地下管道瞬态瑞雷波信号响应分析
发布时间：2018-09-05 06:41
【摘要】：瑞雷波测试分析技术已在工程地质勘察中得到广泛应用,目前主要针对成层地质条件进行地层与波速划分。但对于类似地下管道等局部地质结构尚缺乏瑞雷波测试分析的理论基础,实际工程中测试人员常习惯于采用单道震动映像测试地下管道,并认同的是纵波反射。瑞雷波是一种与传播方向逆进的椭圆极化波,由于其振动的复杂性,人们还难以直观分析其遇到地下类似管道结构的信号特征,这限制了该方法在实际工程中的应用。与纵波相比,瑞雷波具有能量强的显著特点,探讨地下管道等局部地质结构瑞雷波响应的信号特征,具有重要的理论意义和实际应用价值。本文在中国民航科学基金项目--机场运行保障数字化系统研究(MHRD201230)的支持下,借助ANSYS/LS-DYNA有限元分析软件模拟瑞雷波遇到地下管道的动力响应特征。成功解决了有限元仿真模拟中模型尺寸的确定、震源模型的选择、网格尺寸的划分、边界条件设置和数据格式的转储等问题。通过一系列不同工况条件下的有限元模型计算,并结合工程实例,总结了管道敷设环境参数、采集系统参数设置对瑞雷波响应信号的影响规律。1、提出瑞雷波地震映像法探测地下管线的新方法,经过仿真模拟发现,瑞雷波遇地下管线会在地震道集合波形图上呈现弧形反射信号带。2、通过一系列含有地下管道的有限元模型的计算,拟合出管线埋深h和瑞雷波波速VR、反射特征信号带顶端时间历程Δt的关系式,为管线埋深的快速判定提供一个量化分析模型,并在工程实例中得到验证。经过不同管道上覆刚性面层厚度和不同激震频率相结合的模型的计算,探究了刚性面层厚度和激震频率变化对瑞雷波响应特征信号的影响规律,为工程勘察中激震形式的合理选择提供理论依据和参考。3、系统研究了在不同的管道形状和管径等工况条件下瑞雷波信号响应规律,为实际工程中野外采集系统参数的设置和勘探数据的分析提供理论依据和参考,并在工程实例中得到验证。4、分析了偏移距、道间距等野外采集系统参数对瑞雷波响应信号的影响规律,并给出了这些参数的合理取值范围。5、建立了地下管道的三维仿真模拟模型,进而研究了测线与管线的相对空间位置关系对震动响应信号的影响规律。
[Abstract]:Rayleigh wave test and analysis technology has been widely used in engineering geological survey. At present, stratigraphic and wave velocity are mainly divided according to stratified geological conditions. However, there is no theoretical basis for Rayleigh wave testing and analysis of local geological structures such as underground pipelines. In practical engineering, it is often used to test underground pipelines by using single channel vibration image, and it is recognized that the reflection of longitudinal waves is one of them. Rayleigh wave is an elliptical polarized wave with inverse propagation direction. Because of the complexity of its vibration, it is difficult to analyze directly the signal characteristics of similar underground pipeline structure, which limits the application of this method in practical engineering. Compared with the longitudinal wave, the Rayleigh wave has the characteristic of strong energy. It is of great theoretical significance and practical application value to study the signal characteristics of the Rayleigh wave response of the local geological structure such as the underground pipeline. In this paper, the dynamic response of Rayleigh wave in underground pipeline is simulated with the help of ANSYS/LS-DYNA finite element analysis software, supported by MHRD201230, a project of Civil Aviation Science Foundation of China. The problems such as the determination of model size, the selection of source model, the division of grid size, the setting of boundary conditions and the storage of data format in finite element simulation are successfully solved. Through a series of finite element model calculations under different working conditions and combined with engineering examples, the environmental parameters of pipeline laying are summarized. The influence of acquisition system parameters on Rayleigh wave response signal. 1. A new method for detecting underground pipeline by Rayleigh wave seismic image method is proposed, which is found by simulation. The Rayleigh wave in the underground pipeline will present an arc reflection signal band. 2 on the seismic track set waveform diagram. The calculation of a series of finite element models containing underground pipeline is carried out. The relationship between the buried depth h of the pipeline and the peak time history 螖 t of the Rayleigh wave velocity VR, reflection characteristic signal is fitted, which provides a quantitative analysis model for the quick determination of the buried depth of the pipeline, and is verified by an engineering example. The influence of the thickness of rigid surface and the frequency of excitation on the response characteristic signal of Rayleigh wave is studied through the calculation of the model of the combination of the thickness of rigid surface and the frequency of shock induced by different pipe, and the influence of the thickness of rigid surface and the frequency of excitation on the characteristic signal of Rayleigh wave is studied. This paper provides a theoretical basis and reference for the rational selection of seismic excitation forms in engineering survey. The response law of Rayleigh wave signals under different working conditions such as pipe shape and pipe diameter is systematically studied. It provides theoretical basis and reference for setting parameters of field acquisition system and analysis of exploration data in practical engineering, and is verified in engineering example .4. the offset distance is analyzed. The influence of field acquisition system parameters such as channel spacing on Rayleigh wave response signal is studied. The reasonable value range of these parameters is given, and the 3D simulation model of underground pipeline is established. Furthermore, the influence of the relative spatial position between the line and the pipeline on the vibration response signal is studied.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU990.3
本文编号：2223496
