地震作用下埋地供水管道土—管—水耦合动力学模型研究
发布时间：2018-12-19 10:03
【摘要】：城市生命线工程的主要组成部分埋地供水管道,关系着人们的日常生产生活的质量。而我国处在地震带上地震频发。在地震激励下,埋地供水管道发生破坏,并衍生地震次生灾害,对人们的生命财产造成严重威胁。因此提高埋地供水管道的抗震性能,保证供水管道的正常运行,具有很高的理论研究价值和极大的现实意义。本文在管-工作用模型和管-液流固耦合模型的基础上,对地震作用下埋地供水管道土-管-水的耦合作用动力学模型深入研究,并进行ADINA数值模拟验证研究的可靠性。本文的主要研究内容和分析结果如下:1、忽略管道中水的作用,考虑地震作用下埋地管道管-工作用,推导了地震作用下埋地管道的动力学模型轴向应力计算式;忽略埋地供水管道中土体对管道的作用,用行波的方法考虑地震作用下供水管道的流固耦合作用,推导出地震作用下供水管道的流固耦合动力学模型轴向应力计算式;在地震作用下埋地管道的动力学模型、地震作用下供水管道的流固耦合动力学模型的基础上,用行波的方法研究了地震作用下埋地供水管道土-管-水耦合作用,创造性地提出了地震作用下埋地供水管道土-管-水耦合动力学模型轴向应力计算式。2、用ADINA有限元软件建立地震作用下埋地管道管-土模型,并计算了管-土模型在不同管径、壁厚、埋置深度情况下的管道轴向应力。在此管-土模型中,当地震波的地震烈度为Ⅷ度时,管道轴向应力随着管径的增大而增大,管径为1400mm时其轴向应力较管径600mm时的轴向应力增大23.16%;管-土模型中管道轴向应力随着壁厚增加而减小,管道壁厚为5mm时其轴向应力较壁厚为25mm时大35.77%;随着管道埋置深度的加深,管道所受的轴向应力先增大后减小,管道的轴向应力在埋深为2m和3m时达到最大,为2.85MPa。3、用ADINA有限元软件建立地震下埋地供水管道土-管-水模型,并计算了土-管-水模型在不同管径、壁厚、埋置深度情况下管道轴向应力。发现土-管-水模型的轴向应力变化规律与管-土模型的轴向应力变化规律基本一致。在此土-管-水模型中,当地震波的地震烈度为Ⅷ度时,管道轴向应力随着管径的增大而增大,轴向应力从管径为600mm的3.01MPa增大到管径为1400mm的4.00MPa;随着管-土模型的壁厚增加,管道所受的轴向应力逐渐减小,轴向应力从壁厚为5mm的3.53MPa减小到壁厚为25mm的2.78MPa;管道的轴向应力随着埋置深度的增大而逐渐增大,轴向应力从埋深为0.5m的2.84MPa增大到埋深为4m的3.19MPa。4、对比地震作用下管-土模型与地震作用下土-管-水模型计算结果,发现不同管径、壁厚、埋置深度情况下土-管-水模型的轴向应力要大于管-土模型的轴向应力。管-土模型中管道轴向应力波动比较严重,而土-管-水模型中管道的轴向应力随着地震的变化比较平缓。5、结合工程实例,发现在抗震设计中,用管-土模型进行管道轴向应力设计结果比用土-管-水模型设计结果小,因此在抗震设计中不能忽略地震中动水压力的影响。本文所得结论可为分析土-管-水耦合作用的埋地供水管道结构的伤损机理和伤损发展机制提供理论基础,以供解决埋地供水管道安全运营中与地震灾害有关的理论问题。
[Abstract]:The main part of the urban lifeline project is the water supply pipeline, which is related to the quality of daily production and life of people. And our country is on the seismic belt with frequent earthquakes. Under the earthquake excitation, the buried water supply pipeline is damaged, and the secondary disasters of the earthquake are derived, which pose a serious threat to people's lives and property. so that the anti-seismic performance of the buried water supply pipeline is improved, the normal operation of the water supply pipeline is guaranteed, and the water supply pipeline has high theoretical research value and great practical significance. On the basis of the pipe-working model and the pipe-liquid-liquid-solid coupling model, the coupling dynamic model of the earth-pipe-water of the buried water supply pipe under the action of the earthquake is studied deeply, and the reliability of the ADINA numerical simulation and verification research is carried out. The main research contents and the analysis results of this paper are as follows: 1. The function of water in the pipeline is neglected, and the pipe-work is buried under the action of the earthquake. The axial stress calculation formula of the dynamic model of the buried pipeline under the action of the earthquake is derived; the effect of the soil on the pipeline in the buried water supply pipeline is ignored, In the method of traveling wave, the flow-solid coupling effect of the water supply pipeline under the action of the earthquake is considered, the axial stress calculation formula of the flow-solid coupling dynamic model of the water supply pipeline under the earthquake action is derived, and the dynamic model of the buried pipeline under the action of the earthquake is obtained, On the basis of the hydrodynamic model of the flow-solid coupling of the water supply pipeline under the action of the earthquake, the soil-pipe-water coupling effect of the buried water