软土地基上城市道路拓宽工程差异沉降控制技术研究

发布时间：2018-03-04 00:20

本文选题：道路拓宽　切入点：软土地基　出处：《广州大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着经济的发展和人民生活水平的提高,私家车数量越来越多,车流量也越来越大,使得原有道路不能满足现在交通运输量的增长和社会发展的现实需求,这就迫切需要对现有的道路进行改建和升级。道路的改建和升级主要包括道路的新建工程和改建工程,新建工程占用的土地资源多,投入也大,这不利于我国现在的发展趋势;而旧路改建工程不仅可以缓解土地使用的紧张程度,还可以起到节约资源和保护环境的作用,因此它将成为道路发展的趋势和需要。对于我国经济迅猛发展的沿海地区,旧路改建工程十分普遍。然而沿海地区相当一部分的道路都是建设在软土地基上,鉴于软土的工程特性,使旧路拓宽工程显得异常复杂。道路拓宽后路基差异沉降的控制是工程中所要解决的重要问题,主要有以下几个方面:(1)旧路路基自身的沉降已基本处于稳定状态,道路拓宽必会造成旧路基的附加沉降;(2)对新建道路下软基的处理必会造成新旧路基之间的差异沉降;(3)新旧道路路基和路面的结合部位能否保持整体的稳定性。本文针对道路拓宽工程中路基差异沉降控制所面临的问题进行了分析和研究。首先,通过查明研究区域内工程地质情况,对比分析了新老路基下地基土工程特性的变化,为分析计算和软土地基的处理提供依据;其次,对新老路基产生差异沉降的机理进行了分析,并运用有限元软件研究了不同影响因素下道路拓宽工程的沉降变化规律;最后,结合本工程分别从软土地基处理和路基路面结合处的处治两方面研究了路基差异沉降的控制技术,提出了适合软土地基上城市道路地基处理方法和结合处处治措施,为以后类似的工程项目提供有价值的参考和依据。
[Abstract]:With the development of economy and the improvement of people's living standard, the number of private cars is increasing and the traffic volume is increasing. There is an urgent need to rebuild and upgrade the existing roads. The reconstruction and upgrading of roads mainly include the new construction and reconstruction of roads. The new projects occupy a lot of land resources and invest a lot, which is not conducive to the current development trend of our country; The old road reconstruction project can not only alleviate the tension of land use, but also save resources and protect the environment. Therefore, it will become the trend and need of road development. Old road reconstruction works are very common. However, a large proportion of the roads in coastal areas are built on soft soil foundations, and in view of the engineering characteristics of soft soil, The control of the differential settlement of the roadbed after road widening is an important problem to be solved in the project, mainly in the following aspects: 1) the settlement of the old road subgrade has been basically in a stable state. The treatment of soft foundation under the new road will cause the differential settlement between the new and the old subgrade. 3) whether the joint part of the new and old road subgrade and pavement can maintain the overall stability. This paper analyzes and studies the problems of differential settlement control of roadbed in road widening project. By finding out the engineering geological conditions in the study area, the change of engineering characteristics of foundation soil under new and old subgrade is compared and analyzed, which provides the basis for analysis and calculation and treatment of soft soil foundation. Secondly, The mechanism of differential settlement of new and old roadbed is analyzed, and the law of settlement variation of road widening project under different influence factors is studied by using finite element software. Combined with this project, the paper studies the control technology of subgrade differential settlement from two aspects of soft foundation treatment and roadbed and pavement combination treatment, and puts forward the treatment method and treatment measures suitable for urban road foundation on soft soil foundation. To provide valuable reference and basis for similar projects in the future.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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