爆破振动下埋地天然气管道的动力响应研究
发布时间：2018-08-08 11:46
【摘要】：埋地管道作为一种安全、经济、高效的运输方式已大量应用于天然气远程运输行业。随着我国高铁化进程的实施,在进行隧道爆破掘进施工时产生的爆破振动必然会对临近埋地管道周围的地层产生扰动,给埋地管道的安全运行带来威胁。而天然气管道一旦发生事故(破裂、爆管或渗漏),除了管道系统自身的损坏造成的直接损失之外,还可能引发严重的次生灾害,引起火灾或者爆炸,甚至造成人员伤亡。在建的西安至成都客运专线仙女岩隧道下穿兰-成-渝埋地天然气管道,在隧道掘进施工过程中产生的爆破振动可能危及隧道上方埋地天然气管道的安全运行。为确保天然气管道的安全运行,分析爆破振动对埋地管道的影响程度,本文以隧道减震控制爆破的实时振动监测为基础,采用数值模拟方法进行爆破振动作用下埋地天然气管道的动力响应研究,主要分析在不同埋地天然气管道运行工况条件下管道的动应力分布特征及其变化规律。隧道施工过程中采用减震控制爆破技术降低爆破产生的振动效应,在进行的27次现场爆破中,监测到的埋地天然气管道上方地表的振动强度基本上未超过管道安全运行规定的2cm/s的峰值振动速度要求,保证了天然气管道的安全、正常运行。通过分析隧道开挖减震控制爆破的地表振动速度波形的特征参数发现,埋地天然气管道上方地表的爆破地震波具有频率高、衰减快、持续时间短的特点,在与爆破中心相距40-60m范围内的振动速度波形的主频多大于20Hz、持续时间一般在1秒以内。以仙女岩隧道下穿埋地天然气管道段的爆破施工为背景,参照天然气管道的敷设规范,建立爆破振动下埋地天然气管道的三维有限元模型,通过模拟计算结果与现场实测振动数据的对比分析,既检验模拟计算结果的准确性,又进一步修改完善模型参数。以管道振动应力为研究对象,进行不同管道运行工况下的埋地天然气管道的动力响应分析,包括：不同管道内压、不同管上之间摩擦系数和不同管径等条件下爆破振动引起的埋地天然气管道的应力分布状态,探讨天然气管道工况参数对埋地管道动力响应的影响规律。研究证明：在爆破作用下,埋地管道顶部应力最大；最大应力随着内压的增大而增大；管土之间摩擦系数越大,管道的应力越大；增大管径,管道的应力减小。
[Abstract]:As a safe, economical and efficient transportation mode, buried pipeline has been widely used in natural gas long-distance transportation industry. With the implementation of the process of high-speed iron in China, the blasting vibration generated during the tunneling construction will inevitably disturb the strata around the buried pipeline and threaten the safe operation of the buried pipeline. In the event of an accident (rupture, burst or leakage) of natural gas pipeline, in addition to the direct loss caused by the damage of the pipeline system itself, it may also cause serious secondary disasters, fire or explosion, and even cause casualties. Under the Xianyan Tunnel of Xi'an to Chengdu passenger dedicated Line, the natural gas pipeline buried in Lanzhou-Chengdu-Chongqing is under construction. The blasting vibration generated during tunneling may endanger the safe operation of buried natural gas pipeline above the tunnel. In order to ensure the safe operation of natural gas pipeline and analyze the influence of blasting vibration on buried pipeline, this paper is based on the real-time vibration monitoring of tunnel vibration control blasting. The dynamic response of buried natural gas pipeline under blasting vibration is studied by numerical simulation method. The dynamic stress distribution and its variation law of buried natural gas pipeline under different operating conditions are analyzed. In the course of tunnel construction, the vibration effect caused by blasting is reduced by using shock absorption control blasting technology. In 27 field blasting, The vibration intensity of the surface above the buried natural gas pipeline is basically not higher than the peak vibration speed of 2cm/s stipulated by the safe operation of the pipeline, which ensures the safety and normal operation of the natural gas pipeline. By analyzing the characteristic parameters of the surface vibration velocity waveform of the tunnel excavation controlled blasting, it is found that the blasting seismic wave above the buried natural gas pipeline has the characteristics of high frequency, fast attenuation and short duration. In the range of 40-60 m from the blasting center, the main frequency of the vibration velocity waveform is more than 20 Hz, and the duration is generally within 1 second. Under the background of blasting construction of gas pipeline under Xianyan tunnel, a three-dimensional finite element model of buried natural gas pipeline under blasting vibration is established according to the laying code of natural gas pipeline. Through the comparison and analysis between the simulation results and the field measured vibration data, the accuracy of the simulation results is verified, and the model parameters are further modified. The dynamic response of buried natural gas pipeline under different operating conditions is analyzed by taking the vibration stress of pipeline as the research object, including: internal pressure of different pipeline, The stress distribution state of buried natural gas pipeline caused by blasting vibration under the condition of friction coefficient and different pipe diameter between different pipes is discussed in this paper. The influence of operating conditions parameters of natural gas pipeline on dynamic response of buried pipeline is discussed. The results show that the maximum stress at the top of buried pipeline increases with the increase of internal pressure, the greater the coefficient of friction between pipes and soil, the greater the stress of pipeline; the greater the diameter of pipe, the smaller the stress of 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】：2015
