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采用有限元法分析车辆超载对于沥青路面的影响.通过蠕变试验结果拟合蠕变应变公式,建立黏弹性本构关系.将沥青路面简化为二维有限元模型,计算不同荷载作用下的沥青路面结构的动力响应.结果表明:由于孔隙水承担了部分荷载,车辆超载对于无水状态下沥青路面的影响要大于饱水状态下的;应力极值集中在沥青上面层的上半部分,车辆超载对于上面层的影响最明显;蠕变应变占应变的80%左右,而且恢复速度很慢,在较长时间内沥青路面残留有蠕变应变.
The influence of vehicle overloading on asphalt pavement was analyzed by finite element method.The creep strain was fitted by the creep test results to establish the viscoelastic constitutive relationship.The asphalt pavement was simplified as a two-dimensional finite element model and the asphalt under different loadings was calculated The dynamic response of the pavement structure is studied.The results show that the vehicle overload affects the asphalt pavement under waterless condition more than the saturated condition because of the partial load of pore water.The stress extreme value concentrates on the upper half of the asphalt pavement, The effect of overloading on the top layer is the most obvious. The creep strain accounts for about 80% of the strain, and the recovery speed is very slow. The creep strain remains on the asphalt pavement for a long time.