中南地区典型沥青路面结构的层间界面模型研究

发布时间：2018-07-27 12:05

【摘要】：路面的铺筑一般是多层的。按照层位功能和材料的不同,划分为面层、基层和土基,依据具体的情况,面层又可分为上面层、中面层和底面层,基层包括上基层、下基层、底基层或者垫层等等。任意两层之间的界面称之为层间界面。目前我国路面设计理论,是以多层弹性体系理论为基础,并假设层间界面是完全连续的。但实际道路中,层间界面的接触状态比较复杂,既不是完全连续,也并非处于完全滑动状态。这就使得实际路面结构在车辆荷载作用下所产生的力学响应,与理想状态下的力学响应有较大的差异;另一方面,国内外已有的研究发现,路面病害如滑移裂缝、车辙、推挤和拥包等,严重影响道路的使用性能。而层间粘结状态的恶化,是导致路面出现滑移裂缝、加速路面病害产生的主要因素之一。沥青路面的使用寿命和结构行为与它的层间接触状态有着直接的联系。因此,弄清楚路面层间结合状态至关重要。层间界面模型可以用来描述沥青路面结构层间的结合状态,并用具体的公式来描述力与位移之间的关系。直接获得沥青路面层与层之间的结合状态很困难,只能选择模拟的办法,并通过实验室试验来获得。通常的做法是:对现场取回的芯样或实验室试件进行剪切试验,然后通过数据分析的手段,得到某些条件下的层间界面模型。目前已有层间界面试验模型,是以三个参数,即层间粘结系数K,层间极限抗剪强度Smax、摩擦系数mu,来描述路面实际层间粘结状态。由于材料的差异性,以及加载条件、试验温度、试验器材等因素的影响,这些参数或得到的结论,并不具有通用性。本文基于国内外相关试验方法和研究结果,以Goodman模型来描述沥青路面层间界面在一定加载条件下的力和位移的关系,并以中南地区的材料、温度状况为基础,选择不同的试验温度、不同的粘层油用量以及不同的粘层油类型,利用实验室UTM多功能试验机和自行开发的试验夹具,进行层间粘结强度的直接剪切试验;然后通过回归的方法分析试验数据,从而得出了在不同条件下,沥青混合料试件关于层间界面剪切强度的大致规律。本文的研究发现:不同的温度,不同的粘层油种类及其用量,对层间界面模型影响较大;在同一粘层油类型及用量的情况下,随着温度的升高,层间粘结系数K值不断减少,层间极限抗剪强度Smax值不断减小。
[Abstract]:The pavement is usually multilayered. According to different layer function and material, divide into surface layer, base course and soil foundation, according to the concrete situation, the surface layer can be divided into upper layer, middle surface layer and bottom layer again, the basic course includes upper base, bottom base or cushion layer and so on. The interface between any two layers is called an interlayer interface. At present, the theory of pavement design in China is based on the theory of multilayer elastic system, and the interlayer interface is assumed to be completely continuous. However, the contact state of the interlayer interface is complex, which is neither completely continuous nor in a complete sliding state. This makes the mechanical response of actual pavement structure under vehicle load different from that under ideal condition. On the other hand, existing researches at home and abroad have found that pavement diseases such as slip cracks, ruts, etc. Push, squeeze and pack, seriously affect the performance of the use of roads. The deterioration of interlayer bond state is one of the main factors that lead to slip cracks and accelerate pavement disease. The service life and structure behavior of asphalt pavement are directly related to its interlayer contact state. Therefore, it is very important to understand the state of pavement interlayer bonding. The interlayer interface model can be used to describe the joint state of asphalt pavement structure, and the relationship between force and displacement can be described by concrete formula. It is very difficult to obtain the joint state between asphalt pavement layer and asphalt pavement layer directly, so we can only choose the method of simulation and get it through laboratory test. Usually, shear tests are carried out on the core samples or laboratory samples taken from the field, and then the interlaminar interface model under certain conditions is obtained by means of data analysis. At present, the interlayer interface test model is used to describe the actual interlaminar bond state of pavement with three parameters, I. e., interlaminar bond coefficient K, ultimate shear strength S _ max and friction coefficient mu. Due to the difference of materials, the influence of loading conditions, test temperature and test equipment, these parameters or conclusions are not universal. Based on the relevant test methods and research results at home and abroad, this paper uses Goodman model to describe the relationship between the forces and displacements of the interlayer interface of asphalt pavement under certain loading conditions, and based on the material and temperature conditions in the central and southern region. The direct shear test of interlaminar bond strength was carried out by using the laboratory UTM multifunctional testing machine and the self-developed test fixture by selecting different test temperature different amount of viscous layer oil and different types of viscous layer oil. Then the experimental data are analyzed by regression method, and the approximate law of interlayer shear strength of asphalt mixture specimen under different conditions is obtained. In this paper, it is found that the interlayer interface model is greatly affected by different temperature, different types and amounts of viscous oil, and the interlaminar adhesion coefficient K value decreases with the increase of temperature when the type and amount of oil in the same viscous layer increase, the interlaminar adhesion coefficient K value decreases with the increase of temperature, and the interlaminar adhesion coefficient decreases with the increase of temperature. The ultimate shear strength (Smax) of interlayer is decreasing.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217

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