探地雷达探测地下管线机理研究及实例分析     

刘斌  李文峰  李术才 《岩土力学》2006,27(Z1):459-463

探地雷达是一种适应快速、准确探测地下障碍物而迅速发展的新型电磁仪器。探讨了探地雷达探测地下管线的机理,得出了走时曲线方程,并通过对探测实例详细地分析亦探讨了复杂条件下探地雷达资料采集和图像解释的方法,介绍了一维滤波、偏移回归、时深转换等数据处理方法和经验,验证了该方法的可行性,表明该技术具有良好地应用前景。  相似文献   

几种探地雷达的对比研究     

刘传孝  蒋金泉  杨永杰  谭云亮 《煤田地质与勘探》2002,30(4):49-51

通过对几种探地雷达技术的机理、性能和探测效果进行对比研究,得出了它们的共性和各自特点,对探地雷达技术的发展具有参考价值。   相似文献   

断层特征参数地质雷达探测与识别的应用研究   总被引：2，自引：0，他引：2  

刘传孝  蒋金泉  杨永杰 《岩土力学》2004,25(5):832-834

在地下空间中,用地质雷达方法沿水平方向探测可以确定断层的位置及走向,沿垂直方向探测可以测定断层的倾向、倾角和落差,但不能用于查明断层面内充填物的详细情况。因此,采用地质雷达方法对断层部分特征参数的准确判定,对地下工程的开挖与维护具有一定的工程地质意义。  相似文献   

堤防动物洞穴的探地雷达探测研究   总被引：3，自引：0，他引：3  

王国群  何开胜 《岩土力学》2006,27(5):838-841

通过探地雷达对淮沭河大堤獾洞隐患的探测,分析了獾洞的结构特征,给出了獾洞的典型雷达图像特征,推断了测区内獾洞穴道的位置、深度和走向,为堤防獾洞隐患治理提供了资料。探测结果表明,探地雷达设备轻便,对场地要求低,易于在任意方向加密探测,对浅层地下洞穴的探测非常有效。  相似文献   

Location of buried plastic pipes using multi-agent support based on GPR images     

David Ayala-CabreraManuel Herrera  Joaquín IzquierdoRafael Pérez-García 《Journal of Applied Geophysics》2011,75(4):679-686

This work focuses on the generation of tools to aid inspection and identify buried plastic pipes in water supply systems (WSS). In our study we use ground penetrating system (GPR) images as a non-destructive method of obtaining information without altering the system conditions and the environmental characteristics. A viability study for extracting features, and an approach to the above-mentioned application based on multi-agent systems are addressed in this paper. Firstly, we use intensive matrix manipulation of the GPR output for preprocessing the images. As a result, two matrices are produced that classify initial data based on the original radargram of the wave amplitude parameter. Then the plastic pipe characteristics that offer an enhanced likelihood of location are defined. This procedure is evaluated through two case-studies. One study corresponds to a simple case (one pipe) and the other corresponds to various pipes (made of different materials). Both cases were developed under controlled laboratory conditions. The obtained results are promising, and we show that automatic plastic pipe location has been achieved. The main contributions of the procedures proposed in this work are: firstly, highly skilled GPR prospection operators become unnecessary for plastic pipe location using GPR images; and secondly, we have opened a route to further classification that makes use of other methodologies.  相似文献   

Integration of sedimentology and ground‐penetrating radar for high‐resolution imaging of a carbonate platform     

STÉPHAN J. JORRY  GRÉGORY BIÉVRE 《Sedimentology》2011,58(6):1370-1390

Ground‐penetrating radar has not been applied widely to the recognition of ancient carbonate platform geometries. This article reports the results of an integrated study performed on an Upper Jurassic outcrop from the south‐east Paris basin, where coral bioherms laterally change into prograding depositional sequences. Ground‐penetrating radar profiles illustrate the different bedding planes and major erosional unconformities visible at outcrop. A ground‐penetrating radar profile conducted at the base of the cliff displays a palaeotopographic surface on which the outcropping bioherms settled. The excellent penetration depths of the ground‐penetrating radar (20 m with a monostatic 200 MHz antenna) images the carbonate platform geometries, ranging between outcrop workscale (a few metres) and seismic scale (several hundreds of metres). This study supports recent evidence of icehouse conditions and induced sea‐level fluctuations controlling the Upper Jurassic carbonate production.  相似文献   

