探地雷达在地下管线探测中的应用研究
发布时间：2018-07-17 16:21
【摘要】：城市地下工程建设必须对地下管线进行准确的定位,但目前多种探测方法精度均不高,因此,对影响探测精度的因素进行深入地分析研究具有理论和实践意义。以地下管线为研究对象,运用探地雷达模拟软件GprMax结合MATLAB语言,针对各向同性均匀介质的探测体进行了建模,分析了不同参数对管线探测效果的影响。建立了复杂条件下的探测体层状模型,通过改变天线频率研究了中低频天线对分辨率、探测深度以及管径、管线材质的影响,结果表明50~600MHz频率的天线能探测到埋深1 m条件下40 mm的金属管,并可以根据管线剖面图判断出管径大小和充填物质。分别建立了复杂层状条件下近间距、非金属地下管线探测的模型,根据金属管线和非金属管线雷达反射波图像的不同判断管线材质。针对非目标体、填土不密实和地下水等干扰因素进行了模拟研究,结果表明地下水含量对探测结果影响较大,现场探测应最大限度的排除干扰,以提高探测的准确度。针对某地下工程管线探测,利用先进的探地雷达技术,采用Gpr Max软件进行了模拟,模拟结果与实测结果一致。理论和实践证明,论文所采用的探测方法和图像解译手段能清晰的反映目标体的特征,准确定位管线。
[Abstract]:It is necessary to locate the underground pipeline accurately in the construction of urban underground engineering, but the accuracy of many detection methods is not high at present. Therefore, it is of theoretical and practical significance to deeply analyze and study the factors that affect the detection accuracy. Taking underground pipeline as research object, using GPR simulation software GprMax and MATLAB language, the model of isotropic and homogeneous medium is modeled, and the influence of different parameters on pipeline detection effect is analyzed. By changing the antenna frequency, the effects of the medium-low frequency antenna on the resolution, detection depth, pipe diameter and pipeline material are studied. The results show that the antenna with a frequency of 50 ~ 600MHz can detect 40 mm metal pipes at a depth of 1 m, and can be used to determine the diameter of the pipes and the filling materials according to the pipeline profiles. The detection models of near-spaced and non-metallic underground pipelines under complex stratified conditions are established respectively. The pipeline materials are judged according to the radar reflection wave images of metal pipelines and non-metal pipelines. In this paper, the interference factors, such as non-target body, uncompacted fill and groundwater, are simulated. The results show that the groundwater content has a great influence on the detection results, and the on-site detection should exclude the interference to the greatest extent in order to improve the accuracy of detection. Based on the advanced ground penetrating radar (GPR) technology, the GPR Max software is used to simulate the pipeline detection of an underground engineering. The simulation results are in agreement with the measured results. It is proved theoretically and practically that the detection method and image interpretation method used in this paper can clearly reflect the characteristics of the object and locate the pipeline accurately.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU990.3
[Abstract]:It is necessary to locate the underground pipeline accurately in the construction of urban underground engineering, but the accuracy of many detection methods is not high at present. Therefore, it is of theoretical and practical significance to deeply analyze and study the factors that affect the detection accuracy. Taking underground pipeline as research object, using GPR simulation software GprMax and MATLAB language, the model of isotropic and homogeneous medium is modeled, and the influence of different parameters on pipeline detection effect is analyzed. By changing the antenna frequency, the effects of the medium-low frequency antenna on the resolution, detection depth, pipe diameter and pipeline material are studied. The results show that the antenna with a frequency of 50 ~ 600MHz can detect 40 mm metal pipes at a depth of 1 m, and can be used to determine the diameter of the pipes and the filling materials according to the pipeline profiles. The detection models of near-spaced and non-metallic underground pipelines under complex stratified conditions are established respectively. The pipeline materials are judged according to the radar reflection wave images of metal pipelines and non-metal pipelines. In this paper, the interference factors, such as non-target body, uncompacted fill and groundwater, are simulated. The results show that the groundwater content has a great influence on the detection results, and the on-site detection should exclude the interference to the greatest extent in order to improve the accuracy of detection. Based on the advanced ground penetrating radar (GPR) technology, the GPR Max software is used to simulate the pipeline detection of an underground engineering. The simulation results are in agreement with the measured results. It is proved theoretically and practically that the detection method and image interpretation method used in this paper can clearly reflect the characteristics of the object and locate the pipeline accurately.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU990.3
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本文编号：2130224
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