隧道爆破振动下埋地长输油管道的管—土—油相互作用及振动特征

发布时间：2018-09-06 14:51

【摘要】：石油是重要的战略物质,更是经济社会稳定运转的润滑剂,管道运输是当下石油运送与调配的主要方式。随着国家基础设施建设的逐步推进,在隧道爆破施工中难免会对隧道邻近的输油管道产生爆破振动,给管道的安全性带来了很大的威胁。输油管道一旦因爆破振动而破裂,不仅造成大量的资源浪费,还会释放大量的有害物质污染环境,甚至还会引发火灾等次生灾害危及人民群众生命安全。因此,确保输油管道安全至关重要。西成客专仙女岩隧道在施工过程中会对隧道顶部的输油管道产生爆破振动,可能会危及输油管道的安全运营。本文以此工程背景为基础,利用LS-DYNA软件建立三维有限元模型进行数值模拟,将模拟计算结果与现场实测数据进行对比,验证了模型的准确性。本文主要分析管道、管周土体、地表土体以及石油的振动波形图,研究管、土、油三者的耦合关系,分析了不同爆心距和管道内压下的管道振速、地表土体振速以及管道的环向应力、轴向应力和当量应力,发现管道振速、地表土体振速以及管道当量应力均随着爆心距的增大而减小,随着管道内压的增大而增大。通过曲线拟合的方式得到函数关系式,为现场施工提供指导,节约施工成本,保障输油管道的安全运营。
[Abstract]:Oil is an important strategic material and a lubricant for the stable operation of economy and society. Pipeline transportation is the main way of oil transportation and distribution. With the gradual development of the national infrastructure construction, blasting vibration will inevitably occur in the tunnel blasting construction, which will bring a great threat to the safety of the pipeline. Once the pipeline breaks down due to blasting vibration, it will not only cause a lot of waste of resources, but also release a large amount of harmful substances to pollute the environment, and even cause secondary disasters such as fire to endanger the lives of the people. Therefore, it is very important to ensure the safety of oil pipeline. The blasting vibration of the oil pipeline at the top of the tunnel will be produced during the construction of Xicheng Guanghuanyan tunnel, which may endanger the safe operation of the pipeline. Based on the engineering background, a three-dimensional finite element model is established by using LS-DYNA software for numerical simulation. The accuracy of the model is verified by comparing the simulation results with the field measured data. This paper mainly analyzes the vibration waveform of pipeline, soil around pipe, surface soil and oil, studies the coupling relationship among pipe, soil and oil, and analyzes the vibration velocity of pipeline under different burst center distance and pipeline internal pressure. It is found that the vibration velocity of the pipeline, the soil vibration velocity and the equivalent stress of the pipeline decrease with the increase of the distance between the detonation centers, and increase with the increase of the internal pressure of the pipeline, as well as the circumferential stress, the axial stress and the equivalent stress of the pipe. The function relation is obtained by curve fitting, which provides guidance for field construction, saves construction cost and ensures safe operation of oil pipeline.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE88;U455.6

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