交通荷载作用下埋地管道变形特性研究

发布时间：2018-03-16 20:51

本文选题：交通荷载　切入点：埋地管道　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着城市化进程的不断加快,交通和市政公用工程发展突飞猛进,埋地管道的应用越来越广泛。由于受到地理位置以及工程实际的限制,大多数管道都是埋设在地下的。埋地管道一方面受到其上方的土体作用,另外也受到来自路面的交通荷载、地面堆载以及管道内部流体冲击作用。由于这些作用的存在,管道会产生横向以及纵向的弯曲变形,这种弯曲变形会导致管道出现破损,进而造成管道渗漏,甚至爆管等情况。实际工程中的长管道是由多节短管道连接而成,管节部位是其最易发生破损的部位。本文通过对交通荷载下管道管节处应力变形特性的研究,来找出不同因素对管道管节应力变形的影响。通过研究得出了一些对埋地管道设计以及施工、防护措施等可参考的结论,主要研究内容和工作包括:1、针对我国目前埋地管道现状和未来发展趋势进行了分析,讨论了交通荷载对管道的危害,总结了目前国内外学者对埋地管道的研究。2、分别就埋地管道所需的交通荷载模型、管道模型、土体模型、管土相互作用模型进行探讨,选择较为合理的模型,并从理论上解释其合理性,为建立正确的有限元模型提供理论基础。3、运用ABAQUS大型有限元模拟软件对集中静载以及冲击荷载作用下埋地管道力学响应进行了计算。分别研究了集中静载以及冲击荷载作用下荷载大小、作用位置、土体模量以及管道埋深四种不同因素对管道力学性状的影响,找出不同工况下管道整体以及管道管节应力变形规律。4、通过对郑州市老旧污水管道检测项目以及广州市供水网管节封堵项目的研究分析,验证了在实际工程中管节是管道最易发生破坏的位置。针对管节处的破坏,通过现场试验以及工程实例,提出保护管道管节的一种新型措施。
[Abstract]:With the acceleration of urbanization, traffic and municipal utilities are developing by leaps and bounds, and the application of buried pipelines is becoming more and more extensive. Most of the pipelines are buried underground. Buried pipelines are affected not only by the soil above them, but also by the traffic load from the road, the surcharge on the ground, and the fluid impact inside the pipeline. The pipeline will produce transverse and longitudinal bending deformation, which will lead to pipeline breakage, which will lead to pipe leakage, even pipe burst. In actual engineering, long pipe is connected by multi-section and short pipeline. In this paper, the stress and deformation characteristics of pipe joints under traffic load are studied. In order to find out the influence of different factors on the stress and deformation of pipe joints, some conclusions for reference to the design, construction and protection measures of buried pipeline are obtained through the research. The main research contents and work include: 1. According to the present situation and future development trend of buried pipeline in China, the harm of traffic load to pipeline is discussed. This paper summarizes the domestic and foreign scholars' research on buried pipeline at present, discusses the traffic load model, pipeline model, soil model and pipe-soil interaction model respectively, and selects the more reasonable model. And explain its rationality theoretically, In order to establish the correct finite element model, the mechanical response of buried pipeline under concentrated static load and impact load is calculated by using ABAQUS software. The concentrated static load and the impact load are studied respectively. Load size under impact load, The influence of four different factors, such as the position of action, the modulus of soil and the buried depth of pipeline, on the mechanical properties of pipeline, Find out the stress and deformation law of the whole pipeline and pipe joint under different working conditions. Through the research and analysis of the old sewage pipeline inspection project in Zhengzhou and the water supply network section sealing project in Guangzhou, It is verified that pipe section is the most vulnerable site for pipeline failure in practical engineering. A new method to protect pipe joint is put forward through field test and engineering example.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU990.3

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