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为研究大粒径沥青混合料基层的抗裂机理,采用多层弹性理论程序计算了不同结构类型路面内荷载作用产生的应力应变,基于瞬态传热假设建立了平面有限元模型,计算了降温时路面结构内的温度应力和应变,得到了荷载与温度耦合下各结构层的变形和受力特性。研究发现,当考虑车辆荷载和快速降温共同作用时,快速降温所引起的温度应力远大于标准荷载引起的荷载应力,说明快速降温的温度应力对路面的开裂起主要作用。同时,通过两种结构对比,发现采用ATB 30基层结构的沥青混凝土面层的温度和荷载应力应变均小于传统的半刚性基层沥青混凝土路面。因此认为,设置沥青稳定碎石基层是一种减少沥青混凝土路面开裂的有效方法。
In order to study the crack resistance mechanism of large-size asphalt mixture base course, the stress and strain caused by the load in different types of pavement were calculated by the multi-layer elastic theory program. The plane finite element model was established based on the assumption of transient heat transfer. When the temperature stress and strain in pavement structure, the deformation and stress characteristics of each structural layer are obtained under the coupling of load and temperature. The study found that the temperature stress caused by rapid cooling is far greater than the load caused by standard load when considering the interaction between vehicle load and rapid cooling, indicating that the rapid cooling temperature stress plays a major role in cracking the pavement. At the same time, through the comparison of the two structures, it is found that the temperature and load stress and strain of the asphalt concrete pavement using the ATB 30 base structure are less than the traditional semi-rigid base asphalt concrete pavement. Therefore, it is considered that setting asphalt stabilized gravel base is an effective way to reduce the cracking of asphalt concrete pavement.