【摘要】 模型土的设计是土与结构相互作用(SSI)振动台试验的重要组成部分。对当前振动台试验模型土的设计方法进行简要介绍,分析当前设计方法的不足。基于土体动应力-动应变关系的骨干曲线方程推导出控制原型土与模型土动力特性相似关系的指标,提出利用土体的剪切模量比maxG/G随剪应变?的变化关系曲线和参考应变r?的相似比作为模型土设计的控制因素。开展模型土的动三轴试验,得到了模型土maxG/G-?关系曲线和r?值,对模型土与原型土maxG/G-?关系和r?值相似性进行了比较,并建议将曲线相关系数、曲线不均匀系数和曲线的曲率系数作为原型土和模型土maxG/G-?曲线相似度高低的评价指标。研究结论对于振动台试验中模型土的设计具有指导意义。更多还原

【Abstract】 Model soil design, as a vital component of shaking table test of soil-structure interaction, is introduced briefly. After analyzing drawbacks of existing design methods, the similarity indexes of dynamic characteristic between prototype soil and model soil is derived based on backbone curve equation of dynamic stress-strain of soil. Then, a new approach for model soil design is proposed in which treating the similarity of shear modulus ratio maxG/ G and shear stain ? with reference strainr? as controlling factors. Several dynamic triaxial tests are carried out to obtain the maxG/ G- ? and reference strain r? of model soil, and the data are compared with those of prototype soil. Then a juding system based on the degree of similarity of maxG/ G- ? between prototype soil and model soil is proposed. The evaluation indexes of juding system mainly include correlation coefficient, nonuniformity coefficient and coefficient of curvature. The research conclusions have great guiding significance on the design of model soil, which are particularly important for shaking table test.更多还原