In order to improve the anti-cracking performance of asphalt stabilized macadam,the gradation of asphalt stabilized macadam was optimally designed with coarse aggregate gapped and semi-opened gradation(ATB-25).Double sides shear fatigue tests under different stress ratio,namely 0.1,0.2,0.3,0.4,0.5 were carried out on ATB-25 beam samples.It is found that the stress ratio has a significant effect on the fatigue life,and the fatigue life under different stress ratios are all subject to the double parameter Weibull distribution,and the p-S-N type shear fatigue equations with different failure probability are established.%为提高沥青稳定碎石的抗裂性能,优化设计了粗集料间断半开级配的沥青稳定碎石(ATB-25),并对其进行了应力比分别为0.1,0.2,0.3,0.4和0.5的双面剪切疲劳试验.结果表明:应力比对ATB-25梁式试件疲劳寿命具有显著影响;各应力比下其疲劳寿命均服从双参数Weibull分布.同时建立了不同失效概率下的概率型(p-S-N型)剪切疲劳方程.
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