山区高速公路水泥混凝土路面早期断裂成因分析及防治技术研究

发布时间：2018-01-09 00:21

本文关键词：山区高速公路水泥混凝土路面早期断裂成因分析及防治技术研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：从目前我国水泥混凝土路面的使用状况来看，路面板的早期开裂及断板破坏是最为普遍和受关注的问题。引起路面板早期破坏的原因是综合性的，主要包括路面结构设计、材料选择、施工技术、外界环境荷载、工程地质等方面的影响因素。在不同气候分区、不同地质及水文条件下，引起水泥混凝土路面早期病害的最直接因素是不同的。目前，国内外已有大量水泥混凝土路面损伤及断裂特性的研究成果，但有关路面早期开裂的力学分析工作还比较少，有必要进一步加强这方面的研究工作。论文以广东QL高速公路为依托工程，在对路面使用状况进行调查分析的基础上，采取有限元模型计算的方法，从力学性能角度对路面面层早期断裂原因进行分析，并对路面断裂板进行了处治及效果评估。论文取得的研究成果如下： 1．对依托工程水泥混凝土路面的建设及使用状况进行调查和分析，得出车车辆荷载、温度荷载和面板接缝传荷能力差是路面断裂产生的主要影响因素。 2．采用有限元数值分析方法，分析车辆荷载应力及温度应力对水泥混凝土路面受力的影响，得出车辆荷载应力及温度应力的耦合作用是水泥混凝土路面断裂的最重要原因。 3．采用有限元数值分析方法，计算了路面结构隔离层对水泥面板受力的影响，结果表明，设置蜡制养护剂隔离层，减小了面层与基层间的摩擦作用，不利于板底拉应力的控制。 4．采用有限元数值分析方法，分析得出：车辆和温度荷载变化对水泥面板的受力影响较大，，但对贫混凝土基层结构内部的应力状况影响较小；在车辆荷载及温度荷载综合作用下，路面板的纵向开裂将先于横向开裂。 5．采用有限元数值分析方法，对板底脱空状况下的路面结构受力进行计算，结果表明，当板底存在脱空时，在外界荷载作用下，路面板将产生横向及纵向裂缝，但贫混凝土基层结构的应力状况受脱空影响较小，将不会产生开裂。 6．结合路面使用状况调查及数值模拟计算分析，提出了依托工程路面裂缝的处治方案，并对裂缝板的处治效果进行了评估。
[Abstract]:From the current cement concrete pavement in China using condition, early cracking of pavement and broken plate failure is the most common and popular problem. Due to the cause of early damage of pavement is comprehensive, including pavement structure design, material selection, construction technology, environmental load, influencing factors of engineering geology the. In different climate zones of different geological and hydrological conditions, caused by the most direct factors of early diseases of cement concrete pavement is different. At present, research results of domestic and abroad a large number of cement concrete pavement damage and fracture, but the mechanical analysis on early cracking of pavement is still relatively small, it is necessary to further strengthen the research work in this field.
This paper takes Guangdong QL expressway project, on the basis of investigation and Analysis on the using condition on the road, take the finite element model calculation method, carries on the analysis from the perspective of the mechanical properties of pavement early fracture, and fracture of pavement board for the treatment and effect evaluation. The research achievements are as follows:
1., based on the investigation and analysis of the construction and application of cement concrete pavement relying on engineering, it is concluded that vehicle traffic load, temperature load and poor load transfer capability of joint face are the main factors affecting pavement fracture.
2., the finite element numerical analysis method is used to analyze the influence of vehicle load stress and temperature stress on the cement concrete pavement force. It is concluded that the coupling effect of vehicle load stress and temperature stress is the most important reason for the fracture of cement concrete pavement.
3., the finite element numerical analysis method is used to calculate the influence of pavement isolation layer on the force of cement panel. The results show that setting up wax curing agent isolation layer reduces the friction between the surface layer and the base layer, and is not conducive to the control of the tensile stress at the bottom of the plate.
4. using the finite element numerical analysis method, analysis results show that the impact of temperature change on the vehicle and the load of cement panel larger force, but the internal structure of lean concrete base should be less impact force; in the vehicle load and temperature loads, pavement longitudinal cracking will precede transverse cracking.
5. using the finite element numerical analysis method, the pavement structure of the void under the condition of the stress calculation results show that when the plate bottom are void, under external load, pavement will produce lateral and longitudinal cracks, but lean concrete base structure stress conditions by the void less influence, will produce crack not.
6., combined with the investigation and numerical simulation analysis of pavement condition, a treatment plan based on engineering pavement cracks is put forward, and the treatment effect of cracked plate is evaluated.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.216;U418.6

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