关键词: 水泥砼路面, 砼面板, 水压力, 板底裂纹, 劈裂

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

Key words: cement concrete pavement, concrete slab, water pressure, crack on the bottom of slab, split