【作者】 范磊；

【导师】 王鹏；

【作者基本信息】 郑州大学 ， 工程（专业学位）， 2014， 硕士

【摘要】 水泥混凝土路面具有刚度大、扩散荷载能力强；强度高、疲劳寿命长；平整度衰减慢、能维持较长时间的高平整度等优点，是高等级路面结构的主要形式之一，近些年来被广泛应用，特别是低等级公路、工矿道路和机场跑道，水泥混凝土路面的应用更加普遍，截止到2012年底，我国水泥混凝土路面公路里程约占公路总里程的39%。但水泥混凝土路面面层板边缘的过早破坏、面层开裂、横缝错台等病害一直困扰着道路工程界。研究中发现：水泥混凝土的热膨胀系数对于水泥混凝土路面结构设计有一定的影响。但是目前大多数研究主要是分析热膨胀系数值的影响因素，对热膨胀系数如何影响水泥混凝土路面结构设计的研究很少。笔者主要针对热膨胀系数对水泥混凝土路面结构设计的影响进行了分析探讨。为了研究热膨胀系数对水泥混凝土路面结构设计的影响，根据我国水泥混凝土路面设计标准方法和美国力学经验设计法，分别采用相应的路面设计软件计算了热膨胀系数对水泥混凝土面层板厚度设计的影响，分析其原因，由于设计标准不同，热膨胀系数对路面厚度设计的影响存在显著差异。我国水泥混凝土路面设计中，热膨胀系数只直接影响温度应力，而美国力学经验设计法，更多地考虑了热膨胀系数对接缝传荷能力以及板角翘曲变形的影响。据此，根据我国规范以及有限元软件数值模拟分析了热膨胀系数对面层板温度应力的影响，同时采用美国力学经验设计法分析了热膨胀系数对水泥混凝土路面横向开裂率以及横缝错台量的影响。并提出了接缝传荷能力预测模型以及水泥混凝土路面疲劳应力计算新思路。结果表明：（1）热膨胀系数对水泥混凝土面层板温度疲劳应力的影响很大，热膨胀系数每增加1×10-6/℃时，温度疲劳应力都会增加10%以上，甚至达到59%。（2）热膨胀系数对水泥混凝土面层板横缝错台量以及横向开裂率的影响都非常大，热膨胀系数每增加1×10-6/℃，横缝错台量增加65%，横向开裂率可以增加400%。（3）热膨胀系数对接缝传荷能力以及板角翘曲变形的影响会直接改变水泥混凝土路面设计厚度。因此，在我国水泥混凝土路面设计中要充分考虑热膨胀系数对温度疲劳应力、接缝传荷能力以及板角温度翘曲变形的影响，优化接缝传荷能力预测模型，改进温度疲劳应力计算方法，并建立适合我国状况的公路水泥混凝土热膨胀系数值试验规程，这可以有效减少水泥混凝土路面病害，为水泥混凝土路面的进一步优化提供参考。更多还原

【Abstract】 Because of stiffness, load capacity and strong diffusion, high strength, longfatigue life, flatness decay slowly to maintain high flatness long time, etc., PCCpavement is one of the main forms of high-grade road construction, which is widelyused, especially in low-grade roads, mining roads and airport runways. By the end of2012, PCC pavement of highways accounted for39%of total length in China. ButPCC surface laminate edge premature destruction, surface cracking, transverse jointfaulting and other diseases have plagued road engineering. The study finds that: thethermal expansion coefficient of PCC has a certain effect on the structural design ofPCC pavement. However, most current research is the analysis of factors affecting thethermal expansion coefficient values, and the coefficient of thermal expansion studyhow they affect the structure of PCC pavement design is rarely. What is analyzed andexplored in this paper focused on the impact of thermal expansion coefficient on PCCpavement structure design.In order to research the effects of coefficient of thermal expansion on the PCCpavement design, some efforts have been done. In the first place, analyzing theinfluence of coefficient of thermal expansion on the design thickness of surface layer,according to the PCC pavement design standard in our country and the United Statesmechanistic-empirical design method, corresponding PCC pavement design softwaresare used. There are significant differences in the influence of coefficient of thermalexpansion on pavement thickness design because of the different design standards. Inour country, there are effects of coefficient of thermal expansion only on temperaturestress, but in the United States, mechanistic-empirical design method more concernedabout the effects of coefficient of thermal expansion on the joint load transfer and thewarping of slab corner. In the second place, according to the PCC pavement designstandard in our country and finite element numerical simulation software, theinfluence of coefficient of thermal expansion on the temperature stress is analyzed,and the mechanistic-empirical design method is used to analyses the influence of coefficient of thermal expansion on transverse slab cracking and transverse jointfaulting. And joint load transfer prediction model and the new idea about fatiguestress of PCC pavement calculates is proposed.The conclusion is drawn. The first, there is a significant impact of the thermalexpansion coefficient on PCC pavement surface slab fatigue temperature stress,which will increase more than10%, even up to59%when the thermal expansioncoefficient for each additional1×10-6/℃. Second, there are a great effects ofcoefficient of thermal expansion on both transverse slab cracking and transverse jointfaulting, which transverse slab cracking rate increase by400%and transverse jointfaulting rate increase of65%when the thermal expansion coefficient for eachadditional1×10-6/℃. Third, the coefficient of thermal expansion has a great impacton the designing of pavement thickness especially on the joint load transfer and thewarping of slab corner.Therefore, the impact of the thermal expansion coefficient on fatiguetemperature stress, the joint load transfer and the warping of slab corner should befully considered, and load transfer joints prediction model and fatigue thermal stresscalculation methods should be optimized, and the test procedures of coefficient ofthermal expansion of cement concrete should be established, which can effectivelyreduce the PCC pavement diseases and provide a reference for further optimization ofPCC pavement.更多还原