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基于三维动力弹塑性有限元分析方法,对冲击压路机沿面板纵向中线及板边两种行驶路线,冲击碾压破碎旧水泥混凝土板时路面板在不同冲击遍数下的变形、受力及破坏特征等力学响应进行了分析。研究发现板边线路板竖向变形明显大于沿板中线路。随着冲击遍数增加路面板呈整体下沉的趋势,最大竖向位移逐渐增大,渐趋稳定;板底冲击轮作用点下方为拉应力区,周围边界局部存在受压区域,纵向相应主拉应力小于横向主拉应力;各工况下路面板表面未出现明显的塑性区,路面板底面均有不同程度的塑性破坏。板边线路最大塑性应变值较板中线路大,但板底的塑性区明显小于板中线路。冲击破碎时,最原始的塑性区首先出现在板底,随着冲击破碎遍数增加,塑性区在面板底部塑性区的基础上逐渐向板面向外发展。
Based on the three-dimensional dynamic elasto-plastic finite element analysis method, the deformation, stress and failure characteristics of the road pavement slab at different impact passes by impact crusher along the longitudinal midline of the panel and the edge of the slab along the impact crushing and crushing old cement concrete slab The mechanical response was analyzed. The study found that the board edge board vertical deformation is significantly greater than the board along the line. As the number of impact passes increases, the pavement slab tends to sink as a whole, and the maximum vertical displacement gradually increases and stabilizes. Under the impact point of the bottom impact wheel, there is a tensile stress zone, and the surrounding boundary has a local compression zone. The tensile stress is less than the transverse principal tensile stress. There is no obvious plastic zone on the surface of road pavement under all working conditions. The bottom of road pavement has different degree of plastic damage. The maximum plastic strain at the edge of the plate is larger than that in the plate, but the plastic zone at the bottom of the plate is obviously smaller than the plate in the plate. The impact of crushing, the most primitive plastic zone first appeared in the bottom of the plate, with the impact of crushing the number increased, the plastic zone at the bottom of the plastic zone at the bottom of the board gradually developed to the outside.