双绞合钢丝网加筋沥青加铺层合理层位研究

发布时间：2018-06-14 17:37

本文选题：沥青路面 + 双绞合钢丝网　；参考：《湖南大学》2015年硕士论文

【摘要】：公路是国民经济发展的动脉,沥青混凝土路面是当前高等级路面的主要形式。当路面结构损坏达到一定程度或者最小可接受水平时,就需要通过改造或者大修来提高路面的服务水平,除条件受限必须采取路面翻修的情况外,常采用的改造措施就是沥青加铺技术。双绞合钢丝网作为一种新型的加筋材料,加筋沥青加铺层中能够有效的减少和延缓裂缝的出现,提高路面高温抗车辙能力,减薄沥青层厚度。本文简要介绍了双绞合钢丝网的材料特性,采用三维线性八节点减缩积分单元(C3D8R)模拟加铺层路面,双绞合钢丝网采用等效的方式将其等效为一定厚度的弹性复合材料,选择合适的计算参数,对双绞合钢丝网加筋层位进行研究,主要内容有:(1)钢丝网位于加铺层层底时,通过对荷载大小、加铺层厚度、加铺层模量、旧路模量以及水平力系数的改变来对加铺层层底主应力、层底剪应力,钢丝网拉应力、钢丝网与路面的层间力进行分析,得出以上因素对路面中各参数的影响规律。(2)分别考虑旧路有逢和无缝时,通过分析钢丝网在不同加筋层位,中置式和双置式的路表弯沉、上加铺层层底与整个加铺层层底主应力和剪应力的变化,确定了考虑不同功能的合理加筋位置。(3)建立温度荷载作用下的双绞合钢丝网加筋模型,对不同层位双绞合钢丝网加筋进行温度应力分析,确定双绞合钢丝网在温度应力作用下的合理加筋层位。
[Abstract]:Highway is the artery of national economic development, asphalt concrete pavement is the main form of high-grade pavement. When the pavement structure is damaged to a certain extent or the minimum acceptable level, it is necessary to improve the service level of the pavement by means of modification or overhaul, except in the case of limited conditions where the pavement must be renovated, Asphalt overlay technology is often adopted. As a new reinforced material, twisted wire mesh can effectively reduce and delay the appearance of cracks in the reinforced asphalt overlay, improve the rutting resistance of pavement at high temperature and reduce the thickness of asphalt layer. In this paper, the material characteristics of twisting wire mesh are briefly introduced. The three dimensional linear eight node reduction integral unit (C3D8R) is used to simulate the overlay pavement, and the twisted wire mesh is equivalent to elastic composite material of a certain thickness by means of equivalent method. Selecting the appropriate calculation parameters, the reinforced layer of twin-stranded wire mesh is studied. The main contents are as follows: when the wire mesh is located at the bottom of the overlay, the load size, the thickness of the overlay, the modulus of the overlay are analyzed. The changes of the old road modulus and the horizontal force coefficient are used to analyze the main stress, the bottom shear stress, the wire mesh tension stress, the interlayer force between the steel wire mesh and the road surface. It is concluded that the above factors affect the parameters of the pavement. (2) considering the existing road with seamless and intersecting, by analyzing the deflection of the road surface with different stiffened layers, middle type and double type, the steel wire mesh is used in the road surface of different reinforcement layer, middle type and double position. According to the change of principal stress and shear stress of the top layer bottom and the whole layer bottom, the reasonable reinforcement position of different functions is determined. (3) the double stranded wire mesh reinforcement model under the action of temperature load is established. The temperature stress analysis of twin-stranded wire mesh reinforced with different layers is carried out to determine the reasonable reinforcement layer of twisting steel wire mesh under the action of temperature stress.
【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】：U416.2

【参考文献】