车辆超载作用下沥青路面黏弹性动力响应分析  

Viscoelastic dynamic response analysis of vehicle overload acing on 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：《大连海事大学学报》2012年第2期117-120,共4页Journal of Dalian Maritime University

摘　　要：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 finite element method was used to analyze the ef- fects of vehicle overload on the asphalt pavement. The creep strain formula was fitted by using the data of creep test and the viscoelastic constitutive relation of asphalt mixtures was estab- lished. The asphalt pavement was simplified as the 2D FE-mod- el. Dynamic responses of vehicle overload on asphalt pavementwere analyzed. Results indicate that the influence of the dry as- phalt pavement is bigger than that with the saturated asphalt pavement, because the pore water bears a part of vehicle load. Extremums of stresses locate in the top part of the top layer, and the influence with the top layer is big. Eighty percent of the strain is the creep strain, and the recovery speed is very slow. The creep strain can exist in the asphalt pavement for a long time.

关 键 词：车辆超载 沥青路面 黏弹性 动力响应 有限元 

分 类 号：U416.217[交通运输工程—道路与铁道工程]