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以解放CA141为代表车型,分析了车辆在驶入爬坡路段后的4种可能行为,根据其动力性能参数计算出上坡时加减速换挡的加速度,据此建立了移动荷载下三维沥青路面瞬态动力学分析有限元模型,对不同行驶工况下路面内的压应力、剪应力及竖向位移特性进行分析。计算结果表明:在移动荷载作用下,路面结构的应力响应不仅具有波动特性,同时在一定区域内呈现交变特性,出现了拉压应力逆转变化,压应力分布主要集中在路表0～6cm范围内;由于速度的降低及水平力的增大,路表处最大剪应力由轮隙向轮心处迁移,沿道路深度方向,最大剪应力峰值由中面层位置向路表迁移;车辆的变速及低速行驶是引起爬坡路段车辙变形的主要原因。
Taking CA141 as the representative model, this paper analyzes four possible behaviors of the vehicle after it enters the hill climbing section, calculates the acceleration of acceleration / deceleration shift when climbing uphill based on the dynamic performance parameters, and establishes three-dimensional asphalt pavement under moving load Transient dynamic analysis of the finite element model, under different driving conditions of the road surface of the compressive stress, shear stress and vertical displacement characteristics were analyzed. The calculated results show that the stress response of pavement structure not only has the characteristics of fluctuating but also alternating characteristics in a certain area, and the stress-strain reversal changes. The distribution of compressive stress is mainly concentrated in the range of 0-6 cm Due to the decrease of velocity and the increase of horizontal force, the maximum shear stress at the road surface migrates from the wheel gap to the wheel center. Along the road depth direction, the peak value of the maximum shear stress migrates from the median surface to the road table. And low-speed driving is the main reason that causes the rut deformation of climbing road.