考虑蠕变固结的高温沥青路面响应仿真  

Analysis of high temperature asphalt pavement response considering the creep consolidation

作　　者：易富[1] 高健[1] 金艳[1] 杨宇婷[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000

出　　处：《辽宁工程技术大学学报（自然科学版）》2014年第11期1480-1483,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：辽宁省教育厅科研基金资助项目(L2013144);辽宁省百千万人才基金资助项目(2011921064)

摘　　要：为研究行车载荷和高温作用下沥青路面的变形演化规律,通过对沥青混合料高温粘弹性特性和行车载荷对路面作用的分析,提出采用修正Burgers模型作为沥青混合料的本构模型,对双轮标准轴载作用下高速公路沥青路面的应力场和变形场进行有限元分析.研究结果表明:路表竖向位移增加最快,沥青混合料发生了流变;面层内部水平应力变化剧烈,底基层底面水平拉应力最大;最大剪应力出现在轮迹两边的面层内部,影响范围主要集中在路面结构层内,沥青混合料发生应力松弛现象;竖向最大应力出现在路表轮迹处,轮迹下方区域内压应力呈衰减趋势分布,面层是产生路面车辙的主要区域.In order to study the deformation evolution of asphalt pavement under the traffic load and high temperature, through analyzing the effect of the viscoelastic properties of asphalt mixture at high temperature and traffic load, this paper proposed the modified Burgers model, and analyzed the stress and deformation fields of highway asphalt pavement under a standard wheel axle loads by finite element. The analytical results show that vertical displacement increases fastest on the road surface, and the rheological phenomenon occurs about the asphalt admixture material. The horizontal stress in the road deck changes severely, and the level of tensile stress is the biggest in the bottom of sub-base. The maximum shear stress appears in the road surface on both sides of the wheelmark and the scope mainly concentrates in the pavement structure layer. The stress relaxation phenomenon occurs about the asphalt admixture material. The vertical maximum appears in the road surface on the wheel track, and the compressive stress follows attenuation trend under the regional of the wheelmark. The surface layer is the main area of the pavement rutting.

关 键 词：沥青路面 高温力学特性 有限元分析 行车载荷作用 蠕变固结 

分 类 号：U416.217[交通运输工程—道路与铁道工程]