撒哈拉以南非洲地区长寿命路面结构组合设计研究

发布时间：2018-01-02 04:24

  本文关键词：撒哈拉以南非洲地区长寿命路面结构组合设计研究　出处：《哈尔滨工业大学》2016年硕士论文　论文类型：学位论文

  更多相关文章： 长寿命沥青路面 结构组合 动力学响应

【摘要】：非洲全境约3000万km2,目前约7.6亿人口,在撒哈拉以南非洲地区,公路交通系统在交通运输中有重要的作用。作为一种交通基础设施,公路对于撒哈拉以南非洲地区的交通起着至关重要的作用。在所有的交通方式中,公路运输占的比重最大,承担了撒哈拉以南非洲地区80%~90%的城市间和国家间的货物运输。撒哈拉以南非洲地区的公路网密度低于4.2公里/平方公里,其中具有铺装的公路为16%。目前路况服务条件良好的占44%,服务条件中等的占22%、较差的占34%。所以撒哈拉以南非洲的道路系统处于较低水平,非洲公路的现状(道路老化、车辙损坏、破坏情况严重)并不能让人满意,已经成为了桎梏经济发展的重要因素,因此有必要设法解决这种问题。基于以上问题,本文对撒哈拉以南非洲地区长寿命路面结构组合设计进行了如下几个方面的研究:首先,通过查阅文献列举了撒哈拉以南非洲地区的路面结构现状及主要问题,对沥青路面的环境条件及交通状况、常见的病害类型进行了较详细的分析。其次,详细介绍了撒哈拉以南非洲最普遍的沥青路面结构设计方法。主要是根据现有规范总结了撒哈拉以南非洲地区高速公路沥青路面设计过程中重载车交通量、计算风险、沥青混合料计算参数取值、路面的承载等级、路面结构层的容许应变和实际应变的计算、路面结构各层的厚度验算以及典型路面结构方案的确定。然后,以撒哈拉以南非洲的沥青路面结构设计理论和方法为基础,结合欧美、中国等长寿命路面的设计理念、设计要求、设计标准,设计出全厚式沥青路面、半刚性结构路面、复合结构路面等三种较合理的路面组合形式。最后根据弹性层状体系理论,使用国际上通用大型有限元软件—ABAQUS对三种典型长寿命路面力学性能对比分析。对每种路面结构分别建立了两种三维有限元路面结构模型进行有限元分析,一种是在静载改为半正弦动荷载下进行不含裂缝路面结构的动力响应有限元分析,对比分析了三种结构力学响应的分布规律,及沥青层层底拉应变、基层底部拉应变和土基顶面压应变等指标的时程曲线变化规律;另一种是在移动均布荷载下进行表面含裂缝路面结构的断裂力学分析,研究不同沥青路面结构的裂缝扩展规律。
[Abstract]:With a population of about 30 million km2 across Africa and a population of about 760 million people, road transport systems play an important role in transport in sub-Saharan Africa as a transport infrastructure. Roads play a vital role in transport in sub-Saharan Africa, where road transport accounts for the largest share of all modes of transport. 80 / 90 per cent of inter-city and inter-country freight transport in sub-Saharan Africa. The road network in sub-Saharan Africa is less than 4.2 km / km2. The number of roads with pavement is 16. At present, 44% of the roads have good conditions of service, and 22% of them have medium service conditions. So the road system in sub-Saharan Africa is at a low level, and the current state of African roads (road aging, rutting damage, severe damage) is not satisfactory. Has become an important factor in the shackles of economic development, so it is necessary to try to solve this problem. Based on the above problems. In this paper, the combination design of long-life pavement structure in sub-Saharan Africa is studied in the following aspects: firstly, the paper enumerates the current situation and main problems of pavement structure in sub-Saharan Africa by consulting the literature. The environmental conditions and traffic conditions of asphalt pavement, common disease types are analyzed in detail. Secondly. The most common asphalt pavement structure design method in sub-Saharan Africa is introduced in detail. The traffic volume of heavy haul vehicles in the design process of highway asphalt pavement in sub-Saharan Africa is summarized according to the existing specifications. Calculation of risk, calculation of asphalt mixture calculation parameters, bearing grade of pavement, allowable strain of pavement structure layer and calculation of actual strain. The thickness of each layer of pavement structure and the determination of typical pavement structure. Then, based on the theory and method of asphalt pavement structure design in sub-Saharan Africa, combined with Europe and the United States. The design concept, design requirements and design standards of China's iso-long-life pavement are used to design the full-thickness asphalt pavement and semi-rigid pavement. There are three reasonable pavement combination forms such as composite structure pavement. Finally, according to the theory of elastic layered system. The mechanical properties of three typical long-lived pavements are compared and analyzed by using international large-scale finite element software-Abaqus. Two kinds of three-dimensional finite element pavement structure models are established for each pavement structure and finite element analysis is carried out for each kind of pavement structure. Analysis. One is the finite element analysis of the dynamic response of pavement structure without cracks under static load to half sinusoidal dynamic load. The distribution law of mechanical response of three structures and the tensile strain of asphalt layer bottom are compared and analyzed. The time history curves of the tensile strain at the base and the compressive strain at the top of the soil foundation; The other is to analyze the fracture mechanics of pavement structure with surface crack under moving uniform load, and to study the crack propagation law of different asphalt pavement structure.
【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】：2016
【分类号】：U416.2
，

本文编号：1367675