重载及脱空耦合状态下混凝土路面疲劳寿命分析

Fatigue Life Analysis of Portland Cement Concrete Pavements in Coupling Conditions of Heavy Load and Lost Support

重载及板底脱空是引起水泥混凝土路面早期破坏最主要的2个因素,采用三维有限元方法对水泥混凝土路面在重载及板底脱空耦合状态下的应力及疲劳寿命进行了分析,结果表明,在温度、重载及脱空等几种不利因素的共同影响下,路面板受力状况急剧恶化,路面的使用寿命大大缩短,有时甚至可能产生极限破坏。

Heavy loads and coring under slab are the two main factors to cause earlier period damage of cement concrete pavement. In this paper, stress and fatigue life of cement concrete pavement on the coupling condition of heavy loads and coring are analyzed by 3D finite element method. The analysis indicated that, with the influence of thermal, heavy loads and coring, stresses in slab increase rapidly, service life span of pavement shortens greatly and even cause cement concrete pavement to produce limit breakage.