地震载荷作用下跨断层埋地管道安全可靠性研究

发布时间：2018-06-30 03:42

本文选题：长输管道 + 安全可靠性　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：我国地质灾害多发,管道作为生命线工程的重要组成部分不可避免会穿越强震区、活动断层区等典型地质灾害区,导致管道过量变形而失效破坏,造成重大的经济损失和人员伤亡。因此,研究地震载荷作用下跨断层埋地管道的安全可靠性对于保障管道的正常运行具有重要意义。在综合分析前人相关研究的基础上,基于应变设计方法,研究了地震波和活动断层对埋地管道造成的影响,讨论了影响管道安全运行的因素,主要做了以下几方面的工作:归纳总结了国内外有关管道的应变设计准则,分析了埋地管道在典型不良地质条件下的失效模式以及在不同失效模式下的安全评定准则。介绍了目前广泛应用的埋地管道在地震波作用下的应变计算方法。分析了场地条件、管道几何参数、内压和温差等因素对管道轴向应变的影响。利用有限元软件对新粤浙管道跨越益店-乾县-美原断裂带的管土耦合模型进行了实例计算和应变校核,并研究了管径、壁厚、埋深、断层错距、土壤内摩擦角对跨越管道受力和变形的影响情况。其中,埋深、断层错距、土壤内摩擦角与管道轴向应变呈正相关关系;管径、壁厚与埋地管道轴向应变呈负相关关系。其次,通过地震波的输入,采用时程分析法对跨断层埋地管道在不同地震烈度、场地条件、管道几何参数下埋地管道的最大位移、最大形变量的变化规律进行了分析。研究了各随机变量对地震载荷作用下跨断层埋地管道安全可靠度的影响程度,建议现场设计施工时应尽量避开大位错活动断层带,选择大口径、厚壁钢管并浅埋在土壤相对密实的区域,以增加基于应变设计的管道的可靠度,使管道在满足可靠度要求的前提下减低成本,为地震波作用下穿跨越活动断层的长输管道的安全设计提供依据。
[Abstract]:There are many geological disasters in China. As an important part of the lifeline engineering, pipelines will inevitably pass through strong earthquake zones, active fault zones and other typical geological disaster areas, resulting in excessive pipeline deformation and failure, causing significant economic losses and casualties. Therefore, the safety and reliability of buried pipelines across fault under earthquake load are studied. It is of great significance to ensure the normal operation of pipeline. Based on the comprehensive analysis of previous research, the influence of seismic wave and active fault on buried pipeline is studied based on the strain design method, and the factors affecting the safe operation of the pipeline are discussed. The main work is done in the following aspects: induction and summary at home and abroad The failure modes of buried pipelines under typical adverse geological conditions and safety assessment criteria under different failure modes are analyzed. The strain calculation methods of buried pipelines under seismic waves are introduced, and the factors such as site strip, pipe geometry, internal pressure and temperature difference are analyzed. The finite element software is used to calculate the tube soil coupling model of the Xinyue and Zhejiang Qianxian County - Mei Yuan fault zone by finite element software. The effect of pipe diameter, wall thickness, buried depth, fault error and soil friction angle on the force and deformation of the crossing pipeline is studied. There is a positive correlation between the friction angle of the soil and the axial strain of the pipeline; the pipe diameter and the wall thickness have a negative correlation with the axial strain of the buried pipeline. Secondly, by the input of the seismic wave, the maximum displacement and the maximum shape of buried pipeline under different seismic intensity, site condition and pipe parameters are adopted by the time history analysis method. The influence degree of each random variable on the safety reliability of buried pipeline crossing the fault under the earthquake load is studied. It is suggested that the site design and construction should avoid the fault zone of the large dislocation, select the large diameter, thick wall steel pipe and be shallow in the relatively dense area of the soil, so as to increase the pipeline based on the strain design. The reliability of the pipeline makes the pipeline reduce the cost under the premise of satisfying the reliability requirements, and provides the basis for the safety design of the long transmission pipeline crossing the active fault under the action of seismic waves.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U179.8

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