不同轴载对含应力吸收层沥青路面的影响分析
2015-10-21姜利赵建峰
姜利 赵建峰
摘要:分析沥青混合料应力吸收层在含有裂缝的半刚性基层复合式路面中的受力状况,对于选择应力吸收层材料和设计道路结构具有指导意义。采用有限元分析方法,建立含应力吸收层沥青路面有限元模型,分析轴载和模量变化对应力吸收层结构的应力影响。结果表明:应力吸收层处于应力极为复杂的位置,尤其是处于裂缝处应力吸收层层底应力集中现象明显,随着应力吸收层模量在一定范围内的提高,能够缓解应力集中现象;随着轴载增大,应力吸收层层底应力明显增加,道路使用寿命降低。
关键词:应力吸收层;沥青路面;轴载;反射裂缝;应力集中
中图分类号:U 416.2;S 773.3文献标识码:A文章编号:1001-005X(2015)01-0088-04
Analysis on the Effects of Different Axle Load on Asphalt
Pavement with Stress Absorbing Layer
Jiang Li,Zhao Jianfeng
(College of Civil Engineering,Northeast Forestry University,Harbin 150040)
Abstract:The analysis on the stress situation of stress absorbing layer of asphalt mix in the semirigid composite pavement that contains cracks has important significance for the selection of stress absorbing layer materials and road structure design.In this paper,a finite element model was established based on the stress absorbing layer in asphalt pavement by finite element analysis method,and the influence of axle load and the modulus of stress absorbing layer on the loading stress of stress absorbing layer was analyzed.The results indicated that the stress absorbing layer was in the position where the stress was extremely complex.The stress concentration was especially obvious on the bottom of the absorbing layer at the cracks.With the increase of the modulus of stress absorbing layer within a certain range,the stress concentration can be relieved.With the increase of axle load,the stress on the bottom of stress absorbing layer increased significantly and the life of the road reduced.
Keywords: stress absorbing layer;asphalt pavement;axle load;reflective cracks;stress concentration
收稿日期:2014-06-10
基金项目:交通运输部科技项目(2009318000088)
第一作者简介:姜利,硕士,副教授。研究方向:道路工程。Email:jiangli_nefu@126.com
引文格式:姜利,赵建峰.不同轴载对含应力吸收层沥青路面的影响分析[J].森林工程,2015,31(1):88-91.目前在我国已建成高等级公路中,90%以上沥青路面采用半刚性基层这种结构形式,半刚性基层有诸多优点,其承载能力和抗变形能力强、抗冻性良好以及成本低等优点;不过半刚性基层最大的缺点就是容易因为干缩或者温缩而产生裂缝,最后产生严重的路面破坏[1]。反射裂缝是目前沥青路面普遍存在的病害形式之一。反射裂缝的出现,不仅破坏了路面的整体性和连续型,影响路表的美观[2];更为严重的是所产生的裂缝为路表水提供了下渗的通道,使路表水通过裂缝进入基层和路基,大大削弱了路基的强度和刚度,加速了沥青路面的破坏,严重影响了路面的使用性能[3-4]。……
