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为准确分析冲压荷载作用下旧水泥混凝土路面的变形和应力分布状况,通过建立合适的有限元模型来对其分析计算,并以第一强度理论来判断旧路面板的破裂情况,总结了路面板在冲击压实情况下的破坏机理。通过该模型得出旧水泥路面板竖直方向和水平方向的变形和受力特点,即:路面板在冲压荷载作用下发生纵、横双向弯曲变形,并以全断面的纵向弯曲变形为主,最大变形值位于路面板的两冲压轮之间的位置,路面板断面上竖向各点的沉降变形有微小变化,变形性态说明路面板将以弯曲形式发生破坏;路面板在轮压荷载作用下,上面层受压应力,下面层受拉应力,拉压应力的分界点在路面板中心偏下的位置,上面层绝大部分区域3个方向均处于受压状态,纵向压应力几乎为横向压应力的2倍。
In order to accurately analyze the deformation and stress distribution of the old cement concrete pavement under the action of punching load, the finite element model was used to analyze and calculate the deformation and stress distribution of the old cement concrete pavement. The rupture of the old pavement slab was judged by the first strength theory. Damage mechanism in the event of impact compaction. Through the model, the vertical and horizontal deformation and stress characteristics of the old concrete pavement slab are obtained. That is, the pavement slab is subjected to vertical and horizontal biaxial bending deformation under the punching load, The maximum deformation value is located between two punching wheels of road pavement plate. There is a slight change in settlement at each point in vertical section of pavement plate. The deformation state indicates that the pavement slab will be bent in a curved form. Under the upper layer of compressive stress, the lower layer by the tensile stress, tension and compression stress of the demarcation point in the pavement slab center position, most of the upper strata in all three directions are in compression, the longitudinal compressive stress is almost horizontal 2 times the compressive stress