水泥混凝土路面沥青隔离层力学作用的数值分析

发布时间：2019-01-09 06:52

【摘要】：现行水泥混凝土路面设计中,很多地方采用了设置沥青隔离层(封层)的方式,防止雨水对基层的冲刷。实践表明:在多雨地区设置沥青隔离层,可以延长水泥混凝土路面的使用寿命,减少相应病害的产生。所以,针对水泥混凝土路面沥青隔离层力学作用的数值分析十分必要。本文结合实际路面结构,建立水泥混凝土路面的有限元三维结构模型,运用ABAQUS有限元软件对其进行计算分析。本文主要研究了水泥混凝土路面静力荷载应力分析、温度场应力分析和在移动荷载下的应力分析,并对沥青隔离层不同厚度和模量下的各种荷载和温度应力进行了具体的计算,得到以下主要研究结果:(1)根据静力荷载应力分析,水泥混凝土路面应力受沥青隔离层厚度和模量的影响较大,增加沥青隔离层可有效地缓解路面应力问题。(2)根据温度场应力分析,水泥混凝土路面的温度应力受沥青隔离层厚度和模量影响较小,但是增加沥青隔离层,对路面温度应力还是有所改善。沥青隔离层的温度应力虽然受沥青隔离层厚度影响较大,但是所受到的温度应力比较小,不会对沥青隔离层产生很大影响,可忽略不计。(3)根据耦合应力分析,水泥混凝土路面耦合应力受到沥青隔离层厚度和模量影响较小,并且增加沥青隔离层,对路面耦合应力还是有所改善。沥青隔离层的温度应力虽然受沥青隔离层厚度影响较大,但是所受到的耦合应力比较小,不会对沥青隔离层产生很大影响,可忽略不计。(4)根据动力响应分析,有无沥青隔离层,对水泥混凝土面层和水泥稳定碎石基层的受力影响较大。同时,车辆荷载的移动速度、沥青隔离层厚度和模量对于路面的动力作用效果明显。
[Abstract]:In the current design of cement concrete pavement, asphalt isolation layer (seal layer) is used in many places to prevent Rain Water from scouring the base course. The practice shows that setting asphalt isolation layer in rainy area can prolong the service life of cement concrete pavement and reduce the occurrence of corresponding diseases. Therefore, it is necessary to analyze the mechanical effect of asphalt isolation layer on cement concrete pavement. In this paper, the finite element three-dimensional structure model of cement concrete pavement is established, and the finite element software ABAQUS is used to calculate and analyze it. In this paper, the static load stress analysis, the temperature field stress analysis and the stress analysis under moving load of cement concrete pavement are studied, and the concrete calculation of various loads and temperature stresses under different thickness and modulus of asphalt isolation layer is carried out. The main results are as follows: (1) according to the static load stress analysis, the stress of cement concrete pavement is greatly affected by the thickness and modulus of asphalt isolation layer. (2) according to the temperature field stress analysis, the temperature stress of cement concrete pavement is less affected by the thickness and modulus of asphalt isolation layer, but increasing asphalt isolation layer, The temperature stress of road surface is improved. Although the temperature stress of asphalt isolation layer is greatly affected by the thickness of asphalt isolation layer, but the temperature stress is relatively small, it will not have a great effect on asphalt isolation layer, and can be ignored. (3) according to the coupling stress analysis, The coupling stress of cement concrete pavement is less affected by the thickness and modulus of asphalt isolation layer, and the coupling stress is improved by increasing asphalt isolation layer. Although the temperature stress of asphalt isolation layer is greatly affected by the thickness of asphalt isolation layer, but the coupling stress is relatively small, it will not have a great effect on asphalt isolation layer and can be ignored. (4) according to the dynamic response analysis, The influence of bitumen isolation on the stress of cement concrete surface and cement stabilized macadam base is great. At the same time, the moving speed of vehicle load, the thickness and modulus of asphalt isolation layer have obvious effect on the dynamic action of pavement.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.216

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