废弃橡胶轮胎颗粒混合土路用性能研究
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摘要
以废弃橡胶轮胎颗粒作为改良材料,进行室内膨胀土改良试验,分析在不同橡胶颗粒掺入量下混合土的力学性能.结果表明,随着掺胶率的上升,液限和塑性指数先增大后减小,塑限基本保持不变;橡胶混合土的击实曲线较素土平缓,可以在保证压实度的基础上放宽含水率的限制,且最优含水率和素土基本相同;根据无侧限抗压强度试验和直剪试验结果,橡胶颗粒的最佳掺量为20%;橡胶作为路基填料时,其最佳掺量不应超过15%;通过扫描电镜试验,随着橡胶颗粒含量增加,橡胶颗粒和土的黏结程度逐渐加强,在15%至20%之间黏结程度最好.
Waste rubber tire particles are taken as soil amendment materials to conduct a laboratory experiment on swelling soil improvement, aimed at studying mechanical properties of composite soil under different rubber particle contents. The results indicate that the liquid limit and plasticity index increase before decreasing, the plastic limit remains nealry unchanged, as the rubber mixing rate increases; the compaction curve of rubber composite soil is flatter than that of plain soil to extend the limit of soil moisture content based on the compaction being guaranteed, with its optimum moisture content basically identical with that of plain soil; according to the unconfined compressive strength test and direct shear test results, the optimum mixing percentage of rubber particles shall be 20%; the optimum mixing percentage of rubber particles shall be no more than 15%, when rubber is used as roadbed filling. SEM experiments show that the increase of rubber particle content will lead to gradually strengthened adhesion between rubber particles and soil, and the rubber particle content between 15% —20% can bring the optimum adhesion.
Waste rubber tire particles are taken as soil amendment materials to conduct a laboratory experiment on swelling soil improvement, aimed at studying mechanical properties of composite soil under different rubber particle contents. The results indicate that the liquid limit and plasticity index increase before decreasing, the plastic limit remains nealry unchanged, as the rubber mixing rate increases; the compaction curve of rubber composite soil is flatter than that of plain soil to extend the limit of soil moisture content based on the compaction being guaranteed, with its optimum moisture content basically identical with that of plain soil; according to the unconfined compressive strength test and direct shear test results, the optimum mixing percentage of rubber particles shall be 20%; the optimum mixing percentage of rubber particles shall be no more than 15%, when rubber is used as roadbed filling. SEM experiments show that the increase of rubber particle content will lead to gradually strengthened adhesion between rubber particles and soil, and the rubber particle content between 15% —20% can bring the optimum adhesion.
引文
[1]孔德森,贾腾,王晓敏,等.废弃轮胎橡胶颗粒混合土无侧限抗压强度试验研究[J].中南大学学报(自然科学版),2016(1):225-231.
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[3]邹维列,谢鹏,马其天,等.废弃轮胎橡胶颗粒改性膨胀土的试验研究[J].四川大学学报(工程科学版),2011,43(3):44-48.
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[2]辛凌,刘汉龙,沈扬.废弃轮胎橡胶颗粒轻质混合土基本特性试验研究[J].岩土工程学报,2010(3):428-433.
[3]邹维列,谢鹏,马其天,等.废弃轮胎橡胶颗粒改性膨胀土的试验研究[J].四川大学学报(工程科学版),2011,43(3):44-48.
[4]李进.膨胀土改良的室内试验研究及地基胀缩变形分析[D].南京:河海大学,2006.
[5]宋新江.击实试验中压实性指标的精确计算法[J].治淮,2001(7):24-25.
[6]闻生.华电长沙电厂铁路膨胀土路堤石灰改良的试验研究[D].长沙:中南大学,2007.
[7]陶文平.南方红黏土公路路基设计与修筑技术研究[D].长沙:长沙理工大学,2011.
[8]魏让鹏.水泥改性膨胀土击实试验研究[J].西北水电,2015(2):92-94.
[9]秦朝辉.云桂铁路膨胀土膨胀特性与强度特性现场试验研究[D].长沙:中南大学,2013.
[10]中华人民共和国机械工业部.JBT 6842—1993扫描电子显微镜试验方法[S].北京:机械工业出版社,1993.
[11]中华人民共和国水利部.SL237—1999土工试验规程[S].北京:中国水利水电出版社,1999.
[12]中华人民共和国交通部.JTG E40—2007公路土工试验规程[S].北京:人民交通出版社,2007.