湘南地区红黏土动态回弹模量试验与预估模型研究

发布时间：2018-05-01 06:02

本文选题：红黏土 + 动态回弹模量　；参考：《岩土力学》2015年07期

【摘要】：湘南地区广泛分布红黏土,它具有天然含水率高、孔隙比大及结构性强等特点,可用于特殊路基填料。为获得红黏土的动态回弹性能,利用动三轴试验研究了偏应力、围压应力和体应力对红黏土动态回弹模量的影响。结果表明:动态回弹模量随围压和压实度的提高而增大,随偏应力的增大而减小;动态回弹模量受含水率影响较大,并在最佳含水率附近达到最大值。基于试验揭示的动态回弹模量与应力的相关性,采用3种应力相关的典型动态回弹模量预估模型对试验数据进行回归分析,进而遴选出最佳预估模型。误差分析表明,对于湘南地区红黏土,考虑偏应力和围压应力的回弹模量预估模型具有更高的决定系数,能更好地拟合红黏土的动态回弹模量。动态回弹模量试验结果和遴选的预估模型将为湘南地区红黏土路基设计提供试验和理论依据。
[Abstract]:Red clay is widely distributed in southern Hunan. It has the characteristics of high natural moisture content, high porosity ratio and strong structure. It can be used for special subgrade fillers. In order to obtain the dynamic springback properties of red clay, the dynamic triaxial test was used to study the effects of stress, confining stress and bulk stress on the dynamic elastic modulus of red clay. The results show that the dynamic modulus of springback increases with the increase of confining pressure and compaction degree, and decreases with the increase of deflection stress, and the dynamic modulus of springback is greatly affected by moisture content, and reaches the maximum value near the optimum moisture content. Based on the correlation between dynamic elastic modulus and stress, three typical dynamic elastic modulus prediction models are used to analyze the experimental data, and then the best prediction model is selected. The error analysis shows that for red clay in southern Hunan, the prediction model of elastic modulus considering deflection stress and confining pressure stress has a higher determining coefficient and can better fit the dynamic elastic modulus of red clay. The dynamic elastic modulus test results and the selected prediction model will provide experimental and theoretical basis for the design of red clay subgrade in southern Hunan.
【作者单位】：湖南省交通科学研究院;中南林业科技大学土木工程与力学学院;武汉大学土木建筑工程学院;
【基金】：交通部西部交通建设科技资助项目(No.2011 318 785 760) 湖南省交通科技项目(No.201112);湖南省交通科技项目(No.201310)
【分类号】：TU446

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