车辆荷载作用下道路—软土地基结构体系动态响应分析
发布时间：2018-08-31 20:59
【摘要】：伴随着众多工后问题的出现，交通荷载对道路各结构层的动态响应研究已经成为工程界特别关注的问题之一，也是学术界一直以来重点研究课题。经济的发展、出行率的提高、生活节奏的加快使修筑于软土路基上的高速公路越来越多，与此同时出现的工后问题也备受关注。介于软土压缩性高且强度低的特点以及交通荷载的动态性和长期性，加大了交通荷载作用下对道路动态响应研究的难度，并且路基与地基是协同工作、共同影响的有机整体，在交通荷载作用下的共同变形特性也是一个值得去探究的问题。 考虑到软土压缩性高且强度低的特点以及交通荷载的动态性和长期性，现行的假设路基为线弹性多层体系以及将交通荷载等效为静载的理论缺乏一定的说服力，，与实际工况相差较远。因此，对交通荷载的研究迫切从静态过渡到动态，土基、地基采用弹塑性模型显得更复合实际情况。 本文主要分为以下五部分内容： 本文首先根据实际工程案例提出本文研究的目的及意义，从理论研究进展、现场试验进展、数值分析进展三方面介绍了目前交通荷载对道路作用的研究现状。 第二部分接着介绍了数值计算的理论基础，首先简单描述了软土、路面材料的动力特性，阐述了适合软土体材料的本构模型，然后介绍了交通荷载的特性并确定了合适的简化模型。 第三部分根据已有的数值计算的理论基础，以典型软土地基各结构层为例，建立道路三维模型.本文采用双层地基模型模拟加固处理后理后的软土地基，面层、基层采用线弹性本构关系，土基及复合地基采用弹塑性本构关系，应用有限元软件编制有限元分析程序，采用三维动力有限元单元法对道路及复合地基在交通荷载作用下进行瞬态分析。 第四部分从单双车道车辆荷载为切入点，对比分析单独车辆荷载行驶时对道路结构体系的影响与双车道车辆荷载行驶时对道路结构体系影响的差别，对比分析车辆荷载作用对道路动态响应的叠加效应。 第五部分针对目前道路病害产生的主要原因，以单独车辆荷载作用为前提，从行车速度、车辆超载率这两方面研究了车辆荷载对道路及复合地基各结构层动力响应规律。
[Abstract]:With the emergence of many post-work problems, the study of the dynamic response of traffic load to each layer of road structure has become one of the issues of special concern in the engineering field, and has always been a key research topic in academic circles. With the development of economy, the increase of travel rate and the quickening of life rhythm, more and more highways are built on soft soil roadbed. Between the characteristics of high compressibility and low strength of soft soil and the dynamic and long-term nature of traffic load, it is more difficult to study the dynamic response of road under traffic load, and the roadbed and foundation work together as an organic whole. The characteristics of common deformation under traffic load is also a problem worth exploring. Considering the characteristics of high compressibility and low strength of soft soil and the dynamic and long-term nature of traffic load, the theory that the roadbed is assumed to be a linear elastic multistory system and traffic load is equivalent to static load is not convincing enough. It is far from the actual working condition. Therefore, the study of traffic load is urgent from static to dynamic. The elastoplastic model of soil foundation and foundation is more complex. This paper is divided into the following five parts: firstly, according to the actual engineering cases, this paper puts forward the purpose and significance of this study, from the theoretical research progress, field test progress, The research status of traffic load on road is introduced in three aspects. In the second part, the theoretical basis of numerical calculation is introduced. Firstly, the dynamic characteristics of soft soil and pavement materials are briefly described, and the constitutive model suitable for soft soil material is described. Then the characteristics of traffic load are introduced and a suitable simplified model is determined. In the third part, according to the theoretical foundation of numerical calculation, the 3D model of road is established by taking the typical soft soil foundation as an example. In this paper, the model of double layer foundation is used to simulate the linear elastic constitutive relation of the soft soil foundation, the surface layer and the base course, the elastoplastic constitutive relation of the soil foundation and the composite foundation is simulated, and the finite element analysis program is compiled by using the finite element software. The transient analysis of road and composite foundation under traffic load is carried out by using three dimensional dynamic finite element method. In the fourth part, from the point of view of single and double lane vehicle load, the influence of single vehicle load on road structure system is compared with that of dual lane vehicle load on road structure system. The superposition effect of vehicle load on road dynamic response is analyzed. In the fifth part, according to the main causes of road disease at present, the dynamic response law of vehicle load to each structure layer of road and composite foundation is studied from two aspects of driving speed and vehicle overload ratio, based on the premise of single vehicle load.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
本文编号：2216144
[Abstract]:With the emergence of many post-work problems, the study of the dynamic response of traffic load to each layer of road structure has become one of the issues of special concern in the engineering field, and has always been a key research topic in academic circles. With the development of economy, the increase of travel rate and the quickening of life rhythm, more and more highways are built on soft soil roadbed. Between the characteristics of high compressibility and low strength of soft soil and the dynamic and long-term nature of traffic load, it is more difficult to study the dynamic response of road under traffic load, and the roadbed and foundation work together as an organic whole. The characteristics of common deformation under traffic load is also a problem worth exploring. Considering the characteristics of high compressibility and low strength of soft soil and the dynamic and long-term nature of traffic load, the theory that the roadbed is assumed to be a linear elastic multistory system and traffic load is equivalent to static load is not convincing enough. It is far from the actual working condition. Therefore, the study of traffic load is urgent from static to dynamic. The elastoplastic model of soil foundation and foundation is more complex. This paper is divided into the following five parts: firstly, according to the actual engineering cases, this paper puts forward the purpose and significance of this study, from the theoretical research progress, field test progress, The research status of traffic load on road is introduced in three aspects. In the second part, the theoretical basis of numerical calculation is introduced. Firstly, the dynamic characteristics of soft soil and pavement materials are briefly described, and the constitutive model suitable for soft soil material is described. Then the characteristics of traffic load are introduced and a suitable simplified model is determined. In the third part, according to the theoretical foundation of numerical calculation, the 3D model of road is established by taking the typical soft soil foundation as an example. In this paper, the model of double layer foundation is used to simulate the linear elastic constitutive relation of the soft soil foundation, the surface layer and the base course, the elastoplastic constitutive relation of the soil foundation and the composite foundation is simulated, and the finite element analysis program is compiled by using the finite element software. The transient analysis of road and composite foundation under traffic load is carried out by using three dimensional dynamic finite element method. In the fourth part, from the point of view of single and double lane vehicle load, the influence of single vehicle load on road structure system is compared with that of dual lane vehicle load on road structure system. The superposition effect of vehicle load on road dynamic response is analyzed. In the fifth part, according to the main causes of road disease at present, the dynamic response law of vehicle load to each structure layer of road and composite foundation is studied from two aspects of driving speed and vehicle overload ratio, based on the premise of single vehicle load.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
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