沥青路面水损害疲劳破坏过程的数值模拟分析-道路与铁道工程专业论文.docxVIP

摘 摘 要 沥青路面结构内部的孔隙水在高速行车荷载的作用下造成的瞬时超孔隙水 压力，是造成路面水损害的重要原因。由孔隙水压产生的附加应力，使孔隙加大， 贯通形成宏观裂纹并逐渐扩展，加速了沥青路面的破坏。 针对沥青路面水损害问题，本文系统地介绍了国内外研究者在这方面所做 的研究工作，同时对沥青路面水损害产生的原因及过程进行了详细分析，并在此 基础上提出了一系列沥青路面的水损害防治措施。 鉴于目前有关交通荷载作用下路基路面层状弹性体系超孔隙水压力与疲劳 损伤方面的综合分析，国内外还鲜有涉及。因此本文首次以比奥渗流固结理论和 各向同性线弹性损伤理论及疲劳损伤理论为基础，提出沥青路面的水损害力学分 析模型，运用轴对称有限元方法对力学模型进行求解，并编制有限元程序进行数 值模拟分析。文章重点分析了孔隙水压力对沥青路面受力状态的影响，以及在有 孔隙水存在的情况下沥青路面在车载作用下的疲劳损伤过程。 计算结果表明，沥青面层内的孔隙水压力与面层的渗透系数、面层厚度、 结构层材料参数以及车辆行驶速度等有密切关系。当路表孔隙饱水时，在荷载 作用下，孔隙水的存在会导致路面结构应力集中加剧，在荷载的反复作用之下， 导致疲劳开裂破坏，加速路表病害的出现。 关键词：沥青路面水损害孔隙水压力疲劳损伤有限元法 AbstractThe Abstract The instantaneous super pore water pressure produced by the pore water of the inner structure of asphalt pavement,under the action of the 11i曲speed wheel load，is all important reason that results in water damage of the pavement．Additional stess produced by pore water pressure，make the pore enlargement,make pore become large and form the macroscopic cmck which expands gradually,accelerating the breakage ofthe asphalt payment． Aimjng at the problem of water breakage of the asphalt pavement,this paper systematically introduces the domestic and international research for domg this works， simultaneity analyses the reason and processes of water damage of the road surface in detail，and puts forward a series ofmeasures to prevent it．Owing to that the domestic and international have done little about synthetical analysis of super pore water pressure and fatigue damage of the subground and pavement layer flexible system under the action oftraffic load．So this paper first puts forward the mechanics analysis model of water damage of the asphalt pavement,which is based on Blot concretion seepage theory and isotropy linear elastic damage theory and fatigue damage theory, use axis symmetry finite element method to solve this problem and produce a finite element program to simulate it nurnercally．，Ik paper emphatically analyzes the influence which pore water pressure take to asphalt pavement under stress and the fatigue da