基—面层间界面力学强度对沥青路面路用性能影响分析

发布时间：2018-03-06 20:13

本文选题：沥青路面　切入点：层间接触　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着交通建设的迅速发展，沥青路面已成为我国高等级公路的主要路面形式。现行沥青路面设计规范中，以假设路面结构为多层弹性连续体系为前提进行结构设计。实际上沥青路面结构层之间并非完全连续状态，而是处于一种摩擦接触状态。层间接触状态的好坏对沥青路面结构力学影响较大，直接关系到路面的使用性能，有必要对沥青路面层间接触状态展开研究。沥青路面基层和面层材料差异较大，基-面层间接触问题更加特别，因此本文主要研究基-面层间接触问题。以水泥稳定碎石沥青路面结构为研究对象，具体研究内容如下：第一，借助BISAR软件对半刚性基层沥青路面基-面层间力学强度进行分析，研究基层和面层材料对基-面层间受力的影响。得到了基-面层间剪应力、正应力与基层模量、基层厚度、面层模量、面层厚度、垂直荷载、水平荷载之间的变化规律。第二，采用自制夹具，以电子万能实验机为平台，对试件进行基-面层间抗剪试验，探究试验条件变化与基-面层间抗剪强度之间的关系，建立了基-面层间温度-加载速率-抗剪强度的相关关系，，发现温度和加载速率都会对层间抗剪强度产生明显影响，并且温度影响更为显著。第三，通过高温车辙和浸水车辙试验，利用正交试验方法，分析了基层强度、下封层类型、透层油的撒布量对路面结构车辙的影响，三者的影响程度是：基层强度＞下封层类型＞透层油的撒布量。第四，利用ABAQUS有限元软件建立三维路面模型，模拟计算了基-面层间摩擦接触和连续接触两种状态下的路面结构力学响应，得到了路表弯沉、横向水平拉应力、纵向水平拉应力、竖向剪应力、纵向剪应力以及横向剪应力等力学指标的变化规律，对分析路面破坏原因与基-面层间接触状态的关系提供了重要依据。论文得到了交通土建工程材料国家地方联合工程实验室开放基金项目“沥青路面结构层层间界面形态和细观力学行为与路面疲劳损伤关系研究”的资助。
[Abstract]:With the rapid development of traffic construction, asphalt pavement has become the main form of pavement of high grade highway in China. The current design specification of asphalt pavement, the pavement structure is based on the assumption that the multilayer elastic continuous system is the premise of structure design. In fact between the asphalt pavement layer is not completely continuous, but in a kind of friction contact state between layers. The contact condition is good or bad influence on asphalt pavement structure, is directly related to the pavement performance, it is necessary to study the contact state between the layers of the asphalt pavement.
The difference between base and surface materials of asphalt pavement is quite different. The contact problem between base and surface is more special. Therefore, this paper mainly studies the problem of base plane contact. Taking cement stabilized macadam asphalt pavement structure as the research object, the specific research contents are as follows:
First, using BISAR to analyze the semi - rigid base asphalt pavement surface layer mechanical strength, research base and surface layer material on the base and surface layer stress effects. The base and surface shear stress, normal stress and modulus of base, base thickness, modulus of surface layer, surface layer the thickness, vertical load, horizontal load variation between.
Second, using the self-made fixture, with electronic universal testing machine as a platform, based on the specimen surface shear test, test conditions and research base and surface shear strength relationship between the established base and surface layer temperature and loading rate - correlation between shear strength, hair the temperature and loading rate on shear strength and influence, and the influence of temperature was more significant.
Third, through the high temperature rut and immersion rutting test, the influence of base strength, the type of bottom seal and the amount of penetration oil on Rutting of pavement structure is analyzed by orthogonal test method. The influence degree of the three is: the strength of the base layer, the type of the lower seal layer and the spreading amount of the penetrating oil.
Fourth, the establishment of 3D road model using ABAQUS finite element software, simulate the contact and continuous contact with the pavement structure mechanical response under two kinds of friction between base and surface courses, the road surface deflection, transverse tensile stress, longitudinal tensile stress, vertical shear stress, longitudinal shear stress variation the force and the transverse shear stress and mechanical indexes, provides an important basis for the analysis of relationship between pavement damage reason and foundation surface contact state between layers.
This paper is supported by the open foundation project of the National Civil Engineering Joint Engineering Laboratory of transportation civil engineering materials, "the relationship between the interface morphology and the meso mechanical behavior of asphalt pavement structure" and the relationship between pavement fatigue and damage.

【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】：U416.217

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