预施微裂缝技术减少半刚性基层沥青路面开裂的研究

发布时间：2018-08-14 13:39

【摘要】：半刚性基层具有优良的板体性、较高的强度、便于就地取材,并具有较低的价格,但抗冲刷性较差,因此适宜作为高等级道路的基层或底基层。但由于在集料中添加了具有水硬性材料的添加剂,在温湿状况发生改变时容易引起结构开裂。如果面层产生裂缝不仅影响行车舒适性,还会导致裂缝处发生咬边或错位,结构粒料剥落,在动水作用下还会造成路基掏空等病害,从而降低路面使用寿命。本文采用了预施微裂缝技术控制路面开裂的发生,在总结分析现有成果的基础上,采用室内试验的方法,测试了施加预裂措施试件的强度增长关系和组合梁试件的弯拉疲劳特性,得出了预裂措施不仅能保持原有试件的基本强度,还能减少在车辆荷载作用下的变形能力;并通过断裂力学原理进行了多裂缝模型的探讨,以及运用损伤力学进行了损伤度的分析;最后从细观及能量变化的角度对预施微裂缝技术减少半刚性基层开裂的机理进行了分析。预施微裂缝技术处理半刚性基层,不仅不减弱原有材料结构的性能,还能降低应对外在作用的变形能力,从整个道路使用周期来看,既延长了使用年限,又节约了建设、养护的费用,是应对路面开裂值得推广的一项新方法、新技术。
[Abstract]:The semi-rigid base has the advantages of excellent plate, high strength, easy to use local materials, low price, but poor scour resistance, so it is suitable to be used as the base or base of high grade road. However, due to the addition of additives with hydraulics in the aggregate, structural cracking is easy to occur when the temperature and humidity state changes. If the surface cracks not only affect the driving comfort, but also lead to the cutting edge or dislocation of the cracks, the structure grain peeling off, under the action of dynamic water, it will also cause subgrade cutting and other diseases, thus reducing the pavement service life. In this paper, the pre-applied micro-crack technology is used to control the pavement cracking. Based on the analysis of the existing results, the indoor test method is adopted. The relationship of strength growth of specimens with pre-cracking measures and flexural fatigue characteristics of composite beam specimens are tested. It is concluded that the pre-splitting measures can not only maintain the basic strength of the original specimens, but also reduce the deformation capacity under the action of vehicle loads. The multi-crack model is discussed by the principle of fracture mechanics, and the damage degree is analyzed by using the damage mechanics. Finally, the mechanism of reducing semi-rigid base cracking by pre-applied micro-crack technology is analyzed from the point of view of meso and energy variation. Pre-application of micro-crack technology for semi-rigid base course not only does not weaken the performance of the original material structure, but also reduces the deformation ability to deal with external effects. From the view of the whole road service cycle, it not only prolongs the service life, but also saves the construction. The cost of maintenance is a new method and new technology which is worth popularizing to deal with pavement cracking.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.217;U418.66

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