广东武深高速公路沥青路面结构设计研究

发布时间：2018-03-26 14:24

  本文选题：武深高速　切入点：路面结构设计　出处：《交通运输部公路科学研究院》2015年硕士论文

【摘要】：本文结合武深高速仁化至新丰段A1标段设计项目(以下称“设计项目”),针对路面结构的设计参数进行研究分析。路面结构的设计参数包括结构参数和性能参数。结构参数包括交通量以及交通荷载参数,路面结构温度场参数,路面结构层材料的抗压回弹模量以及劈裂强度。性能参数有:原材料技术参数、沥青混合料水稳定性、高温抗车辙能力、低温抗裂能力、抗渗水性能以及抗滑性能(适应于表面层)等。结合设计项目初步设计阶段拟定路面结构形式,通过调查分析和试验获取以上结构和性能设计参数,同时验证原材料以及混合料在仁化地区的适用性,最后经过结构层组合功能分析以及力学计算确定路面结构形式和各结构层厚度。通过现场对仁化地区及周围已建高速公路调查分析,获取拟建路面结构温度场情况。通过对车辆交通查分析,获取设计项目的交通量水平以及交通荷载情况并且确定路面结构交通等级。通过现场调查,获取设计项目高速公路建设原材料品质以及材料的供应情况。同时,经过对原材料的技术参数试验表明:SBS(I-D)改性沥青动力黏度伴随温度增减呈现指数关系的增减。为使沥青混合料满足仁化地区高温、多雨、重载交通的特点,沥青混合料必须满足均匀密水、高温抗车辙、低温抗裂和抗滑性能要求。选择SAC和改进型级配GAC两种级配,分别进行配合比设计,以及高温稳定性、抗水损性能、低温抗裂性,抗滑性能(表面层)和渗水性能(表面层)试验。鉴于GAC沥青混合料的水稳定性能较好,广东地区应用广泛,而且较SAC沥青混合料经济。因此选择GAC级配沥青混合料进行下一步试验研究。首先,分别采用国内轮碾试验和APA沥青路面分析仪对GAC-20C沥青混合料进行车辙试验。当使用动稳定作为评价抗车辙标准时,两种实验方法具有良好的相关性。并得到其动稳定度随温度升高,荷载增加以及沥青动力黏度下降,而呈现非线性的下降。同时总结国内现有的沥青混凝土的动稳定度水平,确定基于高抗车辙的沥青混合料动稳定度为4500次/mm,试验温度标准为65℃。选取55℃情况下浸水车辙动稳定度与干法车辙动稳定度车辙的残余率,作为沥青混合料抗水损的标准。同时考虑其他路用性能因素,将残余动稳定度指标选定为70%。总结研究国内构造深度水平,以及本项目采用材料实现水平,选取沥青混合料构造深度为0.7mm,作为设计指标。根据试验结果得到沥青路面结构的结构设计参数,结构层功能要求,以及项目需求,确定结构层组合以及结构层厚度。
[Abstract]:In this paper, the design parameters of pavement structure are studied and analyzed according to the A1 segment design project of Wu-Shen Expressway from Renhua to Xinfeng Section (hereinafter referred to as "Design Project"). The design parameters of pavement structure include structural parameters and performance parameters. Structural parameters include traffic volume and traffic load parameters, Temperature field parameters of pavement structure, compressive resilience modulus and splitting strength of pavement layer materials. Performance parameters include: technical parameters of raw materials, water stability of asphalt mixture, rutting resistance at high temperature, crack resistance at low temperature, Anti-seepage water performance and skid resistance (suitable for surface layer) etc. Combined with the preliminary design phase of the design project, the pavement structure form is drawn up, and the above structural and performance design parameters are obtained through investigation, analysis and test. At the same time verify the applicability of raw materials and mixtures in Renhua area, Finally, the pavement structure form and the thickness of each structure layer are determined by the combination function analysis of the structure layer and the mechanical calculation. The investigation and analysis of the highway built in and around Renhua area are carried out on the spot. Get the temperature field of the proposed pavement structure. Through the analysis of vehicle traffic, get the traffic level and traffic load of the design project and determine the traffic grade of the pavement structure. To obtain the quality of raw materials and the supply of materials for highway construction of the design project. At the same time, The experimental results on the technical parameters of raw materials show that the dynamic viscosity of modified asphalt increases or decreases with the increase or decrease of temperature. In order to make the asphalt mixture meet the characteristics of high temperature, much rain and heavy load traffic in Renhua area, The asphalt mixture must meet the requirements of uniform water density, high temperature rutting resistance, low temperature crack resistance and skid resistance. SAC and improved gradation GAC are selected for mix ratio design, as well as high temperature stability, water loss resistance and low temperature crack resistance. Tests on skid resistance (surface layer) and water permeability (surface layer). In view of the good water stability of GAC asphalt mixture, it has been widely used in Guangdong. Moreover, it is more economical than SAC asphalt mixture. Therefore, GAC graded asphalt mixture is selected for further test and research. First of all, The domestic wheel rolling test and APA asphalt pavement analyzer were used to test the rutting of GAC-20C asphalt mixture respectively. When dynamic stability was used as the criterion to evaluate rutting resistance, The results show that the dynamic stability increases with the increase of temperature, the dynamic viscosity of asphalt decreases and the dynamic stability of asphalt concrete decreases with the increase of temperature, and the dynamic stability of asphalt concrete in China is summarized at the same time. The dynamic stability of asphalt mixture based on high rutting resistance is determined to be 4500 times / mm and the test temperature standard is 65 鈩，

本文编号：1668225