压实黄土动态回弹模量的试验研究

Laboratory research of dynamic resilient modulus of compacted loess

通过室内重复加载三轴试验,研究了影响压实黄土动态回弹模量的主要因素及其规律.研究结果表明:回弹模量随围压和压实度的提高而增大,随偏应力和含水量的增大而减小,且在含水量和压实度一定时,回弹模量存在着一定的应力依赖关系.在此分析基础上,采用3参数复合模型,以体应力和剪应力为变量,回归得出压实黄土在不同含水率和压实度下的回弹模量预估模型,并将模型参数与土样物性参数之间建立了线性回归模型,拓宽本研究成果的应用范围.

A series of repeated loaded triaxial tests were conducted to investigate the fac- tors which affect compacted loess dynamic resilient modulus and their laws. The results demonstrate that MR values rise with the increase of confining stress and compaction de- gree,in reverse of circular deviator stress and moisture content. When the moisture con- tent and compaction degree are fixed, the resilient modulus exist stress-dependent char- acteristics to some extent. Based on these analysis,a three parameters＇s composite model which involves bulk stress and shear stress was used to fit the experiment results. The prediction model used for different moisture for compacted loess,and established a linear ters＇s composite model parameters and soil scope of application. content and compaction degree was achieved regressive model between the three parame- physical parameters to broaden the research