基于有限元计算的水泥路面板底脱空评定指标研究

Study on Void Evaluation Index Beneath Concrete Slabs Based on the Finite Element Method

采用PFWD检测了水泥混凝土路面板不同位置处的实际弯沉值,根据横缝不设传力杆的高速公路水泥混凝土路面板脱空发展的一般规律,确定了板中不脱空对应的弯沉值。通过三维有限元模拟计算,分析了在不同脱空尺寸下不同位置的理论弯沉,得到脱空面积与弯沉值的回归计算式,最终确立了板边、板角脱空的弯沉指标。

The deflections at different positions of a cement concrete slab were detected by utilizing PFWD, and based on the general progression law of the voids beneath the cement concrete slabs without dowel bars, the center deflection of a slab without void was determined. By using the finite element method, the deflections at different positions with different void sizes were systematically analyzed, and the authors established the formulas of the void area and deflection, eventually determined the deflection indexes of the slab corners, and edges, for void evaluation.