季节性冻土区埋地管道安全性分析

发布时间：2018-04-30 08:11

本文选题：埋地管道 + 弹性地基梁　；参考：《东北石油大学》2017年硕士论文

【摘要】：因为长距离输油管道周围的环境十分复杂,地理条件千差万别,因此在输油管道铺设和运营的过程中不可避免地会遇到各种各样的地质灾害区,而这些灾害区会给管线的长时间安全运营构成严重威胁。本文主要研究冻土冻胀作用下埋地管道的力学性能和地震与冻胀联合作用下的复杂荷载对埋地管道正常运营的影响。论文的主要研究内容及成果包括以下几个方面:(1)为及时了解冻土区管道运营期间结构受力性状的变化,本文利用铁木辛柯《材料力学》中有关弹性地基梁的基本解答,得到了在土体发生不均匀冻胀情况下埋地管线轴向应力与位移沿管线轴向变化的相关解答。(2)通过查阅文献及理论研究,应用有限元软件ADINA建立了三维管土温度场模型,模拟了埋地管道温度场的分布,并与文献记录中的实测地温进行了比对。(3)应用有限元软件ADINA建立了三维管土实体结构模型,通过对埋地管道进行热力耦合分析,计算了土体发生冻胀后管道的冻胀力,分析了温度、管道埋深、过渡段长度、管道内压、冻胀段长度等因素对冻土区埋地管道力学性能的影响,确定了管道受力最大的位置。(4)在土体发生冻胀的基础上施加地震作用,分析地震作用与土体冻胀组合形成的复杂荷载对埋地管道结构的影响,分析了温度、管道埋深、过渡段长度、管道内压、冻胀段长度等因素的影响,为埋地管线在复杂荷载作用下的研究提供一些参考。
[Abstract]:Because the environment around the long-distance oil pipeline is very complex and the geographical conditions vary widely, it is inevitable that various geological disaster areas will be encountered in the course of laying and operating the pipeline. These disaster areas pose a serious threat to the long-term safe operation of pipelines. In this paper, the mechanical properties of buried pipelines under frost heaving and the influence of complex loads under the combined action of earthquake and frost heave on the normal operation of buried pipelines are studied. The main research contents and results of this paper include the following aspects: 1) in order to understand the change of structural mechanical behavior during pipeline operation in frozen soil area, the basic solution of elastic foundation beam in Timuxinko "Mechanics of Materials" is used in this paper. The solution of axial stress and displacement variation along the pipeline axis under the condition of uneven frost heaving is obtained. By consulting the literature and theoretical research, the three-dimensional temperature field model of pipe and soil is established by using the finite element software ADINA. The distribution of temperature field of buried pipeline is simulated, and compared with the measured ground temperature in the literature. The finite element software ADINA is used to set up a three-dimensional solid structure model of pipe and soil, and the thermodynamic coupling analysis of buried pipeline is carried out. The influence of temperature, buried depth of pipeline, length of transition section, internal pressure of pipeline and length of frost heaving section on the mechanical properties of buried pipeline in frozen soil are analyzed. The maximum position of pipeline force is determined. (4) earthquake action is applied on the basis of soil frost heave. The influence of complex load formed by earthquake action and soil frost heaving on buried pipeline structure is analyzed, and the temperature and buried depth of pipeline are analyzed. The influence of the factors such as the length of the transition section, the internal pressure of the pipeline and the length of the frost-heave section provides some references for the study of buried pipeline under complex loads.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE88

【参考文献】