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研究表明,水泥混凝土路面在凝固收缩过程中形成板底早期裂缝,产生缺陷。为此,采用了断裂力学的基本原理,通过计算得出路面板底裂缝深度、荷载大小和应力强度因子之间的关系,分析了路面裂缝扩展的条件。同时,利用疲劳方程建立了荷载作用次数与稳定断裂韧度下降之间的关系式,由此说明疲劳荷载作用下产生的累计损伤导致的稳定断裂韧度下降是路面开裂破坏的根本原因。
The research shows that cement concrete pavement forms early plate cracks and causes defects during solidification and shrinkage. Therefore, the basic principle of fracture mechanics is adopted. The relationship between depth of crack at the bottom of road pavement, load size and stress intensity factor is calculated and the condition of pavement crack propagation is analyzed. At the same time, the relationship between the number of loadings and the decrease of the stable fracture toughness was established by using the fatigue equation, which shows that the decrease of the stable fracture toughness caused by the cumulative damage caused by the fatigue load is the root cause of the road surface cracking.