文档介绍：华中科技大学
硕士学位论文
沥青加铺层荷载应力和温度应力的三维有限元研究
姓名:龙丽琴
申请学位级别:硕士
专业:道路与铁道工程
指导教师:何漓江
20051106
摘要
在旧水泥混凝土上面加铺沥青面层由于旧水泥混凝土路面上存在接缝和裂缝等
损坏现象沥青加铺后在使用的短时期内沥青加铺层就会在对应于旧水泥混凝土
板接裂缝的位置出现反射裂缝
本文通过国内外调研理论研究和有限元分析采用 ANSYS 软件进行三维有限
元实体模拟详细分析了旧水泥混凝土路面上沥青加铺层内的应力状态对反射裂缝
的各种影响因素进行了深入的研究在此基础上提出了基层最佳模量的取值探讨
了设置沥青橡胶夹层的阻裂效果以及基层脱空范围对沥青加铺层反射裂缝的影响
分析了加铺层厚度对延缓接缝处反射裂缝的作用此外在层间接触分析中通常采
用的 Goodman 假设和正交各向异性接触模型来分析温度荷载下的受力特性将导致
力学模型的失真本文采用了更符合实际情况的接触模型利用 ANSYS 中热分析和
接触分析的耦合技术详细研究了在温度荷载作用下的接触条件对反射裂缝的影响
分析发现了接触条件是产生温度型反射裂缝的主导因素
为预防和延缓旧混凝土面层和沥青加铺层反射裂缝国内外采用了各种修复措
施文章介绍了主要的几种修复措施并在上述研究的基础上对这些措施进行了比
较和分析为改进在旧水泥混凝土路面上加铺沥青面层的方法提供理论依据
关键词沥青加铺层三维有限元反射裂缝防治措施
I
Abstract
The reflective cracking easily appears in asphalt overlays on existing concrete
pavements because of expansion joint and construction joint existed in the old surface.
Through the study methods such as survey in the world, theoretical research and finite
element analysis, adopting the three-dimension finite element model, detailed analysis of
stress condition in joint area of overlay is given. Many factors to effect on reflection
cracking is studied. On this base, the paper put forward the best base course, discussed the
impact of asphalt rubber interlayer and the effect on reflection cracking if the area of joint is
loss of support, analyzed the function of the thickness of asphalt overlay. IF the stress
caused by temperature load is analyzed by the contact model of Goodman-hypothesis or
orthotropic, the machanics model will be distortion. The paper adopted the contract model
according with the fact, studied the effect of contract condition on reflection cracking,
analyzed the main factor of reflection cracking caused by temperature changes.
Many prevention measures were adopted to prevent and stave the reflection cracking in
the asphalt overlay on existing concrete pavements in the world. The paper introduced many
main prevention measures, pared them. A theoretical basis is provided for
improving