重载沥青路面结构分析与性能评价
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摘要
沥青路面是我国高等级公路路面结构的主要形式之一。随着重载交通的出现与形成，沥青路面早期破坏现象愈来愈普遍，重载已成为影响路面服务性能和缩短路面使用寿命的重要因素之一。由于交通、环境、轴组、路基路面结构、施工质量及维修政策因时因地而异，造成路面损坏的原因也各不相同。为此，本论文从具体路面状况和理论分析两方面入手，对重载沥青路面进行结构分析与性能评价。
论文首先就国道108线广北段二期工程的路面状况调查结果，对各种路面病害的原因进行了分析，特别是附加结构响应对路面早期破坏的影响。其次，以商业软件ANSYS为计算工具，应用弹性和弹塑性理论，对重载沥青路面进行数值仿真分析，研究了路面结构在双轮车辆荷载作用下的力学响应，分析讨论了超重荷载、路面类型与结构组合对沥青路面的应力应变、承载能力及疲劳寿命等方面的影响，同时探讨了不同超限量对路面关键响应的变化规律。最后，结合具体实例，将理论分析结果与路面的实际特征和状态作了对照分析。
论文研究结果表明：施工质量和外界环境是导致路面损坏的外因；重载交通使路面关键响应增大，使路面的损坏过程加快、损坏程度加深，结构组合影响路面各结构层性能的发挥，制约着路面的使用性能和使用寿命，这两者都是路面损坏的内因。论文的研究成果对路面结构设计、公路管理及养护维修具有指导意义，为今后重载交通沥青路面设计提供了一些可供参考的有价值的思路。
Asphalt pavement is one of the primary structures for main roads in China. Along with the appearing and forming of the heavy-loaded traffic in recent years,the premature failure of asphalt pavements is becoming more and more widespread. Consequently, Over loading has become one of the key factors which influence the in-servive performance of pavements and shorten the natural life of pavements.Due to the variation in traffic, environment, axle configuration, subgrade condition, pavement structure, construction quality, and maintenance policy from agency to agency, from place to place, the deterioration of pavement may be caused by different factors. Therefore, the structural analysis and performance evaluation of heavy-loaded asphalt pavement have been conducted on two aspects about specific pavement conditions and theoretical analysis in this thesis.
In this thesis, firstly, based on the investigation results of pavement status of highway pavement structures in the 2nd phase of Guangbei Section of National Highway 108 (Beijing to Kunming),the causes of pavement deteriorations were analysed, especially, the factor of additional structural responses influencing pavement distress, especially premature failure,was analysed, the measures of prevention and cure for pavement failure were put forward. Secondly, Numerical simulation analysis about heavy-loaded asphalt pavement was performed using elastic and elastic-plastic theories with commercial finite element analysis software-ANSYS.and the mechanical responses of pavement in two cyclic traffic loads were studied. Also, the influences on the asphalt pavement,such as the stress, the strain, the carrying-capacity and the fatigue-national life, by the factors about over-loadings, pavement styles and structural layer combinations, were analysed and discussed.At the same time,the changed characters of key response
s of pavement which conducted by the loads, which preponderated over the allowable weight, were discussed too. Finally, the theoretical analysis results were compared to the actual characters and states of pavement by specific examples.
The results of the thesis show that construction quality and environment condition be the exterior factors in the development of pavement deteriorations. Heavy-loaded traffic can be brought on increasing critical responses of pavement, accelerating the process of pavement deteriorations and making the deterioration degree deepper. And the structural layer combination can influence pavement performance, can restrict the in-servive performance of pavement and can determine it's natural life too. Both the above two factors(Namely, heavy-loaded traffic and structural layer combination) are the interior factors in the formation of pavement dilapidations. Major conclusions drawn from this study can be beneficial to the structural design, supervision, maintenance, and rehabilitation of pavements for roads. And offer some useful thoughtways, which are referenced and valuable for heavy-loaded asphalt pavement design in future.
论文首先就国道108线广北段二期工程的路面状况调查结果，对各种路面病害的原因进行了分析，特别是附加结构响应对路面早期破坏的影响。其次，以商业软件ANSYS为计算工具，应用弹性和弹塑性理论，对重载沥青路面进行数值仿真分析，研究了路面结构在双轮车辆荷载作用下的力学响应，分析讨论了超重荷载、路面类型与结构组合对沥青路面的应力应变、承载能力及疲劳寿命等方面的影响，同时探讨了不同超限量对路面关键响应的变化规律。最后，结合具体实例，将理论分析结果与路面的实际特征和状态作了对照分析。
论文研究结果表明：施工质量和外界环境是导致路面损坏的外因；重载交通使路面关键响应增大，使路面的损坏过程加快、损坏程度加深，结构组合影响路面各结构层性能的发挥，制约着路面的使用性能和使用寿命，这两者都是路面损坏的内因。论文的研究成果对路面结构设计、公路管理及养护维修具有指导意义，为今后重载交通沥青路面设计提供了一些可供参考的有价值的思路。
Asphalt pavement is one of the primary structures for main roads in China. Along with the appearing and forming of the heavy-loaded traffic in recent years,the premature failure of asphalt pavements is becoming more and more widespread. Consequently, Over loading has become one of the key factors which influence the in-servive performance of pavements and shorten the natural life of pavements.Due to the variation in traffic, environment, axle configuration, subgrade condition, pavement structure, construction quality, and maintenance policy from agency to agency, from place to place, the deterioration of pavement may be caused by different factors. Therefore, the structural analysis and performance evaluation of heavy-loaded asphalt pavement have been conducted on two aspects about specific pavement conditions and theoretical analysis in this thesis.
In this thesis, firstly, based on the investigation results of pavement status of highway pavement structures in the 2nd phase of Guangbei Section of National Highway 108 (Beijing to Kunming),the causes of pavement deteriorations were analysed, especially, the factor of additional structural responses influencing pavement distress, especially premature failure,was analysed, the measures of prevention and cure for pavement failure were put forward. Secondly, Numerical simulation analysis about heavy-loaded asphalt pavement was performed using elastic and elastic-plastic theories with commercial finite element analysis software-ANSYS.and the mechanical responses of pavement in two cyclic traffic loads were studied. Also, the influences on the asphalt pavement,such as the stress, the strain, the carrying-capacity and the fatigue-national life, by the factors about over-loadings, pavement styles and structural layer combinations, were analysed and discussed.At the same time,the changed characters of key response
s of pavement which conducted by the loads, which preponderated over the allowable weight, were discussed too. Finally, the theoretical analysis results were compared to the actual characters and states of pavement by specific examples.
The results of the thesis show that construction quality and environment condition be the exterior factors in the development of pavement deteriorations. Heavy-loaded traffic can be brought on increasing critical responses of pavement, accelerating the process of pavement deteriorations and making the deterioration degree deepper. And the structural layer combination can influence pavement performance, can restrict the in-servive performance of pavement and can determine it's natural life too. Both the above two factors(Namely, heavy-loaded traffic and structural layer combination) are the interior factors in the formation of pavement dilapidations. Major conclusions drawn from this study can be beneficial to the structural design, supervision, maintenance, and rehabilitation of pavements for roads. And offer some useful thoughtways, which are referenced and valuable for heavy-loaded asphalt pavement design in future.
引文
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