中外沥青路面设计方法对比研究

发布时间：2018-03-28 21:31

本文选题：沥青路面　切入点：结构设计理念　出处：《东南大学》2015年硕士论文

【摘要】：随着我国公路对外援建项目(如援非项目)的日益增多,我国公路企业参与国际竞争和交流的机会也大幅增加。中外公路沥青路面在设计与施工等方面的分歧将直接导致建成后的沥青路面使用性能的差异。这就要求我国公路企业对世界范围内有代表性的公路沥青路面设计规范有一个全面、准确、清晰的把握,并通过各国设计规范的对比,找出我国现行规范存在的不足,吸取国外设计规范的先进技术成果,以提升我国公路企业的技术水平,更好地开拓国际市场。(1)沥青路面结构设计理念的对比分析。通过对中外规范中路面结构设计理念的对比,比较了中外路面结构体系划分与功能以及中外路面结构组合与选择方法。研究表明我国规范应根据不同地区的交通特点和资源配置状况,提出更多有针对性的路面组合结构,而不应仅局限于半刚性基层结构。特别是经济发达地区,完全有能力考虑永久性路面结构的建设。(2)沥青路面结构设计方法与指标的对比分析。通过对中外规范中路面结构设计方法与指标的对比发现,由于各国通常采用的路面结构存在差异,导致其设计指标也存在一定差异。美国在路面设计中考虑了路面结构在荷载和环境作用下的累积破坏过程,与实际路面行为更为吻合；法国沥青路面主要设计指标为沥青层底的拉应变以及土基顶面的压应变。我国规范中采用路表弯沉与层底拉应力指标。(3)研究了不同季节对交通量轴载换算、土基回弹模量的影响以及材料动态参数对路面结构设计的影响,并采用轴载换算的季节修正系数、等效土基回弹模量分别代替最不利季节土基回弹模量,用材料动态模量代替静态模量,进行了路面结构设计以及综合结构设计。(4)运用各国设计软件进行路面设计,并运用BISAR3.0软件对中法路面设计结果进行力学分析,计算路面结构的路表弯沉与路基顶面压应变、拉应力与压应变,同时,对我国沥青层疲劳损坏设计指标进行合理性分析。研究表明,拉应力指标已不适合我国沥青路面设计,应选用拉应变指标进行沥青路面结构设计。本文围绕中外沥青路面设计规范的异同点进行研究,希望能有助于以后的相关研究,并对我国的沥青路面设计能有一定的指导作用。
[Abstract]:With the increasing number of highway construction projects (such as aid projects in Africa), The opportunities for Chinese highway enterprises to participate in international competition and exchange have also been greatly increased. Differences in design and construction of asphalt pavement between China and foreign countries will directly lead to differences in the performance of asphalt pavement after completion. State highway enterprises have a comprehensive view of the worldwide specifications for the design of asphalt pavement. Accurately, clearly grasp, and through the comparison of the design codes in various countries, find out the shortcomings of the existing codes of our country, absorb the advanced technical achievements of the foreign design codes, in order to improve the technical level of our country's highway enterprises, Comparing and analyzing the design idea of asphalt pavement structure through the comparison of pavement structure design idea in Chinese and foreign codes, This paper compares the partition and function of pavement structure system between China and foreign countries, as well as the combination and selection methods of pavement structure between China and foreign countries. The research shows that the code of our country should put forward more targeted pavement composite structures according to the traffic characteristics and resource allocation in different areas. It should not be confined to semi-rigid base structures, especially in economically developed areas. Fully capable of considering the construction of permanent pavement structure. 2) comparison and analysis of design methods and indexes of asphalt pavement structure. Because of the difference of pavement structure in different countries, the design index of pavement structure is different. The cumulative damage process of pavement structure under load and environment is considered in the United States, which is more consistent with the actual pavement behavior. The main design indexes of French asphalt pavement are the tensile strain of the asphalt layer bottom and the compressive strain of the top surface of the soil foundation. In the code of our country, the road surface deflection index and the layer bottom tensile stress index .Xi 3) are used to study the conversion of traffic volume axial load in different seasons. The influence of the elastic modulus of soil foundation and the influence of material dynamic parameters on pavement structure design. The seasonal correction coefficient converted by axial load is used to replace the most unfavorable seasonal elastic modulus of soil foundation respectively. Using dynamic modulus of material instead of static modulus, the pavement structure design and synthetic structure design are carried out. The pavement design is carried out by using the design software of various countries, and the mechanical analysis of the pavement design results of China and France is carried out by using BISAR3.0 software. The pavement surface deflection and the compressive strain, tensile stress and compressive strain on the top of the roadbed are calculated. At the same time, the rationality of the fatigue damage design index of the asphalt layer in China is analyzed. The research shows that the tensile stress index is not suitable for the design of the asphalt pavement in China. Drawing strain index should be selected for asphalt pavement structure design. This paper focuses on the similarities and differences between Chinese and foreign asphalt pavement design specifications, hoping to be helpful to the related research in the future, and can have a certain guiding role to the asphalt pavement design in our country.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217

【参考文献】