铜川新区黄土与古土壤动剪切模量比和阻尼比的统计研究

Statistical study on dynamic shear modulus ratio and damping ratio of loess and paleosols in Tongchuan New District

利用铜川市地震小区划项目的大量典型土样动三轴试验结果,采用双曲线模型拟合得到了铜川新区黄土和古土壤在8个典型应变下的动剪切模量比和阻尼比值。根据不同沉积年代和不同土层深度2种方法对黄土、古土壤动剪切模量比和阻尼比随剪应变变化情况进行了统计和对比分析。研究发现:同一剪应变下,黄土、古土壤动剪切模量比随沉积年代和土层深度的增加而增加。二者对黄土动剪切模量比的影响较为显著。

Using a large number of typical dynamic triaxial test results of soil samples from the project of Tongchuan Seismic Microzoning,the dynamic shear modulus ratio and damping ratio of loess and paleosols in Tongchuan New District under 8 typical strains were obtained by the hyperbolic model fitting.The variations of dynamic shear modulus ratio and damping ratio with shear strain of loess and paleosols were analyzed and compared according to different deposition ages and different depths.It is found that the dynamic shear modulus ratios of loess and paleosols increase with the increase of the deposition age and soil depth under the same shear strain.The influence of the two factors on the dynamic shear modulus ratio of loess is significant.