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为了建立沥青混合料强度与疲劳行为之间的联系,通过不同加载速率下的沥青混合料直接拉伸强度试验,揭示了强度随加载速率的幂函数变化规律;基于不同加载速率下的强度值,得到了与疲劳加载速率对应的沥青混合料疲劳真实应力比;通过疲劳试验,创建了基于名义应力比和真实应力比的沥青混合料疲劳方程,基于名义应力比的疲劳方程后延后与横坐标的交点远比1大,不具有后延性,而基于真实应力比的疲劳方程可以后延到疲劳寿命为1的强度破坏点,统一了强度破坏与疲劳破坏行为;据此推导了沥青路面抗拉强度结构系数计算新方法;研究结果可为我国公路沥青路面设计规范的修订提供理论依据。
In order to establish the relationship between asphalt mixture strength and fatigue behavior, the direct tensile strength test of asphalt mixture under different loading rates reveals the variation law of the power as a function of the loading rate. Based on the strength values under different loading rates, The fatigue true stress ratio of asphalt mixture corresponding to the fatigue loading rate was obtained. Through the fatigue test, the fatigue equation of asphalt mixture based on the nominal stress ratio and the true stress ratio was established. The fatigue equation based on the nominal stress ratio was postponed and abscissa Is larger than 1 and does not have ductility. However, the fatigue equation based on the true stress ratio can be postponed to the strength failure point with fatigue life 1 and the strength failure and fatigue failure behaviors are unified. Based on this, the tensile resistance of asphalt pavement The new method of calculating the strength coefficient of structure is provided. The research results can provide a theoretical basis for the revision of the design specifications of highway asphalt pavement in our country.