特重交通荷载下碎石化加铺沥青路面结构的研究

发布时间：2018-04-13 18:34

本文选题：旧水泥混凝土路面 + 碎石化技术　；参考：《南华大学》2014年硕士论文

【摘要】：截止2013年年末,全国公路总里程达435.62万公里,较2012年年末公路里程增幅约2.8%,根据官方数据分析,我国2013年年末有铺装路面和简易铺装路面公路里程至少287.7万公里,有铺装路面235.94万公里,其中沥青混凝土路面65.99万公里,水泥混凝土路面169.95万公里。在今后相当长一段时间里,它将仍然是车辆通行路面结构的主要形式。水泥混凝土路面在车辆超载或临近使用年限时,均易出现断板、错台、板底脱空等病害,严重影响车辆行车安全。目前针对水泥路面改造加铺沥青面层的方式基本为“白+黑”和“白改黑”两种方式,但是怎么设计合理的加铺沥青路面结构,仍然是是工程技术人员的重要研究课题。根据本区域国道G107线路面改造工程实例,分析研究了碎石化技术在该项目的应用情况,重点分析了碎石化加铺沥青路面结构设计、施工技术要求及项目的实施控制。针对特重交通荷载等级下,国道G107路面改造工程的碎石化加铺沥青路面的结构方案(该项目设计加铺方案:45cm水泥稳定碎石基层+10cm沥青混凝土面层)进行优化分析。采用ANSYS有限元软件建模分层分析碎石化加铺沥青路面结构,分别考虑在标准轴载100kN和超载120kN作用下的层底拉应力及温度应力的力学性能,最终分析出最优的碎石化加铺沥青路面的结构组合为:35 cm水泥稳定碎石基层+10 cm沥青混凝土面层,并利用层状弹性体系理论程序HPDS2011对该优化结构层进行验算。经验算,该优化结构满足项目设计要求。国道G107路面改造工程加铺沥青路面结构的设计是在特重交通荷载等级下进行的,笔者由此进一步分析交通荷载等级对碎石化加铺沥青路面结构的影响,其中研究了加铺结构厚度与累计标准轴次的关系,并提出对应不同交通荷载等级的碎石化典型结构层方案。分析认为:中等、重交通荷载等级下的项目,碎石化后加铺沥青路面时,可直接加铺沥青砼面层;特重交通荷载等级的项目,碎石化后加铺沥青路面时,必须加铺新的水泥稳定类基层。
[Abstract]:By the end of 2013, the total mileage of highways in China had reached 4.3562 million kilometers, an increase of about 2.8 percent over the end of 2012. According to official data, there were at least 2.877 million kilometers of paved and simple paved roads in China at the end of 2013.There are pavement 2.3594 million km, including asphalt concrete pavement 659900 km, cement concrete pavement 1.6995 million km.It will remain the main form of road structure for a long time to come.When the vehicle is overloaded or near the annual limit of service, the cement concrete pavement is prone to break the board, stagger and empty the bottom of the slab, which seriously affects the safety of the vehicle running.At present, there are two ways of paving asphalt surface for cement pavement reconstruction: "white and black" and "white to black", but how to design reasonable asphalt pavement structure is still an important research topic for engineers and technicians.Based on the example of the reconstruction of G107 line surface of the national highway in the region, the application of the gravel technology in the project is analyzed, and the structural design, construction technical requirements and the implementation control of the project are emphatically analyzed.Under the heavy traffic load grade, the structure scheme of macadam overlay asphalt pavement of National Highway G107 pavement reconstruction project (the project design overlay scheme: 45cm cement stabilized macadam base 10cm asphalt concrete surface layer) was optimized and analyzed.The ANSYS finite element software is used to model and analyze the asphalt pavement structure. The mechanical properties of tensile stress and temperature stress under the action of standard axial load 100kN and overload 120kN are considered respectively.Finally, it is found that the optimal asphalt pavement structure combination is 10 cm asphalt concrete surface layer with 10 cm cement stabilized macadam base, and the optimized structure layer is checked by the layered elastic system theory program HPDS2011.Empirical calculation shows that the optimized structure meets the requirements of project design.The design of overlay asphalt pavement structure of National Highway G107 pavement reconstruction project is carried out under the special heavy traffic load grade. The author further analyzes the influence of traffic load grade on the asphalt pavement structure of macadam overlay.The relationship between the thickness of the overlay structure and the accumulative standard axial number is studied, and a typical gravel structure with different traffic load levels is proposed.The analysis shows that the items under medium and heavy traffic load grade can be directly overlaid with asphalt concrete when the asphalt pavement is covered with crushed stone, and the items with heavy traffic load grade can be paved with asphalt pavement after crushed stone.A new cement stabilized base must be added.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217

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