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为分析多轴移动荷载下沥青路面的动态响应特性,通过现场调查建立了不同轴型作用下沥青路面的三维有限元模型,分别研究了单后轴、双后轴及三后轴轴载均匀分布、三后轴车轴载不均匀分布及三后轴车前轴悬空条件下对路面的影响。结果表明:多轴车轴距大于3 m时,各轴对路面的作用相互独立,轴数的增加对路面竖向位移产生叠加作用,对路表最大剪应力及压应力影响不明显;三后轴车中轴对路面竖向位移作用最大,较前轴及后轴分别增大23.7%和18.2%,中轴及后轴对路表剪应力有一定影响,而各轴对路表最大压应力基本没有影响。研究结果显示多轴车轴载不均匀分布对路面破坏会产生较大影响。
In order to analyze the dynamic response characteristics of asphalt pavement under multi-axis moving loads, a three-dimensional finite element model of asphalt pavement under different axle types was established through on-site investigation. The axial load of single rear axle, double rear axle and three rear axle were studied respectively Distribution, uneven distribution of the three rear axle axles, and the influence of the three rear axle front axles on the road under the conditions of vacancy. The results show that the effect of each axis on the pavement is independent when the wheelbase of multi-axle is more than 3 m. The increase of the number of axes has a superposition effect on the vertical displacement of pavement, but has no obvious influence on the maximum shear stress and compressive stress of the road surface. Axle on the road vehicle vertical displacement of the largest role than the front axle and the rear axle increased by 23.7% and 18.2%, respectively, the central axis and the rear axle on the road surface shear stress has a certain impact, and each axis on the road surface maximum compressive stress No effect. The results show that the uneven distribution of multi-axle vehicle axle load will have a greater impact on road damage.