重庆市干线公路水泥混凝土路面性能评价与改建典型结构研究

发布时间：2018-04-17 22:01

本文选题：破损状况 + 坏板率　；参考：《重庆交通大学》2014年硕士论文

【摘要】：目前重庆市干线水泥混凝土路面已使用多年，大部分路面出现了裂缝、角隅断裂、错台、沉陷等病害，一部分道路已超过了设计使用年限。为了满足交通量要求和道路行车，水泥混凝土路面需要大量养护、改建。路面评价对道路养护改建决策起着至关重要的作用，道路改建结构设计对道路使用性能具有重要作用。因此本文主要研究了两个方面的内容：路面评价和改建典型结构设计。本文通过收集和分析干线水泥混凝土路面资料，对路面评价进行研究。分析了重庆市水泥混凝土路面的病害类型和形成原因；通过检测弯沉，调查了选定路段的脱空状况；通过钻孔取芯实测了水泥混凝土面板的厚度、抗压强度、劈裂强度和弯拉强度，分析了选定道路的路面结构承载能力。根据重庆市路面评价的方法，选取120段每段1000m的水泥混凝土路面，分别计算了面积法和板块法的PCI值、坏板率、断板率。探讨了板块法PCI值与面积法PCI值的关系，根据规范中PCI等级的划分对板块法PCI值等级进行划分。采用统计分析的方法，研究了板块法PCI与坏板率的关系，建立了两者之间的关系式，并根据交叉裂缝面积占总破损面积的比例，分析了关系式中系数的取值。根据调查的破碎后模量和其他资料分析，将破碎后混凝土模量界定在70MPa与225MPa之间，并利用BISAR程序分析了在不同模量、不同基层厚度下的弯沉变化量。根据不同模量之间的弯沉差，将破碎水泥混凝土模量进行了等级划分。依据模量和交通量对基层厚度具有影响的理论，验证了破碎后水泥混凝土模量等级划分的合理性。根据对样本干线公路未来交通的预测、轴载换算等，以及重庆市干线公路交通量的实际情况，将干线公路的交通量界定在3×106与2.0×107之间，并划分为4个等级，根据交通量和模量对基层厚度的影响验证了交通量划分的合理性。最终，通过对重庆市干线水泥混凝土路面改建为沥青路面的结构设计方案分析，结合重庆市的实际情况、气候条件、改建材料，，考虑破碎后混凝土模量等级和交通等级，根据二级和三级公路设计的方法，提出了适合重庆市干线水泥混凝土路面改建为沥青路面的典型结构，为今后设计提供借鉴。
[Abstract]:At present, the cement concrete pavement of Chongqing trunk line has been used for many years, and most of the pavement has been damaged by cracks, corner fractures, staggered platforms and subsidence, and some roads have exceeded the design service life.In order to meet the traffic requirements and road traffic, cement concrete pavement needs a large number of maintenance and reconstruction.Pavement evaluation plays an important role in the decision of road maintenance and reconstruction, and the design of road reconstruction structure plays an important role in road performance.Therefore, this paper mainly studies two aspects: pavement evaluation and reconstruction of typical structure design.Through collecting and analyzing the data of cement concrete pavement, this paper studies pavement evaluation.This paper analyzes the disease types and causes of cement concrete pavement in Chongqing, investigates the void condition of selected sections of road by detecting deflection, and measures the thickness and compressive strength of cement concrete slab by drilling and coring.The load bearing capacity of pavement structure of selected road is analyzed by splitting strength and bending tensile strength.According to the method of road surface evaluation in Chongqing, the PCI value, broken slab rate and broken slab rate of each section of 120 sections of cement concrete pavement were calculated by area method and plate method respectively.The relationship between the PCI value of plate method and the PCI value of area method is discussed, and the PCI value grade of plate method is divided according to the division of PCI grade in the code.By means of statistical analysis, the relationship between plate method PCI and broken plate rate is studied, and the relationship between them is established. According to the proportion of cross crack area to total damaged area, the value of coefficient in the relationship is analyzed.According to the analysis of the post-crushing modulus and other data, the modulus of crushed concrete is defined between 70MPa and 225MPa, and the variation of deflection under different modulus and thickness of base is analyzed by BISAR program.According to the deflection difference between different modulus, the modulus of broken cement concrete is classified.According to the theory that modulus and traffic volume have influence on the thickness of base course, the rationality of the classification of modulus of cement concrete after crushing is verified.According to the forecast of the future traffic of the sample trunk highway, the conversion of axle load, and the actual situation of the traffic volume of Chongqing trunk road, the traffic volume of the trunk highway is defined between 3 脳 106 and 2.0 脳 107, and is divided into four grades.According to the influence of traffic volume and modulus on the thickness of base course, the rationality of traffic volume division is verified.Finally, by analyzing the structural design scheme of rebuilding cement concrete pavement into asphalt pavement in Chongqing, considering the actual situation of Chongqing, climate conditions, rebuilding materials, and considering the grade of modulus of concrete and traffic grade after crushing,According to the design method of the second and third grade highway, the typical structure suitable for the reconstruction of Chongqing trunk cement concrete pavement to asphalt pavement is put forward, which can be used for reference in the future design.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.216;U418.8

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