水基-聚合物SRX稳定碎石疲劳试验研究

Fatigue Test of Water-Polymer SRX Stabilized Crushed Stone

基于垂直振动成型试验方法,采用Weibull分布函数,研究了不同SRX含量以及不同应力水平下SRX稳定碎石的疲劳寿命,试验结果表明:应力水平和SRX含量直接影响SRX稳定碎石的疲劳寿命,随着应力水平的提高和SRX含量的减少,SRX稳定碎石的疲劳寿命逐渐减小,特别是当应力水平大于0.85,达到0.9时,SRX稳定碎石的疲劳寿命急剧下降。通过分析SRX稳定碎石的等效疲劳寿命的概率分布,得出了其符合两参数Weibull分布的结论,并给出了SRX稳定碎石在不同SRX含量下以及不同失效概率下的疲劳寿命方程。通过对比分析SRX稳定碎石、水泥稳定碎石与ATB—30失效概率为50%时的疲劳方程曲线,表明SRX稳定碎石的疲劳性能明显优于水泥稳定碎石,与ATB—30的疲劳性能相近。

Based on vertical vibration test method,the fatigue lives of water-polymer SRX stabilized crushed stone under different SRX contents and stress levels were studied by using Weibull distribution.These test results show that stress level and SRX content have direct impact on the fatigue life of SRX stabilized crushed stone,and it decreases with the increase of the stress level and the decrease of the SRX content.When the stress level is bigger than 0.85,especially achieving 0.9,the fatigue life of SRX stabilized crushed stone decreases rapidly.It is proved that its equivalent fatigue life obeys two-parameter Weibull distribution through analyzing its probability distribution.The fatigue equations were formulated under different SRX contents and different failure probabilities.The fatigue property of SRX stabilized crushed stone is significantly better than that of cement stabilized crushed stone,and closes to that of ATB—30,by comparing its fatigue equation with those of cement stabilized crushed stone and ATB—30.