摘要
为深入研究水泥稳定碎石疲劳特性,对比了垂直振动法和静压法成型的试件与路面芯样的相关性,采用更符合水泥稳定碎石实际力学性能的垂直振动法成型圆柱体试件,研究其劈裂疲劳特性,分析材料组成对疲劳特性的影响,应用Weibull分布建立水泥稳定碎石疲劳方程,构建抗拉强度结构系数,并与规范推荐系数进行了对比。研究结果表明：水泥剂量较低时骨架密实级配水泥稳定碎石疲劳性能优于悬浮密实级配,水泥剂量增大,级配对疲劳性能的影响变小;水泥剂量对疲劳性能的影响较显著,一定范围内水泥剂量越高抗疲劳性能越好;水泥稳定碎石在50%失效概率下疲劳方程回归系数a的取值范围为1.103 5~1.134 5,b的取值范围为0.041 3~0.045 4;构建的抗拉强度结构系数能够较好地指导路面设计。
In order to study the fatigue performance of cement stabilized macadam thoroughly, the correlation of pavement samples and specimens shaped with vertical vibration test method and static pressure method was studied. Cylinder specimens shaped with vertical vibrating test meth- od which is more in line with the actual mechanical properties of cement stabilized macadam were used to study the splitting fatigue performance. The influence of materials composition on fatigue performance was analyzed. The fatigue equations were established by the Weibull distribution and the tensile strength structure coefficient was studied. The comparison of the tensile strength structure coefficient given in this article and the coefficient given in specification was carried out. The results show that when the cement dosage is low, the fatigue performance of skeleton dense gradation cement stabilized macadam is better than that of suspension dense gradation. With the cement dosage increasing, the effect of gradation on fatigue performance becomes smaller. Cement dosage has much effect on fatigue performance. In certain range, fatigue performance gets better with the cement dosage increasing. Under 50% failure probability, the range of regression coefficient a of fatigue equation is 1.103 5-1. 134 5 and the range of regression coefficient b is 0. 041 3-0. 045 4. The tensile strength structure coefficient built by this article can guide the pavement design better. 8 tabs, 2 figs, 17 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第4期1-6,共6页
Journal of Chang’an University(Natural Science Edition)
基金
新世纪优秀人才支持计划项目(NCET-08-0749)
交通行业联合科技攻关项目(2008 353 313 010
2008 353 333 200)
关键词
道路工程
水泥稳定碎石
疲劳特性
垂直振动试验方法
劈裂疲劳试验
抗拉强度结构系数
road engineering
cement stabilized macadam
fatigue performance
vertical vibration test method
splitting fatigue test
tensile strength structure coefficient
