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以某工程场地黏土为研究对象,结合工程实际,考虑不同固结围压对黏土动力特性的影响。通过循环振动三轴试验,对黏土在选定的5组固结围压状态下表现出来的动力特性进行研究,得出固结围压的变化对其产生的影响。在研究的固结围压范围内,固结围压对黏土最大动剪模量的影响显著,随围压的增大呈幂指数增长;对动剪模量比曲线与阻尼比曲线的影响均较小,简化起见,将其分别作归一化处理。数据处理过程中引入Darendeli M B等的研究成果,对试验成果进行统计回归分析,得到Gd/Gdmax-γd关系曲线的归一化表达式,间接得到了λd-γd归一化表达式。
Taking a project site clay as the research object and combining with engineering practice, the influence of different consolidation confining pressure on the dynamic characteristics of clay is considered. Through the cyclic vibration triaxial test, the dynamic characteristics of clay under the condition of the selected five groups of consolidation confining pressure are studied, and the influence of the consolidation confining pressure on it is obtained. In the range of confining confining pressure studied, the effect of confining confining pressure on the maximum dynamic shear modulus of clay is significant, and increases exponentially with the increase of confining pressure. Both of the influence on dynamic shear modulus ratio curve and damping ratio curve Smaller, simplified, respectively, for normalization. In the process of data processing, the research results of Darendeli M B and so on were introduced, and the regression analysis of the experimental results was carried out. The normalized expression of the Gd / Gdmax-γd curve was obtained and the normalized expression of λd-γd was obtained indirectly.