考虑动本构关系相似的模型土设计及相似判定体系研究

发布时间：2018-02-23 01:09

本文关键词： 土-结构相互作用振动台试验模型土相似设计参考应变相似判定　出处：《岩土力学》2015年05期 　论文类型：期刊论文

【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。
[Abstract]:The design of model soil is an important part of soil-structure interaction shaking table test. The design method of model soil for shaking table test is introduced briefly. Based on the backbone curve equation of the dynamic stress-strain relationship of soil mass, the indexes controlling the similarity between the dynamic characteristics of the prototype soil and the model soil are derived, and the shear modulus ratio (maxG/G) of the soil is proposed. Relation curve and reference strain r? The similarity ratio of the model soil is used as the controlling factor in the design of the model soil. The maxG / G ~ (- (-)) of the model soil is obtained by the dynamic triaxial test of the model soil. Relationship curve and r? Value for model soil and prototype soil maxG / G? Relationship and r? It is suggested that the curve correlation coefficient, curve inhomogeneity coefficient and curvature coefficient of the curve be taken as maxG / G? The conclusion of the study is significant for the design of model soil in shaking table test.
【作者单位】：西南交通大学土木工程学院;郑州中核岩土工程有限公司;
【基金】：国防基础科研计划(No.B0220133003)
【分类号】：TU411

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