| 考虑动本构关系相似的模型土设计及相似判定体系研究 |
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| 引用本文： | 王志佳,张建经,闫孔明,吴金标,邓小宁.考虑动本构关系相似的模型土设计及相似判定体系研究[J].岩土力学,2015,36(5):1328-1332. |
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| 作者姓名： | 王志佳 张建经 闫孔明 吴金标 邓小宁 |
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| 作者单位： | 1. 西南交通大学土木工程学院,四川成都,610031
2. 郑州中核岩土工程有限公司,河南郑州,450002 |
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| 基金项目： | 国防基础科研计划（No. B0220133003）。 |
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| 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。
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| 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 |
| 收稿时间： | 2014-08-29 |
Model soil design considering similitude of dynamic constitutive model and evaluation of similarity level |
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| WANG Zhi-jia
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ZHANG Jian-jing
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YAN Kong-ming
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WU Jin-biao
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DENG Xiao-ning.Model soil design considering similitude of dynamic constitutive model and evaluation of similarity level[J].Rock and Soil Mechanics,2015,36(5):1328-1332. |
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| Authors: | WANG Zhi-jia ZHANG Jian-jing YAN Kong-ming WU Jin-biao DENG Xiao-ning |
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| Institution: | 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. China Nuclear Industry Geotechnical Engineering Co., Ltd., Zhengzhou, Henan 450002, China |
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| 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 and shear stain with reference strain as controlling factors. Several dynamic triaxial tests are carried out to obtain the - and reference strain of model soil, and the data are compared with those of prototype soil. Then a juding system based on the degree of similarity of - 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. |
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| Keywords: | soil-structure interaction shaking table test model soil scale model design reference strain evaluation of similarity level |
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