[Abstract]:Rayleigh wave test and analysis technology has been widely used in engineering geological survey. At present, stratigraphic and wave velocity are mainly divided according to stratified geological conditions. However, there is no theoretical basis for Rayleigh wave testing and analysis of local geological structures such as underground pipelines. In practical engineering, it is often used to test underground pipelines by using single channel vibration image, and it is recognized that the reflection of longitudinal waves is one of them. Rayleigh wave is an elliptical polarized wave with inverse propagation direction. Because of the complexity of its vibration, it is difficult to analyze directly the signal characteristics of similar underground pipeline structure, which limits the application of this method in practical engineering. Compared with the longitudinal wave, the Rayleigh wave has the characteristic of strong energy. It is of great theoretical significance and practical application value to study the signal characteristics of the Rayleigh wave response of the local geological structure such as the underground pipeline. In this paper, the dynamic response of Rayleigh wave in underground pipeline is simulated with the help of ANSYS/LS-DYNA finite element analysis software, supported by MHRD201230, a project of Civil Aviation Science Foundation of China. The problems such as the determination of model size, the selection of source model, the division of grid size, the setting of boundary conditions and the storage of data format in finite element simulation are successfully solved. Through a series of finite element model calculations under different working conditions and combined with engineering examples, the environmental parameters of pipeline laying are summarized. The influence of acquisition system parameters on Rayleigh wave response signal. 1. A new method for detecting underground pipeline by Rayleigh wave seismic image method is proposed, which is found by simulation. The Rayleigh wave in the underground pipeline will present an arc reflection signal band. 2 on the seismic track set waveform diagram. The calculation of a series of finite element models containing underground pipeline is carried out. The relationship between the buried depth h of the pipeline and the peak time history 螖 t of the Rayleigh wave velocity VR, reflection characteristic signal is fitted, which provides a quantitative analysis model for the quick determination of the buried depth of the pipeline, and is verified by an engineering example. The influence of the thickness of rigid surface and the frequency of excitation on the response characteristic signal of Rayleigh wave is studied through the calculation of the model of the combination of the thickness of rigid surface and the frequency of shock induced by different pipe, and the influence of the thickness of rigid surface and the frequency of excitation on the characteristic signal of Rayleigh wave is studied. This paper provides a theoretical basis and reference for the rational selection of seismic excitation forms in engineering survey. The response law of Rayleigh wave signals under different working conditions such as pipe shape and pipe diameter is systematically studied. It provides theoretical basis and reference for setting parameters of field acquisition system and analysis of exploration data in practical engineering, and is verified in engineering example .4. the offset distance is analyzed. The influence of field acquisition system parameters such as channel spacing on Rayleigh wave response signal is studied. The reasonable value range of these parameters is given, and the 3D simulation model of underground pipeline is established. Furthermore, the influence of the relative spatial position between the line and the pipeline on the vibration response signal is studied.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU990.3
【参考文献】
相关期刊论文 前10条
1 张宇辉;张献民;;地震映像技术在地下工程透水事故中的应用[J];南京航空航天大学学报;2012年02期
2 肖立锋;;综合物探方法在施工后岩溶探查中的应用[J];工程地球物理学报;2012年02期
3 龚亚琦;陈琴;崔建华;谢小玲;;坝体—地基—库水体系的动力有限元分析及其应用[J];水电能源科学;2012年01期
4 何峰;金福喜;;瞬态面波法在地下洞室探测中的应用[J];广东建材;2009年09期
5 李业君;张玉池;温佩琳;张兆京;;夹层厚度对瑞利面波频散曲线的影响[J];矿产与地质;2008年05期
6 郭晔;黄新;;瑞利波频散曲线影响因素的正演模拟研究[J];工程勘察;2008年02期
7 单波;张玉芬;师学明;韩晓飞;;互相关滤波在铁路岩溶勘探中的应用[J];工程地球物理学报;2007年06期
8 谷音;刘晶波;杜义欣;;三维一致粘弹性人工边界及等效粘弹性边界单元[J];工程力学;2007年12期
9 刘晶波;谷音;杜义欣;;一致粘弹性人工边界及粘弹性边界单元[J];岩土工程学报;2006年09期
10 张金清,梁青,陈超;软弱夹层瑞雷面波频散曲线特征[J];工程地球物理学报;2005年03期
相关会议论文 前1条
1 熊章强;张大洲;宁刚;刘彦华;;瑞雷面波有限差分法数值模拟[A];中国地球物理学会第22届年会论文集[C];2006年
相关博士学位论文 前3条
1 王勇;城市地下管线探测技术方法研究与应用[D];吉林大学;2012年
2 潘冬明;瑞雷面波频散分析与应用[D];中国矿业大学;2009年
3 李晶;面波在地震波场中的特性研究及其应用[D];成都理工大学;2006年
相关硕士学位论文 前4条
1 唐海兵;复杂公路路基瑞利波探测中的频散曲线研究[D];哈尔滨工业大学;2008年
2 郭君;地下洞穴的瑞利面波波场特征有限元数值模拟研究[D];西南交通大学;2008年
3 梁志强;层状介质中多模式面波频散曲线研究[D];长安大学;2006年
4 康燕玲;水泥土防渗墙无损检测方法的研究[D];天津大学;2005年
，本文编号：2223496
本文链接：https://www.wllwen.com/jingjilunwen/jianzhujingjilunwen/2223496.html
