地下铁质管线的地面高精度磁测数值模拟
|
摘要
为了能够准确探测地下铁质管线,利用多物理场有限元软件Comsol建立了铁质管线的磁异常响应的三维数值模拟模型,将均匀磁化球体模型的数值解与解析解进行对比,验证了计算程序的准确性,分析了管道的相对磁导率、长度、外径和走向对磁异常信号的影响规律.由模拟结果可知,管道的相对磁导率和外径与磁异常信号的幅值呈正相关,不影响其基本波形;当管道长度较长时,中间段磁异常变化很小;当管道长度较短时,中间段磁异常变化剧烈;管道走向可严重影响管道磁异常信号的幅值和波形.管道端点处具有较大的正磁异常或负磁异常,可通过连接两端磁异常的顶点和谷点,确定管道走向.通过模型检验,表明化极处理可以有效识别管道的埋深和平面位置.
To detect underground metal pipes precisely,a 3Dnumerical model was built to study the magnetic response of the underground metal pipes using multiphysics finite element method(FEM)software Comsol.The numerical solutions of a uniformly magnetized sphere were compared with the analytical solutions and results validated the accuracy of the computation program.Based on the model,the relative permeability,length,outer diameter and direction of the pipe were analyzed.Numerical simulation results show that the relative permeability and outer diameter are positively relative to the magnetic anomaly amplitude,but have nothing to do with the magnetic anomaly phase degree;when the pipe is long,the magnetic anomaly at the middle of the pipe changes little;when the pipe is short,the magnetic anomaly at the middle of the pipe changes dramatically;the pipe direction has great effects on the amplitude and shape of the magnetic anomaly.Big amplitude of magnetic anomaly can be detected at two ends of the pipe,and the direction of pipe can be determined by connecting the peak point and valley point at both ends.Also,experiment results show reduction to the pole helps effectively identify the depth and horizontal position of the pipe.
To detect underground metal pipes precisely,a 3Dnumerical model was built to study the magnetic response of the underground metal pipes using multiphysics finite element method(FEM)software Comsol.The numerical solutions of a uniformly magnetized sphere were compared with the analytical solutions and results validated the accuracy of the computation program.Based on the model,the relative permeability,length,outer diameter and direction of the pipe were analyzed.Numerical simulation results show that the relative permeability and outer diameter are positively relative to the magnetic anomaly amplitude,but have nothing to do with the magnetic anomaly phase degree;when the pipe is long,the magnetic anomaly at the middle of the pipe changes little;when the pipe is short,the magnetic anomaly at the middle of the pipe changes dramatically;the pipe direction has great effects on the amplitude and shape of the magnetic anomaly.Big amplitude of magnetic anomaly can be detected at two ends of the pipe,and the direction of pipe can be determined by connecting the peak point and valley point at both ends.Also,experiment results show reduction to the pole helps effectively identify the depth and horizontal position of the pipe.
引文
[1]龚大利,刘得军,叶珲,等.基于OpenGL的油田地下管线探测数据三维成像方法[J].大庆石油学院学报.2011,35(6):97-101.GONG Dali,LIU Dejun,YE Hui,et al.3Dimaging method for the detecting data of buried pipelines in oilfield based on OpenGL[J].Journal of Daqing Petroleum Institute,2011,35(6):97-101.
[2]龚大利,张嵩,李辉,等.基于磁异常信号的油田地下管线探测方法[J].大庆石油学院学报,2011,35(6):102-106.GONG Dali,ZHANG Song,LI Hui,et.al.Method for detecting buried pipelines based on magnetic anomaly signal[J].Journal of Daqing Petroleum Institute,2011,35(6):102-106.
[3]张嵩,刘得军,李辉,等.各向异性磁阻传感器在地磁探测中的应用[J].自动化仪表,2011,32(11):53-55.ZHANG Song,LIU Dejun,LI Hui,et al.Application of anisotropic magnetoresistive sensor in survey of geomagnetism[J].Process Automation Instrumentation,2011,32(11):53-55.