探地雷达在桥塔塔基岩溶勘查中的应用及信号分析   总被引：1，自引：0，他引：1  

杨天春  冯建新  王战军 《物探与化探》2011,35(2):280-284

以湖南省张家界—花垣县高速公路岩溶勘查为例,探讨探地雷达在竖直型岩溶勘查中的应用和效果;同时,说明复信号分析方法在探地雷达数据处理中的有效性。竖向岩溶的横向规模小,在雷达图像中相应的异常范围比较窄,异常不易分辨。首先对原始采集信号进行二维空间域滤波,再对信号进行Hilbert变换,提取雷达信号的瞬时振幅、瞬时相位和瞬时频率,然后对这些处理后的信号进行综合分析。研究结果表明,二维空间域滤波可大大消除高频噪声的干扰,提高信号的信噪比,多参数综合分析可提高探地雷达解释的精度,最终的钻探成果也验证了反演解释结果的正确性。  相似文献   

隧道衬砌质量地质雷达检测研究   总被引：2，自引：0，他引：2  

吴彬  李远强  黄来源  李军辉 《城市地质》2008,3(2):39-42

采用地质雷达检测的方法可以对隧道衬砌混凝土的厚度,密实性,脱空,钢格栅数量等进行快速检测,这种检测方法不仅克服了目测不准确及打孔抽查检测不全面的缺点,而且以其高分辨率,高准确性,探测快速及无损检测的优,点,在隧道衬砌质量检测中取得了非常明显的效果,并得到了广泛的应用。地质雷达在隧道检测中所暴露的技术问题也亟待解决。本文介绍了地质雷达在隧道衬砌质量检测中的实际应用,研究了在不同的隧道衬砌设计条件下的雷达探测方式,雷达天线频率的选择、参数选择和检测成果。  相似文献   

基于背景矩阵减法的探地雷达杂波信号抑制方法研究     

彭建  钟景阳  白洁  孟旭  王洪华  刘海 《矿产与地质》2021,(1):141-147

探地雷达是探测浅层地下目标并对其空间分布进行成像的重要地球物理方法之一,但在实测雷达剖面中,目标反射信号不可避免地会受到直达波和地面反射波等杂波信号的干扰。为了提高探地雷达数据解译的可靠性和准确性,需要对杂波进行抑制或去除。提出一种背景矩阵减法来抑制杂波信号,并通过两组仿真数据和两组实测数据示例与减平均道法、奇异分解法对杂波抑制效果进行对比分析,结果表明背景矩阵减法的效果明显优于减平均道法和奇异分解法,可以在保证有效信号不丢失,幅值和相位不失真的基础上,使杂波得到较好地抑制,有助于识别探地雷达剖面中目标信号的特征,提高数据解译准确性和可靠性。  相似文献   

The Impact Of Extreme Summer Melt on Net Accumulation of an Avalanche Fed Glacier,as Determined by Ground‐Penetrating Radar          下载免费PDF全文

Heather Purdie  Wolfgang Rack  Brian Anderson  Tim Kerr  Trevor Chinn  Ian Owens  Matthew Linton 《Geografiska Annaler: Series A, Physical Geography》2015,97(4):779-791

Glacier mass balance is more sensitive to warming than cooling, but feedbacks related to the exposure of previously buried firn and ice in very warm years is not generally considered in sensitivity studies. A ground‐penetrating radar survey in the accumulation area of Rolleston Glacier, New Zealand shows that five years of previous net accumulation was removed by melt from parts of the glacier above the long‐term equilibrium line altitude during a single negative mass balance year. Rolleston Glacier receives a large amount of accumulation from snow avalanches, which may temporarily buffer it from climate warming by providing additional mass that has accumulated at higher elevations, effectively increasing the elevation range of the glacier. However, glaciers reliant on avalanche input may have high sensitivity to climatic variations because the extra mass is concentrated on a small part of the glacier, and small variations in avalanche input could have a large impact on overall glacier accumulation. Further research is needed to better estimate the amount and spatial distribution of accumulation by avalanche in order to quantify the climate sensitivity of small avalanche‐fed glaciers.  相似文献