爆破振动对近距输油管线影响规律研究

发布时间：2018-07-05 03:01

本文选题：爆破振动 + 输油管线　；参考：《中国矿业大学》2015年硕士论文

【摘要】：在隧道开挖掘进过程中,钻爆法是主要采用的施工方法之一。当城市近郊隧道工程采用钻爆法施工时,常常遇到爆破振动对于周边管线的影响问题。而管线作为特殊构筑物一旦因振动影响发生破坏会造成巨大的经济损失和社会影响。因此,研究爆破振动对于近距管线的影响规律,具有重要的理论和现实意义。本文运用应力波基本理论分析了应力波在介质中的传播与衰减以及在介质交界面处的反射、折射规律,并运用有限元模拟软件ANSYS/LS-DYNA,模拟了在爆炸作用下,不同炸药类型、不同单段最大起爆药量、不同管线与爆源距离、不同管线直径、不同管线壁厚以及不同管线埋深条件下管线的受爆破振动影响情况,得出:管线迎爆面中心质点的Y向振速最大;管线峰值振速随单段最大起爆药量的增加而增加,随管线与爆源间距离增加而减小,随管线直径的增加而增加,随管线壁厚的增加而增加,随管线埋深的增加而减小;管线沿地震波传播方向上振速大于垂直于地震波传播方向上振速,管线的存在对于沿地震波传播方向上的振速影响小于垂直于地震波纵波传播方向上的振速;同时,管线周围近距岩石最大振速因管线存在发生一定变化,岩石最大振速随与管线间距离增大而减小;根据理论分析与数值模拟研究结果,提出了隧道爆破施工时管线的相关保护措施。
[Abstract]:Drilling and blasting method is one of the main construction methods in tunnel excavation. When urban suburban tunnel works are constructed by drilling and blasting method, the influence of blasting vibration on the surrounding pipelines is often encountered. As a special structure, once the pipeline is damaged by vibration, it will cause huge economic loss and social impact. Therefore, it is of great theoretical and practical significance to study the influence of blasting vibration on short distance pipeline. In this paper, the basic theory of stress wave is used to analyze the propagation and attenuation of stress wave in the medium, as well as the law of reflection and refraction at the interface of the medium. The finite element simulation software ANSYS- LS-DYNA is used to simulate the different types of explosives under the action of explosion. Under different conditions, such as maximum detonation charge, distance between pipeline and detonation source, diameter of pipeline, wall thickness of pipeline and buried depth of pipeline, the vibration of pipeline is affected by blasting vibration. It is concluded that the Y-direction vibration velocity of the center particle of the pipeline faces the explosion is the largest, the peak vibration velocity of the pipeline increases with the increase of the maximum initial explosive quantity in a single section, decreases with the increase of the distance between the pipeline and the detonation source, and increases with the increase of the diameter of the pipeline. With the increase of the wall thickness of the pipeline and the decrease of the buried depth of the pipeline, the upward vibration velocity of the pipeline along the direction of seismic wave propagation is greater than that of the vertical direction of the seismic wave propagation. The influence of pipeline on the vibration velocity along the direction of seismic wave propagation is less than that perpendicular to the direction of longitudinal wave propagation of seismic wave, at the same time, the maximum vibration velocity of the near distance rock around the pipeline changes to some extent due to the existence of pipeline. The maximum vibration velocity of rock decreases with the increase of the distance between the pipeline and the pipeline. Based on the theoretical analysis and numerical simulation results, the protective measures for the pipeline in tunnel blasting construction are put forward.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973

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