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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 further study the fatigue characteristics of cement stabilized macadam, the correlation between vertical vibration method and static pressure method was compared with that of pavement core samples. The vertical vibration method was used to form cylindrical specimens more in line with the actual mechanical properties of cement stabilized macadam , The fracture fatigue characteristics were studied, the effect of material composition on fatigue properties was analyzed, the fatigue equation of cement stabilized gravel was established by Weibull distribution, and the structural coefficient of tensile strength was constructed and compared with the standard recommended coefficient. The results show that the fatigue performance of cement stabilized gravel with dense cement matrix is better than that of suspended solid with lower cement dosage, the dosage of cement increases and the effect of grading on fatigue performance is smaller. The effect of cement dosage on fatigue performance is significant, The higher the cement dosage in a certain range, the better the fatigue resistance. The regression coefficient a of the cement stabilized macadam with 50% probability of failure is in the range of 1.103 5 ~ 1.134 5, b is in the range of 0.041 3 ~ 0.045 4 The structural coefficient of tensile strength can well guide the pavement design.