[4]SHAW R K,AGARWAL B N P,NANDI B K.Use of Walsh transforms in estimation of depths of idealized sources from total-field magnetic anomalies[J].Computers&Geoscience,2007,33(7):966-975.
[5]SANCHEZ V,LI Yaoguo,NABIGHIAN M N,et al.Numerical modeling of higher order magnetic moments in UXO discrimination[J].IEEE Transactions on Geoscience and Remote Sensing,2008,46(9):2568-2583.
[6]GUO Zhiyong,LIU Dejun,PAN Qi,et al.Forward modeling of total magnetic anomaly over a pseudo-2D underground ferromagnetic pipeline[J].Journal of Applied Geophysics,2015,113:14-30.
[7]柴录泽,郭根会.浅谈大埋深管线探测技术方法[J].测绘通报,2013(增2):71-73.CHAI Luze,GUO Genhui.Discussion of the detection method of the larger burial depth pipline[J].Bulletin of Surveying and Mapping,2013(Supp 2):71-73.
[8]刘双,刘天佑,高文利,等.退磁作用对磁测资料解释的影响[J].物探与化探,2012,36(4):602-606.LIU Shuang,LIU Tianyou,GAO Wenli,et al.The influence of demagnetization on magenetic data interpretation[J].Geophysical and Geochemical Exploration,2012,36(4):602-606.
[9]徐世浙,赵生凯,钱耀中.应用有限元法计算磁各向异性体的磁异常[J].物化探电子计算技术,1983(4):1-5.XU Shizhe,ZHAO Shengkai,QIAN Yaozhong.Calculating the magnetic anomaly of the anisotropic body using FEM[J].Geophysical and Geochemical Computing Technology,1983(4):1-5.
[10]CHURCHILL K M,LINK C,YOUMANS C C.A comparison of the finite-element method and analytical method for modeling unexploded ordnance using magnetometry[J].IEEE Transactions on Geoscience and Remote Sensing,2012,50(7):2720-2732.
[11]JESHVAGHANI M S,DARIJANI M.Two-dimensional geomagnetic forward modeling using adaptive finite element method and investigation of the topographic effect[J].Journal of Applied Geophysics,2014,105:169-179.
[12]THBAUIT E,FINLAY C C,BEGGAN C D,et al.International geomagnetic reference field:the 12th generation[J].Earth,Planets and Space,2015,67:79-80.
[13]李宗翔,王天明,贾进章,等.矿井巷道中外源气体运移-弥散过程仿真研究[J].中国矿业大学学报,2013,42(5):731-735.LI Zongxiang,WANG Tianming,JIA Jinzhang,et al.Numerical simulation of migration and diffusion of exogenous gas in mine roadways[J].Journal of China University of Mining&Technology,2013,42(5):731-735.
[14]刘金元,王煤,陈超.三组分煤层气吸附的数值模拟研究[J].中国矿业大学学报,2013,42(6):965-969.LIU Jinyuan,WANG Mei,CHEN Chao.Simulation of adsorption process of ternary-components coalbed cosine[J].Journal of China University of Mining&Technology,2013,42(6):965-969.
[15]BUTLER S L,SINHA G.Forward modeling of applied geophysics methods using Comsol and comparison with analytical and laboratory analog models[J].Computers&Geosciences,2012,42:168-176.
[16]刘占林,张瑞卫.浅谈城市地下管线探测方法[J].现代测绘,2014,37(5):41-44.LIU Zhanlin,ZHANG Ruiwei.Introduction to urban underground pipeline detection method[J].Modern Surveying and Mapping,2014,37(5):41-44.
[2]龚大利,张嵩,李辉,等.基于磁异常信号的油田地下管线探测方法[J].大庆石油学院学报,2011,35(6):102-106.GONG Dali,ZHANG Song,LI Hui,et.al.Method for detecting buried pipelines based on magnetic anomaly signal[J].Journal of Daqing Petroleum Institute,2011,35(6):102-106.
