沥青路面弹塑性动力响应分析

采用弹塑性理论，建立了沥青路面弹塑性动力响应分析的三维有限元模型，利用有限元法分析了沥青路面的弹性和弹塑性动力响应、以及弹塑性状态下层间接触对沥青路面力学性能的影响．结果表明：在相同条件下，沥青路面为弹塑性状态时得到的弯沉和最大主应变均比弹性状态时大；卸载后，弹塑性状态时存在残余变形，说明沥青路面的弹塑性动力学响应分析得到的结果和路面实际情况较符合；沥青路面在弹塑性状态下，层间完全光滑时其弯沉是完全连续时的6 倍，上面层最大竖向应变是层间连续时的3.7 倍，下面层处最大竖向应变是层间连续时的2.3 倍；卸载后，层间完全光滑时，面层A 点与B 点均存在残余应变；随着层间摩擦系数的增大，路面弯沉值减少，说明在弹塑性状态下，层间接触状态对沥青路面的动力响应有较大影响．

Analysis for Elasto-Plastic and Dynamic Response of Asphalt Pavement

Elasto-plastic theory was used, and a three-dimensional finite element model was established. The elastic and elasto-plastic dynamic response of asphalt pavement and the influences of mechanics property of interlayer contact for asphalt pavement on elasto-plastic state were analyzed by using finite element method.The results show that under the same conditions, the defection and the maximum principal strain of elasto-plastic state are larger than those of elastic state. After unloading, there is residual deformation for the elasto-plastic state, which illustrates that it is more reasonable to consider the elasto-plastic-dynamic response for asphalt pavement. When the interlayer as completely smooth, the deflection is about 6 times as large as that for completely continuous case, the vertical strains of the upper layer and the bottom layer are 3.7 times and 2.3 times as large as that for completely continuous case respectively. After unloading, there is residual deformation at Point A of the upper layer and Point B of the bottom layer for a completely smooth state of interlayer. With the increase of the interlayer friction coefficient, the deflection value of the pavement decreases. This indicates that the contact condition between layers has a great influence on the dynamic response of asphalt pavement at elasto-plastic state.