing age have obvious effects on the FMLSS, the lower the cyclic loading frequency, the greater the axial strain and the damping ratio and the lower the dynamic modulus. With an increase in curing age, the dynamic modulus increases and the damping ratio decreases. The dynamic modulus curves are steeper under high cyclic loading frequency, long curing age, and high cement content. When the dynamic strain is small, the damping ratio of FMLSS under different curing ages is close, and the difference in the damping ratio increases with the increase in the dynamic strain. The relationship curves of the dynamic modulus show the attenuation type and are relatively flat, and the damping ratio is about 0.01 to 0.03, which suggests that FMLSS is a very elastic material. Finally, the influence mechanism of cyclic loading frequency and curing age on the dynamic characteristics of FMLSS were discussed.