关键词: 道面板尺寸, 温度梯度, 临界荷载, 累积损伤, 疲劳寿命

Abstract: Chinese airports usually use cement concrete road slabs with a slab width of no more than 5 m, and existing airports in other countries use cement concrete slabs with a width more than 6 m. Small size cement concrete pavement slabs are more likely to suffer from disease than large size. In order to study the effect of pavement slab size on pavement performance, a finite element model of pavement structure was established based on the elastic layered theoretical system. By changing the size of the pavement slab, the stress changes of the pavement slab under the combined action of aircraft load and temperature gradient are studied. The internal stress change of the slab is used to analyze the influence of the plane size of the pavement slab on the service life of the pavement slab under the combined action of temperature gradient and aircraft load through an example of real airport. The results show that the internal stress of the pavement slab is greatly affected by the temperature gradient. Under the action of common aircraft load, more than 25% of the internal tensile stress of the pavement slab in summer is caused by the temperature gradient load; under the same load, the damage of different sizes of pavement slabs is different, and choosing the appropriate pavement size can significantly increase the expected service life of the cement concrete pavement.

Key words: pavement slab size, temperature gradient, critical load, cumulative damage, fatigue life