supply pipe under the action of the earthquake is studied by the method of traveling wave. In this paper, the axial stress calculation formula of the earth-pipe-water coupling dynamic model of the buried water supply pipe under the action of earthquake is put forward in this paper. The pipe-soil model of the buried pipeline under the action of earthquake is established by using the ADINA finite element software, and the pipe-soil model is calculated in different pipe diameters and wall thickness. The axial stress of the pipe in the case of a buried depth. In this pipe-soil model, when the seismic intensity of the seismic wave is 鈪，
本文编号：2386769
[Abstract]:The main part of the urban lifeline project is the water supply pipeline, which is related to the quality of daily production and life of people. And our country is on the seismic belt with frequent earthquakes. Under the earthquake excitation, the buried water supply pipeline is damaged, and the secondary disasters of the earthquake are derived, which pose a serious threat to people's lives and property. so that the anti-seismic performance of the buried water supply pipeline is improved, the normal operation of the water supply pipeline is guaranteed, and the water supply pipeline has high theoretical research value and great practical significance. On the basis of the pipe-working model and the pipe-liquid-liquid-solid coupling model, the coupling dynamic model of the earth-pipe-water of the buried water supply pipe under the action of the earthquake is studied deeply, and the reliability of the ADINA numerical simulation and verification research is carried out. The main research contents and the analysis results of this paper are as follows: 1. The function of water in the pipeline is neglected, and the pipe-work is buried under the action of the earthquake. The axial stress calculation formula of the dynamic model of the buried pipeline under the action of the earthquake is derived; the effect of the soil on the pipeline in the buried water supply pipeline is ignored, In the method of traveling wave, the flow-solid coupling effect of the water supply pipeline under the action of the earthquake is considered, the axial stress calculation formula of the flow-solid coupling dynamic model of the water supply pipeline under the earthquake action is derived, and the dynamic model of the buried pipeline under the action of the earthquake is obtained, On the basis of the hydrodynamic model of the flow-solid coupling of the water supply pipeline under the action of the earthquake, the soil-pipe-water coupling effect of the buried water supply pipe under the action of the earthquake is studied by the method of traveling wave. In this paper, the axial stress calculation formula of the earth-pipe-water coupling dynamic model of the buried water supply pipe under the action of earthquake is put forward in this paper. The pipe-soil model of the buried pipeline under the action of earthquake is established by using the ADINA finite element software, and the pipe-soil model is calculated in different pipe diameters and wall thickness. The axial stress of the pipe in the case of a buried depth. In this pipe-soil model, when the seismic intensity of the seismic wave is 鈪，
本文编号：2386769
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