基于损伤理论的混凝土路面结构破坏机理研究
发布时间：2018-10-12 18:25
【摘要】：近年来,公路在我国的发展非常迅速,公路上车辆行驶速度快,交通流量大,超载情况普遍。因此公路对路面路基的要求严格。已超载车辆对路面的损伤成为路面损伤的因素之一,在车辆超载的作用下,路面的损伤破坏,成了工程界主要关注的问题。大量的研究表明,路面的受力过程往往伴随着损伤的发生,并且由于损伤力学在混凝土道路工程中的应用日益成熟,因此有必要在研究中引入混凝土的损伤模型以贴合工程实际。与此同时,基层表现为明显横观各向同性特征。综上两点本文同时考虑了路基的横观各向同性和路面的混凝土损伤特性对道路性能的影响。本文在已有研究成果的基础上,将弹性损伤理论和横观各向同性理论与有限元方法相结合,建立了路面结构的三维仿真模型,同时考虑路基横观各向同性和路面的混凝土损伤的路面结构在动力荷载作用下的损伤,并研究了损伤度与路面刚度以及结构厚度的关系以用于优化路面设计。本文的主要研究内容如下:1、选取典型的混凝土路面结构为研究对象,该结构将路面从上到下分为面层、基层、底基层和土基层。针对不同结构层的性质,研究贴合工程实际的本构关系,利用ABAQUS软件建立合理的三维有限元模型。2、混凝土路面的损伤破坏多数是因为车辆动力荷载造成的,故本文研究了交通荷载作用对路面造成的损伤以确定损伤发生位置以及损伤演化过程,研究表明,损伤位置以及损伤演化方向符合理论分析以及工程实际。3、本文首先通过比较不同超载量情况下的损伤因子,得出能够引起损伤的临界荷载。在此荷载基础上,改变不同结构层的结构刚度以及结构厚度,对得出的损伤因子进行分析比较,得出最优的路面结构,以用于指导路面设计。本文研究表明,各个结构参数的优化都可以改善路面的损伤破坏情况,其中面层厚度的变化对损伤因子的影响最为明显。在工程中为取得较好的经济效益,本文建议应首要考虑采取合理的面层厚度设计。
[Abstract]:In recent years, the development of highway in our country is very fast, the speed of vehicles on the highway is fast, the traffic flow is large, and the overloading situation is common. Therefore, the highway on the road roadbed strict requirements. The damage of overloaded vehicles to the pavement has become one of the factors of pavement damage. Under the action of vehicle overload, the damage of road surface has become the main concern of the engineering field. A large number of studies have shown that the stress process of pavement is often accompanied by the occurrence of damage, and the application of damage mechanics in concrete road engineering is becoming more and more mature. Therefore, it is necessary to introduce concrete damage model to fit the engineering practice. At the same time, the basic level is obviously transversely isotropic. In this paper, the influence of transversely isotropy of roadbed and concrete damage characteristics of pavement on road performance is considered. Based on the existing research results, a three-dimensional simulation model of pavement structure is established by combining elastic damage theory with transversely isotropic theory and finite element method. At the same time, the damage of pavement structure with transversely isotropic subgrade and concrete damage of pavement under dynamic load is considered, and the relationship between damage degree, pavement stiffness and structural thickness is studied to optimize pavement design. The main contents of this paper are as follows: 1. The typical concrete pavement structure is selected as the research object. The structure divides the pavement from top to bottom into surface layer, base course, bottom base and soil base. According to the properties of different structural layers, the actual constitutive relation of the fitting engineering is studied, and a reasonable three-dimensional finite element model is established by using ABAQUS software. 2. The damage and failure of concrete pavement are mostly caused by vehicle dynamic load. Therefore, this paper studies the damage caused by traffic load to determine the location and evolution of the damage. The damage location and the direction of damage evolution are in accordance with the theoretical analysis and engineering practice. 3. Firstly, by comparing the damage factors under different overloads, the critical load which can cause damage is obtained. On the basis of this load, the structural stiffness and thickness of different structural layers are changed, and the damage factors are analyzed and compared, and the optimal pavement structure is obtained to guide the pavement design. In this paper, it is shown that the optimization of structural parameters can improve the damage and failure of pavement, and the influence of the thickness of the surface layer on the damage factor is the most obvious. In order to obtain better economic benefit, this paper suggests that reasonable design of surface thickness should be taken into account.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2
本文编号：2267148
[Abstract]:In recent years, the development of highway in our country is very fast, the speed of vehicles on the highway is fast, the traffic flow is large, and the overloading situation is common. Therefore, the highway on the road roadbed strict requirements. The damage of overloaded vehicles to the pavement has become one of the factors of pavement damage. Under the action of vehicle overload, the damage of road surface has become the main concern of the engineering field. A large number of studies have shown that the stress process of pavement is often accompanied by the occurrence of damage, and the application of damage mechanics in concrete road engineering is becoming more and more mature. Therefore, it is necessary to introduce concrete damage model to fit the engineering practice. At the same time, the basic level is obviously transversely isotropic. In this paper, the influence of transversely isotropy of roadbed and concrete damage characteristics of pavement on road performance is considered. Based on the existing research results, a three-dimensional simulation model of pavement structure is established by combining elastic damage theory with transversely isotropic theory and finite element method. At the same time, the damage of pavement structure with transversely isotropic subgrade and concrete damage of pavement under dynamic load is considered, and the relationship between damage degree, pavement stiffness and structural thickness is studied to optimize pavement design. The main contents of this paper are as follows: 1. The typical concrete pavement structure is selected as the research object. The structure divides the pavement from top to bottom into surface layer, base course, bottom base and soil base. According to the properties of different structural layers, the actual constitutive relation of the fitting engineering is studied, and a reasonable three-dimensional finite element model is established by using ABAQUS software. 2. The damage and failure of concrete pavement are mostly caused by vehicle dynamic load. Therefore, this paper studies the damage caused by traffic load to determine the location and evolution of the damage. The damage location and the direction of damage evolution are in accordance with the theoretical analysis and engineering practice. 3. Firstly, by comparing the damage factors under different overloads, the critical load which can cause damage is obtained. On the basis of this load, the structural stiffness and thickness of different structural layers are changed, and the damage factors are analyzed and compared, and the optimal pavement structure is obtained to guide the pavement design. In this paper, it is shown that the optimization of structural parameters can improve the damage and failure of pavement, and the influence of the thickness of the surface layer on the damage factor is the most obvious. In order to obtain better economic benefit, this paper suggests that reasonable design of surface thickness should be taken into account.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2
【参考文献】
相关期刊论文 前3条
1 章根德,朱维耀;岩土介质横观各向同性的模拟[J];力学进展;1998年04期
2 胡海昌;在体积力作用下jk壚各向同性弹性体的平衡问题[J];物理学报;1955年03期
3 刘丽萍;黄义;李向阳;;板-复合地基动力分析半解析元法[J];岩土力学;2007年04期
相关硕士学位论文 前2条
1 聂彦锋;混凝土单轴拉伸下抗裂与损伤性能研究[D];河海大学;2007年
2 叶雯;基于损伤理论的横观各向同性层状路面结构破坏过程的数值模拟研究[D];西安建筑科技大学;2013年
，本文编号：2267148
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2267148.html
