瞬态温度场与车轮荷载作用下灌缝胶界面力学响应分析

发布时间：2019-01-29 06:18

【摘要】：灌缝胶作为沥青路面裂缝养护工作中的常用材料,多数会发生修补后的胶体粘结界面过早脱粘的现象,学术上称之为粘附性失效。作为开裂养护后路面结构中存在的功能性材料,人们在对灌缝胶效果进行评估时,往往注重胶体材料在实验室中粘附性、针入度、软化点、高温稳定性等类似于沥青材料的评价指标,鲜有文献提及灌缝胶在路面结构中的力学分析。然而,即使所有指标都在允许范围之内的灌缝胶,在用于灌缝修补后,仍会存在失效过早的现象。这是由于灌缝胶在车轮荷载等条件共同作用下,胶体与路面结构粘结界面达到了破坏出现的力学指标。因此,对存在于路面系统中的灌缝胶界面进行力学分析,以得到粘结界面在何种条件下最易出现损伤,对于今后用于养护工作的灌缝胶材料性能评价是极为必要的。首先,灌缝胶粘结界面是典型的内聚力界面,在运用有限元软件对路面系统中的灌缝胶进行力学分析时,ABAQUS中界面单元需要选用合适的参数来表示。因此,通过灌缝胶的拉拔、剪切试验获取内聚力界面的张力位移曲线,将胶体粘结界面参数化处置。其次,为了更为真实的模拟路面系统中灌缝胶的工作状态,文章基于非均布移动荷载作用下,考虑路面面层结构材料和灌缝胶材料的粘弹特性,建立三维路面结构模型。所以文章和对路面模型中的粘弹材料时温参数进行了拟合,并分析了灌缝胶界面在不同工况荷载作用情况下界面单元的力学响应及损伤情况。再次,为了得到车轮荷载与环境温度耦合作用下灌缝胶粘结界面的损伤结果,文章建立了含灌缝胶路面系统的温度场模型,并针对灌缝胶材料与路面面层材料热物性参数的区别进行了测定,得到了含灌缝胶路面系统的温度分布。灌缝胶与路面结构之间的温差也导致了界面之间温度应力的变化。最后,采用顺序耦合的方法分析车轮荷载作用于最不利位置时与路面结构内部温度应力共同作用下的界面损伤程度。分析灌缝胶在耦合场作用下损伤出现的原因及今后路面养护时选取灌缝胶材料应注意的事项。
[Abstract]:As a common material in the crack maintenance of asphalt pavement, the patched colloidal adhesive interface will be removed prematurely, which is called adhesion failure academically. As a functional material existing in pavement structure after cracking and curing, people often pay attention to the adhesion, penetration and softening point of colloidal material in laboratory when evaluating the effect of filling joint glue. The evaluation index of high temperature stability is similar to that of asphalt material, and few references have been made on the mechanical analysis of jointing glue in pavement structure. However, even if all the parameters are within the allowable range, there will still be premature invalidation after being used to repair the joint. This is because the bond interface between the glue and the pavement structure can reach the mechanical index of failure under the joint action of wheel load and so on. Therefore, it is very necessary to evaluate the properties of the jointing adhesive materials used in the maintenance work in the future by means of mechanical analysis of the joint filling interface in road surface system, in order to obtain the conditions under which the bond interface is most vulnerable to damage. First of all, the bonding interface is a typical cohesive interface. When the finite element software is used to analyze the mechanical properties of the seams in the pavement system, the interface elements in ABAQUS need to be represented by appropriate parameters. Therefore, the tension and displacement curves of cohesive interface were obtained by drawing and shearing tests, and the adhesive interface was parameterized. Secondly, in order to simulate the working state of jointing glue in pavement system more realistically, a three-dimensional pavement structure model is established based on the viscoelastic characteristics of pavement surface structure material and jointing glue material under the action of non-uniform moving load. In this paper, the time-temperature parameters of viscoelastic materials in pavement model are fitted, and the mechanical response and damage of interface elements under different load conditions are analyzed. Thirdly, in order to obtain the damage result of the bond interface of the filling joint under the coupling of wheel load and ambient temperature, the temperature field model of the pavement system with joint filling is established in this paper. The temperature distribution of the pavement system with joint filling glue is obtained by measuring the difference of the thermal physical properties between the filling glue material and the pavement surface material. The temperature difference between the joint filling glue and the pavement structure also leads to the change of the temperature stress between the interface. Finally, the sequential coupling method is used to analyze the damage degree of the interface under the action of the wheel load at the most unfavorable position and the internal thermal stress of the pavement structure. This paper analyzes the causes of damage caused by jointing glue under coupling field and the matters needing attention in selecting grouting glue material for pavement maintenance in the future.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414;U418.6

【参考文献】