双层水泥混凝土路面结构临界点位置分析

Analysis of Critical Locations in Double-layered Cement Concrete Pavement Structure

摘要:

针对我国水泥混凝土路面刚性、半刚性材料作为基层大量使用的情况，基于弹性地基上不等平面尺寸双层结构模型，采用3维20节点实体单元，讨论了轴载作用下水泥混凝土路面结构（面层和基层）最大荷载应力点的位置、大小和对应的荷位，多轴荷载对最大荷载应力位置和大小的影响，以及移动轴载作用下的最大荷载应力影响线；分析了轴载作用于不同荷位时基层有无超宽对面层、基层自身最大荷载应力的影响，以及轴载向面层内侧移动时路面结构最大荷载应力的变化规律；讨论了温度翘曲和荷载作用的耦合效应。研究结果可用于确定水泥混凝土路面结构临界点的位置。

Abstract:

Since the rigid and semi-rigid materials being commonly employed to be as base in cement concrete highways construction in China, based upon a model of double-layered structure with unequal planar dimensions resting on an elastic foundation, by using the finite element method, the maximum loading stress locations and magnitudes, corresponding axle load positions and the effect of multi-axle loads are thoroughly discussed, the influence lines of the maximum stresses under moving axle loads are also analyzed; while axle loads acting on different pavement positions (including offset of axle loads) the loading stresses in pavement structure with/without base extension are discussed; furthermore, the coupling effect of temperature curling and axle loads action jointly is also studied, However, the results can provide a sound basis for determining the critical locations in cement concrete pavement structure.