长寿命沥青路面结构设计与研究
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摘要
随着国民经济的持续发展,高速公路建设里程的增加,交通量以及荷载都急剧增长,路面早期破坏也日益严重。针对上述问题,道路工作者提出了长寿命沥青路面(long-lasting pavement或perpetual pavement)的概念,使之成为了国际道路工程界一个新的研究热点。
     本文参考国内外对长寿命路面的定义,根据弹性层状体系理论,采用Bisar3.0程序对拟定的长寿命路面结构进行了路面结构内应力应变情况的计算分析。长寿命沥青路面设计控制指标采用的是沥青层底拉应变εt和路基顶面压应变εc指标。首先,通过采用正交设计法进行路面结构组合设计,分析各个参数对路面结构设计控制指标影响的敏感性,得出沥青层厚度变化对路面结构设计控制指标影响最大。其次,本文对沥青路面各结构层的变形特性进行分析,得出:通过增加沥青层厚度能够使沥青层底拉应变和土基顶面压应变减小并满足长寿面沥青路面要求;土基模量和底基层厚度对减小土基顶面压应变的影响十分显著。对于一定的路面结构,在考虑各结构层参数变化的基础上分析了沥青层的应变变化规律以及沥青层内最大剪应力随路面结构深度加深的变化趋势,比较了高模量层存在时沥青联结层底面和沥青基层底面的应变状况。粗略计算了碎石层的受力情况,并与理论情况进行了比较,确定了碎石层完全受压的条件。文中还论证了土基对整个路面结构设计的重要性。最后根据上述分析结果,拟定了四种长寿命沥青路面结构组合,并在湖南境内株洲市快速环道二期路面工程和醴潭高速公路上铺筑了试验段,为长寿命路面的后续研究提供一个平台。
With the continuing development of the national economy, traffic volume and load grow rapidly. Asphalt pavement early damage is becoming more and more serious day by day. To solve this problem, pavement researchers present a new concept "long-life asphalt pavement". It is a new researching in the field of internantional civil engineering.
     This paper references long-life asphalt pavement's definitions domestic and foreign. According to elastic multi-layer system theory, the author calculates and analyses the long-life asphalt pavement using Bisar 3.0. The design criteria of long-life asphalt pavement are tensile strain at the bottom of asphalt pavementεt and compressive strain on top of the road formationεc. First, this study arranges pavement structure combination based on orthogonal experiment method to analyse sensitivity of pavement structure factors. The principal degree of each factor has been decided, so that it offers important foundation for adjusting pavement structure design. Second, the author analyses deforming characteristic of each asphalt pavement layer. For some pavement structures, through changing each pavement structure layer factor, the author has analysed the strain's changing law of asphalt layer and maximum shearing stress changing tendency with pavement structure depth. At the same time, the strain of asphalt intermediate layer and the strain of asphalt base layer also have been compared. Then the author calculates the stress condition of graded crushed stone, compares with the perfect state and determines the factor of graded crushed stone being compressed completely. The paper also has demonstrated importance of road formation in pavement structure design. At last, the author recommends for long-life asphalt pavement structure according to the analysis mentioned above. Trial pavement section has been paved on Lilin-Xiangtan expressway to support the following research.
引文
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