层间接触条件下粘弹性铺装层蠕变分析
Creep Analysis of Viscoelastic Pavement under Interlayer Contact Condition

为了分析粘弹性铺装层在层间接触时的蠕变响应，以简化的桥梁上部结构为例建立了有限元分析模型，分析了在不同荷载形式、不同温度以及不同接触黏聚力下铺装层的蠕变规律。结果表明，冲击荷载作用下沥青层的沉降位移与竖直荷载作用下基本一致，但会产生较大的竖向隆起位移，其蠕变变形更加复杂；加载时间的长短对沥青面层蠕变影响较大，且温度越高，产生的变形越大，进入蠕变稳定期更快；温度主要对面层竖向隆起位移影响较大，其竖向隆起位移随着温度的升高而增大，即在高温时更易产生失稳型车辙；在冲击荷载的长时间加载下，当黏聚力为0.01 MPa时，层间会出现局部滑移；当黏聚力大于0.01 MPa时，沥青面层的蠕变响应保持不变。
In order to analyze the creep response of the viscoelastic pavement layer during interlayer contact, a finite element analysis model was established by simplifying the upper structure of the bridge, and the creep law of the pavement layer was analyzed under different load forms, different temperatures and different contact cohesion. The results show that the settlement displacement of asphalt layer under impact load is basically the same as that under vertical load, but it will produce large vertical uplift displacement, and its creep deformation is more complicated. The larger of the influence of loading time on creep of asphalt surface layer, and the higher the temperature, the greater the deformation, the faster the creep stability period; the temperature mainly affects the vertical ridge displacement of the surface layer, and the vertical bulge displacement increases with the increase of temperature, i.e. when the temperature is high, the unstable rut is more likely to occur; under the long-term loading of the impact load, when the cohesive force is 0.01 MPa, local slip occurs between the layers; when the cohesive force is greater than 0.01 MPa, the creep response of the asphalt surface layer remains the same.