干湿循环下改良红黏土填料回弹模量变化分析

Analysis of Resilient Modulus of Improved Red Clay Filler during Dry-wet Cycle

针对机制砂与生石灰两种改良红黏土,开展了不同掺量及不同干湿循环次数下改良红黏土填料的回弹模量试验。结果得出:改良红黏土的回弹模量随生石灰和机制砂掺量的增加均呈线性递增关系,生石灰改良红黏土回弹模量的增长速率明显大于机制砂改良红黏土;随着干湿循环次数增加,素红黏土和机制砂改良红黏土的回弹模量值呈对数函数衰减,而生石灰改良红黏土的回弹模量则呈现不降反升的趋势,表明机制砂对红黏土填料长期水稳定性的改善效果不明显,生石灰的改良作用显著。

For machine-made sand and lime improved red clay filler, the resilient modulus test is made at different mixing ratio and during different dry-wet cycles. It is found that the resilient modulus of improved red clay were linear linearly increases with the increase in the mixing ratio of machine-made sand and lime, the resilient modulus of lime improved red clay filler has much higher growth rate than the machine-made sand improved red clay filler. With the increase of dry-wet cycles, the resilient modulus of the red clay and the machine-made sand improved soil is decreased with logarithmic function, and the resilient modulus of the lime improved red clay is not decreased but increased. Therefore, the machine-made sand improved red clay filler does not have obvious the improvement effect on the long-term water stability, and the lime had a significant improvement effect on the long-term stability of the red clay filler.