农村公路沥青路面病害分析及典型结构推荐

发布时间：2018-11-10 22:46

【摘要】：目的分析辽宁省农村公路沥青路面病害特征,研究农村公路沥青路面结构设计指标,提出典型路面结构.方法针对农村公路沥青混凝土路面出现的各种病害进行调查分析,总结出对应于不同类型、不同程度病害产生的原因.结合半刚性基层沥青混凝土路面的力学特性和目前提出的多指标控制沥青路面结构设计的思想,提出适应于农村公路沥青路面的结构设计指标.应用所提出的指标进行分析,结合经济因素,提出不同交通等级下的典型路面结构.结果当基层模量衰变至小于300 MPa,基层材料处于松散状态时,面层层底产生拉应力,路表弯沉增加幅度显著.当提出的典型路面结构基层模量为900 MPa时,通过加大基层厚度很难实现特重交通的承载能力要求.结论辽宁地区农村公路沥青路面设计指标采用设计弯沉值和基层层底拉应力.考虑冬季低温的影响,验算沥青面层低温抗裂这一指标.
[Abstract]:This paper analyzes the disease characteristics of asphalt pavement of rural highway in Liaoning province, studies the structural design index of asphalt pavement of rural highway, and puts forward the typical pavement structure. Methods various diseases of asphalt concrete pavement of rural highway were investigated and analyzed, and the causes corresponding to different types and different degrees of diseases were summarized. Combined with the mechanical characteristics of semi-rigid base asphalt concrete pavement and the idea of multi-index control asphalt pavement structure design, the structural design index suitable for rural highway asphalt pavement is put forward. The typical pavement structure under different traffic grade is put forward by using the proposed index and combining with economic factors. Results when the base modulus decays to less than 300 MPa, the tensile stress is produced at the bottom of the surface and the deflection of the road surface increases significantly. When the base modulus of typical pavement structure is 900 MPa, it is difficult to meet the requirement of carrying capacity of super heavy traffic by increasing the thickness of base course. Conclusion Design deflection value and base layer tensile stress are adopted in the design index of asphalt pavement of rural highway in Liaoning area. Considering the effect of low temperature in winter, the index of low temperature crack resistance of asphalt surface is checked.
【作者单位】：沈阳建筑大学交通工程学院;
【基金】：国家自然科学基金项目(40673045)
【分类号】：U416.217;U418.6

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