砂-锯末混合模型土的动力特性试验研究

为研究砂-锯末混合模型土的动力参数规律特性,采用动三轴试验,研究了此类土的滞回圈特性以及其动剪切模量和阻尼比随循环加载次数的变化规律.试验结果表明:分级循环加载过程中,随着荷载级别的增加,滞回圈的面积逐渐增大,形状从柳叶形向新月形发展;模型土的动剪切模量在各循环下基本为常量而阻尼比呈上下波动;而随荷载级别的增大,动剪切...

Experimental Study of Dynamic Characteristics of Modal Soil Mixed with Sand and Sawdust

To investigate the characteristics of dynamic parameters of model soil mixed with sawdust and sand, a series of dynamic triaxial tests were carried out to study the hysteresis loop''s characteristics of this kind of soil, and the variation characteristics of dynamic shear modulus and damping ratio with the number of cyclic loading were also discussed. The test results showed that in the process of cyclic loading, the hysteretic circle showed a gradual increase in area and its shape developed from leaf to crescent as the loading level increased. The dynamic shear modulus of the model soil was basically constant and the damping ratio fluctuated under different cycle. With the increase of load level, the mean value of dynamic shear modulus decreased, and that of damping ratio increased. Lastly, the distribution of dynamic parameter curves of model soil are similar to those of common sandy soil, but the dynamic shear modulus is smaller and the damping ratio is larger.