基于改进遗传算法的公路沥青混凝土路面黏弹性损伤演化模拟

Viscoelastic Damage Evolution Simulation of Highway Asphalt Concrete Pavement based on Improved Genetic Algorithm

沥青混凝土路面在低温状态下会有明显的开裂现象,一旦公路路面上出现裂缝,路面就会逐渐损坏,影响道路的平稳性与舒适性。为降低公路维护成本,基于改进遗传算法对公路沥青混凝土路面黏弹性损伤进行演化模拟。建立沥青混凝土路面结构模型,依据弹性柔量与摩擦系数的关系得到路面各层级之间的空间特征;基于改进遗传算法计算路面黏弹性损伤荷载,划定初始损伤与断裂区域的应力总值,计算路面黏弹性损伤荷载;设定路面损伤在环境温度以及各层级间相对位移量的边界条件,得到路面损伤模拟分析的方法。由试验数据可知:温度越低,路面的应力作用越大,且裂缝的长度与路面正应力成正比。

Asphalt concrete pavement will have obvious cracking under low temperature.Once cracks appear on the highway pavement,the pavement will be gradually damaged,afecting the stability and comnfort of the road.In order to reduce the cost of highway maintenance,the viscoelastic damage of highway asphalt concrete pavement is simulated based on improved genetic algorithm.The structural model of asphalt concrete pavement is established,and the spatial characteristics of each level of pavement are obtained according to the relationship between elastic coupliance and friction coeffcient;based on the improved genetic algorithm,the viscoelastic damage load of pavement is calculated,the total stress of initial damage and fracture area is delimited,and the viscoelastic damage load of pavement is calculated;The boundary conditions of pavement damage at ambient temperature and relative displacement between levels are set,and the method of pavement damage simulation analysis is obtained.According to the experimental data,the lower the temperature is,the greater the stress effect of the pavement is,and the length of the crack is directly proportional to the normal stress of the pavement.