[3]张嵩,刘得军,李辉,等.各向异性磁阻传感器在地磁探测中的应用[J].自动化仪表,2011,32(11):53-55.ZHANG Song,LIU Dejun,LI Hui,et al.Application of anisotropic magnetoresistive sensor in survey of geomagnetism[J].Process Automation Instrumentation,2011,32(11):53-55.
[4]SHAW R K,AGARWAL B N P,NANDI B K.Use of Walsh transforms in estimation of depths of idealized sources from total-field magnetic anomalies[J].Computers&Geoscience,2007,33(7):966-975.
[5]SANCHEZ V,LI Yaoguo,NABIGHIAN M N,et al.Numerical modeling of higher order magnetic moments in UXO discrimination[J].IEEE Transactions on Geoscience and Remote Sensing,2008,46(9):2568-2583.
[6]GUO Zhiyong,LIU Dejun,PAN Qi,et al.Forward modeling of total magnetic anomaly over a pseudo-2D underground ferromagnetic pipeline[J].Journal of Applied Geophysics,2015,113:14-30.
[7]柴录泽,郭根会.浅谈大埋深管线探测技术方法[J].测绘通报,2013(增2):71-73.CHAI Luze,GUO Genhui.Discussion of the detection method of the larger burial depth pipline[J].Bulletin of Surveying and Mapping,2013(Supp 2):71-73.
[8]刘双,刘天佑,高文利,等.退磁作用对磁测资料解释的影响[J].物探与化探,2012,36(4):602-606.LIU Shuang,LIU Tianyou,GAO Wenli,et al.The influence of demagnetization on magenetic data interpretation[J].Geophysical and Geochemical Exploration,2012,36(4):602-606.
[9]徐世浙,赵生凯,钱耀中.应用有限元法计算磁各向异性体的磁异常[J].物化探电子计算技术,1983(4):1-5.XU Shizhe,ZHAO Shengkai,QIAN Yaozhong.Calculating the magnetic anomaly of the anisotropic body using FEM[J].Geophysical and Geochemical Computing Technology,1983(4):1-5.
[10]CHURCHILL K M,LINK C,YOUMANS C C.A comparison of the finite-element method and analytical method for modeling unexploded ordnance using magnetometry[J].IEEE Transactions on Geoscience and Remote Sensing,2012,50(7):2720-2732.
[11]JESHVAGHANI M S,DARIJANI M.Two-dimensional geomagnetic forward modeling using adaptive finite element method and investigation of the topographic effect[J].Journal of Applied Geophysics,2014,105:169-179.
[12]THBAUIT E,FINLAY C C,BEGGAN C D,et al.International geomagnetic reference field:the 12th generation[J].Earth,Planets and Space,2015,67:79-80.
[13]李宗翔,王天明,贾进章,等.矿井巷道中外源气体运移-弥散过程仿真研究[J].中国矿业大学学报,2013,42(5):731-735.LI Zongxiang,WANG Tianming,JIA Jinzhang,et al.Numerical simulation of migration and diffusion of exogenous gas in mine roadways[J].Journal of China University of Mining&Technology,2013,42(5):731-735.
[14]刘金元,王煤,陈超.三组分煤层气吸附的数值模拟研究[J].中国矿业大学学报,2013,42(6):965-969.LIU Jinyuan,WANG Mei,CHEN Chao.Simulation of adsorption process of ternary-components coalbed cosine[J].Journal of China University of Mining&Technology,2013,42(6):965-969.
[15]BUTLER S L,SINHA G.Forward modeling of applied geophysics methods using Comsol and comparison with analytical and laboratory analog models[J].Computers&Geosciences,2012,42:168-176.
[16]刘占林,张瑞卫.浅谈城市地下管线探测方法[J].现代测绘,2014,37(5):41-44.LIU Zhanlin,ZHANG Ruiwei.Introduction to urban underground pipeline detection method[J].Modern Surveying and Mapping,2014,37(5):41-44.