干湿效应作用下改良红粘土路基长期性能试验研究

发布时间：2018-12-26 10:34

【摘要】：为了研究改良红粘土路基的长期性能,对素红粘土、机制砂改良红粘土(掺砂比40%)、生石灰改良红粘土(掺灰比4%)3种情况分别进行了0、1、3、5次干湿循环试验研究,得到了试样CBR值与干湿循环次数的关系。试验结果表明,素红粘土的长期性能对环境中的湿度变化十分敏感,随着干湿循环次数增加,素红粘土试样CBR值呈现逐渐衰减趋势,5个干湿循环周期后,CBR衰减幅度达到40%;机制砂对红粘土的长期性能略有改善,但机制砂改良红粘土对环境中的湿度变化仍然比较敏感,5个干湿循环周期后,CBR值衰减幅度约为20%;生石灰对红粘土的长期性能稳定改善效果显著,生石灰改良红粘土对环境中的湿度变化不敏感,随着干湿循环次数增加,生石灰改良红粘土试样CBR值呈现不降反升的趋势,5个干湿循环周期后CBR上升幅度高达78%。
[Abstract]:In order to study the long-term performance of the improved red clay roadbed, the dry and wet cycle tests were carried out for five times, namely, plain red clay, modified red clay with machine-made sand (40% mixed with sand) and improved red clay with quicklime (4% mixed with lime), respectively. The relationship between the CBR value of the sample and the number of dry and wet cycles was obtained. The results show that the long-term performance of pristine red clay is very sensitive to the change of humidity in the environment. With the increase of dry and wet cycles, the CBR value of plain red clay samples decreases gradually, and after 5 cycles of dry and wet cycles, The attenuation amplitude of CBR reached 40. The long-term performance of the modified red clay is slightly improved, but the modified red clay is still sensitive to the humidity change in the environment. After five dry-wet cycles, the CBR attenuation range is about 20. The effect of quicklime on the long-term stability of red clay is remarkable, and the modified red clay is insensitive to the change of humidity in the environment. With the increase of dry and wet cycles, the CBR value of quicklime modified red clay shows a trend of increasing instead of decreasing. After five dry and wet cycle, the CBR increased to 78%.
【作者单位】：云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室;
【基金】：基金项目云交科2015(A)12
【分类号】：U416.16

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