【分类号】：TE973
本文编号：2171694
[Abstract]:As a safe, economical and efficient transportation mode, buried pipeline has been widely used in natural gas long-distance transportation industry. With the implementation of the process of high-speed iron in China, the blasting vibration generated during the tunneling construction will inevitably disturb the strata around the buried pipeline and threaten the safe operation of the buried pipeline. In the event of an accident (rupture, burst or leakage) of natural gas pipeline, in addition to the direct loss caused by the damage of the pipeline system itself, it may also cause serious secondary disasters, fire or explosion, and even cause casualties. Under the Xianyan Tunnel of Xi'an to Chengdu passenger dedicated Line, the natural gas pipeline buried in Lanzhou-Chengdu-Chongqing is under construction. The blasting vibration generated during tunneling may endanger the safe operation of buried natural gas pipeline above the tunnel. In order to ensure the safe operation of natural gas pipeline and analyze the influence of blasting vibration on buried pipeline, this paper is based on the real-time vibration monitoring of tunnel vibration control blasting. The dynamic response of buried natural gas pipeline under blasting vibration is studied by numerical simulation method. The dynamic stress distribution and its variation law of buried natural gas pipeline under different operating conditions are analyzed. In the course of tunnel construction, the vibration effect caused by blasting is reduced by using shock absorption control blasting technology. In 27 field blasting, The vibration intensity of the surface above the buried natural gas pipeline is basically not higher than the peak vibration speed of 2cm/s stipulated by the safe operation of the pipeline, which ensures the safety and normal operation of the natural gas pipeline. By analyzing the characteristic parameters of the surface vibration velocity waveform of the tunnel excavation controlled blasting, it is found that the blasting seismic wave above the buried natural gas pipeline has the characteristics of high frequency, fast attenuation and short duration. In the range of 40-60 m from the blasting center, the main frequency of the vibration velocity waveform is more than 20 Hz, and the duration is generally within 1 second. Under the background of blasting construction of gas pipeline under Xianyan tunnel, a three-dimensional finite element model of buried natural gas pipeline under blasting vibration is established according to the laying code of natural gas pipeline. Through the comparison and analysis between the simulation results and the field measured vibration data, the accuracy of the simulation results is verified, and the model parameters are further modified. The dynamic response of buried natural gas pipeline under different operating conditions is analyzed by taking the vibration stress of pipeline as the research object, including: internal pressure of different pipeline, The stress distribution state of buried natural gas pipeline caused by blasting vibration under the condition of friction coefficient and different pipe diameter between different pipes is discussed in this paper. The influence of operating conditions parameters of natural gas pipeline on dynamic response of buried pipeline is discussed. The results show that the maximum stress at the top of buried pipeline increases with the increase of internal pressure, the greater the coefficient of friction between pipes and soil, the greater the stress of pipeline; the greater the diameter of pipe, the smaller the stress of 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】：2015
【分类号】：TE973
【引证文献】
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1 赵长啸;龙源;纪冲;路亮;高福银;廖昆;;土中爆炸冲击作用下埋地管道动力响应数值模拟研究[A];中国爆破新技术Ⅲ[C];2012年
，本文编号：2171694
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