杨凌揉谷黄土动强度变化规律研究

Research on the law of loess dynamic strength variation at Rougu of Yangling

以杨凌揉谷原状和重塑黄土为研究对象,进行不同含水率、干密度和固结围压下的动强度试验,探究单向激振下土样动强度随振次变化规律,对比原状和重塑土样动强度值差异,为西部地区工程建设抗震设计提供一定参考。结果表明:随着干密度的增加、含水率的降低、固结围压的增加,相同破坏振次下的土样动强度值增大,原状土样和重塑土样的动强度值差异随固结围压的增大而增大,随含水率增大稍有减少。

Aimed at the loess of Yangling Rougu,the paper used the SDT-20 dynamic triaxial apparatus to research the dynamic strength variation by change moisture content,dry density and consolidation confining pressure of original and reconstituted samples,at the same time contrasted dynamic strength differences between original and reconstituted loess,so as to provide a basis for anti-seismic design in western China.The results show that,with the increase of dry density,moisture content is reduced and the confining pressure of consolidation increases,the same destruction vibration time of the soil sample,dynamic strength increases,the difference of dynamic strength value between original soil samples and reconstituted ones increases with the confining pressure of consolidation enhances and slightly reduce with the increase of moisture content.