埋地管道黄土潜蚀水毁灾害及安全评估方法研究

发布时间：2018-09-06 19:49

【摘要】：管道运输是一种低成本、高效的运输方式,我国地质状况复杂,管线工程不可避免地要穿越某些特殊地段。黄土地区西气东输管道常年受到水毁灾害的侵扰,尤其是黄土潜蚀作用导致的埋地管道水毁,具有隐蔽性和突发性的特点,西气东输管道公司投入了大量的人力、物力,采取各类治理措施均不见成效。因此,对埋地管道黄土潜蚀水毁灾害及安全评估方法的研究具有重要意义。本文从黄土潜蚀作用出发,分析了黄土潜蚀作用与埋地管道水毁之间的关系,阐述了黄土潜蚀水毁灾害对埋地管道的危害形式以及灾害作用机理;借助探地雷达结合多种勘察手段对埋地管道黄土潜蚀水毁灾害进行调查。总结了灾害的分布规律及特点,总结了埋地管道黄土潜蚀水毁灾害的五种发展模式,详细阐述了灾害发展的四个过程。然后,通过ABAQUS软件建立管道模型,对各类工况条件下的管道状态进行了模拟分析,得到了管道的受力和变形状况,分析了在不同因素作用下管道应力、应变、位移的变化规律;比较了不同因素对管道状态的影响程度,并据此提出了相关的灾害防治建议;基于两种失效判据,对管道进行了失效分析。最后,基于突变理论建立了埋地管道黄土潜蚀水毁安全评估模型,提出了管道状况评估指标,并将该指标定量化引入评估模型;结合西气东输EA052灾害点勘探结果,建立了灾害点的有限元模型,将计算结果带入评估模型进行分析,得到灾害点的安全等级,为埋地管道黄土潜蚀水毁灾害的防治工作提供了理论依据。
[Abstract]:Pipeline transportation is a low cost and efficient transportation mode. The geological condition of our country is complex. Pipeline engineering inevitably has to pass through some special areas. The west to east gas pipeline in the loess area has been disturbed by the water damage disaster all the year round, especially the buried pipeline water damage caused by the loess latent erosion, which has the characteristics of concealment and sudden occurrence. The west to east gas pipeline company has invested a lot of manpower and material resources. All kinds of governance measures have not been effective. Therefore, it is of great significance to study the hidden erosion and water damage disaster and safety assessment method of buried pipeline loess. Based on the latent erosion of loess, this paper analyzes the relationship between the latent erosion of loess and the water damage of buried pipeline, and expounds the damage form and mechanism of the hidden erosion of loess to buried pipeline. By means of ground penetrating radar (GPR) combined with many kinds of prospecting methods, the buried pipeline loess latent erosion and water damage disaster is investigated. This paper summarizes the distribution law and characteristics of disasters, summarizes five development models of buried pipeline loess latent erosion and water damage, and expounds in detail the four processes of disaster development. Then, the pipeline model is established by ABAQUS software, the pipeline state under various working conditions is simulated and analyzed, the stress and deformation of the pipeline are obtained, and the variation law of the stress, strain and displacement of the pipeline under the action of different factors are analyzed. The degree of influence of different factors on pipeline state is compared, and relevant disaster prevention suggestions are put forward. Based on two failure criteria, failure analysis of pipeline is carried out. Finally, based on the catastrophe theory, the safety assessment model of buried pipeline loess subsurface erosion and water damage is established, and the evaluation index of pipeline condition is put forward, and the quantitative index is introduced into the evaluation model, and combined with the exploration results of EA052 disaster point of gas transmission from west to east, The finite element model of the disaster point is established, and the calculation results are brought into the evaluation model to analyze the safety grade of the disaster point, which provides a theoretical basis for the prevention and control of the buried pipeline loess latent erosion and water damage.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE88

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