饱水沥青路面的粘弹性动力响应  

Viscoelastic Dynamic Response of Saturated Asphalt Pavement

作　　者：张斌[1] 赵颖华[1] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《公路交通科技》2012年第4期23-28,共6页Journal of Highway and Transportation Research and Development

摘　　要：将沥青混合料假设为粘弹性体,应用沥青混合料的蠕变试验结果,拟合蠕变应变公式,建立粘弹性本构关系。将单圆均布荷载作用下的饱水沥青路面简化为空间轴对称问题,建立二维的有限元模型。应用有限元软件进行求解,并对计算结果进行详细地分析,得出以下结论:在行车荷载作用后,路面表面的竖向位移没有完全恢复,产生了竖向永久变形;由于沥青面层(粘弹性体)的应变恢复的速度小于基层(弹性体)的应变恢复速度,导致了路面结构中存在残余应力;在沥青面层(粘弹性体)的应变中,弹性应变部分完全恢复,蠕变应变部分没有完全恢复,大部分的不可恢复的蠕变应变残留在沥青面层中。Regarded asphalt mixture as viscoelastic body, the creep strain formula was fitted by using the data of the creep test, and the viscoelastic constitutive relation of asphalt mixture was established. The saturated asphalt pavement under single circle distributed load was simplified as a spatial axisymmetric problem, and the 2D FE model of asphalt pavement was established. This 2D FE model was solved by using the finite element software, and the results were analyzed in detail. The results show that （ 1 ） the vertical displacement of the pavement surface did not recover completely after vehicle loads disappeared, and most of the vertical displacement stayed as the permanent displacement; （2） because the recovering rate of strain of asphalt surface course （ viscoelastic body） was less than that of base course （ elastic body）, residual stresses stayed in the asphalt pavement; （3） the strain of the asphalt surface course includes the elastic strain which recovered completely and the creep strain which recovered incompletely, and most of unrecovered creep strain stayed in pavement as the residual stain.

关 键 词：道路工程 沥青路面 有限元 粘弹性 水损害 

分 类 号：U416.217[交通运输工程—道路与铁道工程]