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为探讨在车辆荷载重复作用下,铺面材料疲劳性能的变化规律,采用含有层间界面的复合小梁进行四点弯曲疲劳试验。通过改变复合小梁的材料组合方式、黏层油类型及用量,以及应变水平等影响因素,测定复合小梁试件的疲劳寿命。结果表明:(1)对于双层均为密实型材料的复合小梁,各因素对其疲劳寿命的影响大小顺序为黏层油用量>应变水平>黏层油类型,对于上层为空隙型、下层为密实型的复合小梁,各因素影响顺序为应变水平>黏层油用量>黏层油类型;(2)随着上层沥青混合料空隙的增大,层间黏结性能下降,复合小梁疲劳寿命减小,而随着黏层油用量的增加,层间黏结性能先增后减,复合小梁的疲劳寿命也先增后减;(3)混合料级配类型及材料性质在影响复合小梁疲劳寿命的因素中居主导地位,SMA-13与SMAP-5的结构组合整体性最好,疲劳寿命最大;(4)确定了复合小梁疲劳寿命与黏层油用量之间的相互关系,并采取现象学法疲劳模型,建立疲劳寿命方程。
In order to investigate the variation of fatigue properties of pavement materials under repeated vehicle loads, a four-point bending fatigue test was conducted using a composite trabecular interface with interlayer interfaces. The fatigue life of the composite trabecular specimens was measured by changing the material combination, the type and amount of viscous layer oil, the strain level and other factors. The results show that: (1) For the double-layer composite beam with compact material, the effect of each factor on the fatigue life is in the order of viscous layer oil> strain level> viscous layer oil type, (2) With the increase of the voids in the upper bitumen mixture, the adhesion between the layers decreased, the fatigue of the composite trabeculae Life expectancy decreased. With the increase of the amount of viscous layer oil, the interfacial adhesion increased first and then decreased, the fatigue life of the composite trabecular first increased later; (3) The fatigue life of the beam dominates. The structural integrity of SMA-13 and SMAP-5 is the best, and the fatigue life is the largest. (4) The relationship between the fatigue life of composite beam and the viscosity of viscous layer oil is determined. Phenomenological fatigue model to establish fatigue life equation.