| 中粗砂改良膨胀土的收缩性试验研究 |
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| 引用本文： | 易志斌.中粗砂改良膨胀土的收缩性试验研究[J].路基工程,2018,0(5):144-148. |
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| 作者姓名： | 易志斌 |
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| 作者单位： | 湖南省益娄高速公路建设开发有限公司, 湖南益阳 413000 |
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| 基金项目： | 湖南省交通科技计划项目（200944） |
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| 摘 要： | 以膨胀土的收缩性指标为研究对象，探讨工程中利用中粗砂作为膨胀土物理改良材料的可行性。通过对膨胀土掺加不同比例的中粗砂开展收缩试验，分析了中粗砂改良膨胀土的线缩率、体缩率、缩限和收缩系数等4个收缩性指标的变化规律。结果表明:随着中粗砂掺量增加，线缩率、体缩率和收缩系数等3个指标呈一元三次函数关系逐渐减小，当中粗砂掺量不大于10%时变化幅度较大，掺量大于10%时变化幅度较小。缩限随中粗砂掺量增加呈一元四次函数关系变化，当中粗砂掺量不大于10%时缩限随中粗砂掺量增加而减小，掺量大于10%时缩限随中粗砂掺量增加而
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| 关 键 词： | 膨胀土 中粗砂 改良 收缩性 |
| 收稿时间： | 2019-11-10 |
Study on Shrinkage Test of Medium-coarse Sand Treated Expansive Soil |
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| Abstract: | This paper studies shrinkage index of the expansive soil to find out the feasibility to improve the expansive soil with medium-coarse sand in engineering. Add medium-coarse sand with different proportions in the expansive soil, and carry out shrinkage test to study the change rules of the linear shrinkage ratio, volume shrinkage ratio, shrinkage limit and shrinkage coefficient, the 4 shrinkage indexes. The result shows that with the increment of medium-coarse sand, the linear shrinkage ratio, volume shrinkage ratio and shrinkage coefficient decreased gradually in one dimensional cubic function. When the increment of medium-coarse sand less than 10%, the change range is bigger, when more than 10%, the change smaller. With the increment of medium-coarse sand, the shrinkage limit changed in one dollar four times function, When the increment of medium-coarse sand not more than 10%, the shrinkage limit decreased with increment, and if more than 10%, the shrinkage limit increased with the increment. The optimum added quantity is 10%~15%. |
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