【作者】 罗小龙；

【导师】 唐新功；

【作者基本信息】 长江大学 ， 地球探测与信息技术， 2018， 硕士

【摘要】 现代化城市的建设,离不开城市地下工程的建设,地下管线就像是城市的血管一样,对城市的建设起着决定性的作用,对地下管线准确地位以及改造是现在最迫切的事情。针对地下管线,运用最新GprMax软件结合Matlab和python语言对地下管线的各种情况进行各向同性介质的建模。建立地下管线金属和非金属模型,分析金属与非金属管道的响应特征,以分析不同管线的特征,对资料解释提供依据;建立不同间距天线模型,通过改变接受天线和发射天线之间间距,研究了探测方法不同对探地雷达探测的影响;建立不同管径、埋深和管间距模型,改变管径、埋深和管间距,讨论管线属性在探地雷达中的变化规律,对比分析数值模拟图,探地雷达对不同属性的管线探测能力和分辨有限,不同管线响应特征需要针对性的判断。根据实际施工时三类管线的难点进行建模分析对比,三类管线为排水、电力和给水。排水中的掩埋井和满水问题、电力管线管径过小难以探测问题和给水管线埋深较深干扰问题。针对这三个问题,进行建模分析,最后得出结论。为解决管线中响应特征不明显问题,利用了希尔伯特和小波变换对数值模拟结果进行处理,提取弱信号异常点,准确判断管线埋深管径等信息。更多还原

【Abstract】 The construction of the modern city can not be separated from the construction of the urban underground engineering.The underground pipelines,like the blood vessels of the city,play a decisive role in the construction of the city,and the exact position and transformation of the underground pipelines are the most urgent things now.Aiming at underground pipelines,the latest GprMax software and Matlab and python language are used to model the isotropic medium for various situations of underground pipelines.The metal and non-metal models of underground pipelines are established,and the response characteristics of metal and non-metallic pipelines are analyzed to analyze the characteristics of different pipelines and provide basis for data interpretation.The model of different pipe diameter,buried depth and tube spacing is set up,the pipe diameter,depth and distance between pipes are changed,the changing law of pipeline property in ground penetrating radar is discussed,and the numerical simulation diagram is compared and analyzed.The detection ability and resolution of the pipeline for different attributes are limited,and the different Guan Xianxiang characteristics need to be judged.According to the actual construction of the three kinds of pipeline difficulties modeling analysis and comparison,the three kind of pipeline is drainage,power and water supply.The problem of buried well and full water in the drainage,the small diameter of the power line,the difficulty of detection and the deep interference of the water supply line are deep.In view of these three problems,the modeling analysis is carried out and finally the conclusion is drawn.In order to solve the problem that the response characteristics of the pipeline are not obvious,Hilbert and wavelet transform are used to deal with the numerical simulation results,to extract the abnormal point of the weak signal and to accurately judge the information of the pipeline buried depth and so on.更多还原