水压力对砼面板板底裂纹的劈裂作用和数值模拟

水泥砼路面在荷载、温度等的作用下,板底会出现缺陷、裂纹,随着填缝料的失效,水在板底积聚,在行车荷载的作用下,板底水压力会达到一个相当大的程度.对于板底裂纹而言,水的作用相当于在裂纹面上施加了促使裂纹扩展的均布劈裂力,运用断裂力学原理揭示了水对裂纹的劈裂作用,同时采用平面有限元从应力角度考察了水压对裂纹的劈裂影响.对于水泥砼路面板的断裂分析具有一定的理论意义.

Fracture Mechanism and Simulation of Cracks on the Bottom of Concrete Slab under Water Pressure Effect

With the action of traffic load and temperature,defects and cracks emerge on the bottom of the concrete pavement slabs.Accompanied with the failure of the stuffing,water may be accumulated under the slabs,and because of the high speed traffic load,the water pressure will reach to a large extent.To the cracks on the bottom of the slabs,the effect of water is just like the uniform forces assigned on the crack face which lead to the cracks to split.With fracture mechanics,the principles of the split effect of water was disclosed;meanwhile,from the view point of stress,the split effect of water pressure through plane finite element method was evaluated.The conclusion is useful and helpful to analyze the fracture of concrete slab.