【作者】 李鑫；

【导师】 朱梦良； 田伟明；

【作者基本信息】 长沙理工大学 ， 道路与铁道工程， 2007， 硕士

【摘要】 水泥混凝土路面作为一种高级路面结构形式，以其强度高、稳定性和耐久性好、耐高温、耐磨耗以及养护费用少等优点而得到了广泛的应用。按照现行路面设计理论，路面结构各层性能正常、层间界面接触理想、设计和施工质量良好的水泥混凝土路面，一般要经过长期使用且达到其设计使用年限后才会开裂破坏。但实际状况是，相当多的路面在使用2-5年甚至更短时间后就出现了不同程度的缺陷或开裂。特别是近年来，道路交通量大幅增长，重轴车辆增多，汽车超载现象严重，更是加速了路面的破坏，重则引起路面产生结构性损伤，导致路面承载能力不足，轻则路面表面行驶功能下降，严重影响行驶的舒适性和安全性。同时，水泥混凝土路面的维修成本高，养生时间长，维修期间交通干扰严重，一旦损坏难于修复。因而，提高对路面结构分析计算的能力，弄清车辆重载对路面结构的影响，加强认清路面的开裂机理和破坏过程，以及增进修复施工技术是当今工程界迫切需要解决的问题。本文针对这几个方面作了一些研究，其主要内容如下：1．对水泥混凝土路面结构进行了有限元分析计算，选取路面板厚度、基层弹性模量、地基土弹性模量、荷载四个参数作为计算变量，比较了各种因素对路面板变形与应力的影响，为水泥混凝土路面结构的设计提供了参考。2．用力学方法系统分析了车辆重载对路面结构的影响，并针对这一问题提出一些对策。3．采用断裂力学的基本理论，分析裂缝缝端受力状况，同时结合路面力学，分析裂缝的扩展过程并分析了荷载、温度和水对路面疲劳寿命的影响。4．对水泥混凝土路面养护、裂缝的维修处理方法进行了系统的研究，结合具体工程介绍了旧水泥混凝土路面修复施工技术。更多还原

【Abstract】 The Cement concrete pavement, as one of the high-grade pavement structures, has been widely used because of such advantages as high strength, good stability, great durability, high temperature stability, abrasive hardness and for cost of maintenance. In line with the theories of the present pavement designs, the cement concrete pavement, with normal performance in the structure of every layer, deal Inter-layer contact as well as good designs and construction, will usually not break until a long time of use or the time designed. But actually, quite a number of such pavements show defects or crackles of varying degrees within 2-5 years or shorter. In recent years, the effect of sharp traffic volume, heavy axis load and overload truck speeds up the damages of the concrete pavement. These damages lead to the destructive of pavement structure and reduce of load carring capacity or lower surface function so that these seriously influence the driving comfort and safety .For this reason. Meanwhile, owing to its features such as high cost far maintenance, severe traffic interference during maintenance, and difficulty in maintenance of what is damaged.So it is a problem for serving immediate solution in present-day projects, to improve the ability of analyzing PCC, to understand fully the influence of heavy load on PCC, to know the fissure mechanism and breaking process of the cement concrete and improve its anti-fissure, and to enhance the maintenance technology. The paper has done some research work about these problems. The main contents of the paper are as follows:1. The analysis was done on PCC using FEM. It defined the thickness of slab, the elastic modulus of base, the elastic modulus of soil and the load of vehicle as the variants. The effect on the stress and displacement concluded, this provided a reference to design PCC.2. It has also analyzed the influence of overloading to pavement structure by mechanical means and put forward a lot of countermeasures.3. The stress status of fissure ends was analyzed with the theory of Fracture Mechanics, and the process of breaking open was analyzed by the mechanics of pavement. In addition, the effects of vehicles, temperature and water on its fatigue life are analyzed.4. The systemic researches were done about the maintenance, fissure servicing, and the renovating and constructing technologies of old PCC were introduced with the practical projects.更多还原