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首页> 外文会议>Association of State Dam Safety Officials, Inc. 2002 Annual Conference Sep 8-11, 2002 Tampa, Florida >IMAGING THE ANATOMY OF EARTHEN DAMS USING GROUND PENETRATING RADAR
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IMAGING THE ANATOMY OF EARTHEN DAMS USING GROUND PENETRATING RADAR

机译：用地磁雷达成像地雷的解剖图

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摘要

Ground penetrating radar (GPR) surveys were performed in support of seepage investigations of two earthen dams in Indiana and Michigan. Both surveys were initiated only when groundwater seeps emerged after initial remedial measures were implemented. High-resolution GPR images depicted the complex internal structures of the dams, and provided the bases for conceptual models of groundwater flow processes within the dams. GPR surveys of both dams included a series of longitudinal and lateral GPR profiles. In both surveys, vertical and lateral variations in the physical properties of the earth fill resulted in variable depths of radar penetration and resolution. In addition, unwanted but identifiable reflections resulted from overhead and underground objects. The reduction of their affects required slightly more advanced data processing procedures than was required over the remainder of the dams. At the first dam, standard data processing routines yielded GPR images of soil and fill boundaries within the embankment, the position of a geocomposite drain buried beneath the embankment, and seepage through the geocomposite into the overlying fill. A strong reflective body, representing a water-saturated zone, was observed near the location of the present-day seep. Additionally, the GPR images depicted soil boundaries that correlated with individual lifts placed during construction and zones of increased porosity. At the second dam, the GPR surveys imaged toe drains, lateral drains, and the interpreted presence of voids near an abutment wall. Additionally, the images suggested the presence of perched water near the seep area. Unfortunately, the phreatic surface could not be continuously mapped at either dam. The inability to image the groundwater surface is attributed to the low porosity and, consequently, large and gradual capillary zone present in both dams. However, groundwater flow characteristics were interpreted from the presence of signal amplitude anomalies and physical observations from seeps and piezometers.
机译：进行了探地雷达（GPR）调查，以支持对印第安纳州和密歇根州的两个土坝的渗流调查。两项调查仅在实施初始补救措施后出现地下水渗漏时才启动。高分辨率的GPR图像描绘了大坝的复杂内部结构，并为大坝内地下水流动过程的概念模型提供了基础。这两个大坝的GPR调查包括一系列纵向和横向GPR剖面。在这两个调查中，填土的物理特性在垂直和横向上的变化都会导致雷达穿透深度和分辨率的变化。此外，高架和地下物体还产生了不需要但可识别的反射。减少其影响所需的数据处理程序要比其余大坝所需的数据处理程序略高一些。在第一个大坝上，标准数据处理程序生成了路堤内土壤和填充边界的GPR图像，埋在路堤下的土工复合材料排水沟的位置，以及通过土工复合材料渗入上方的填充物中。在今天渗水的位置附近观察到一个代表水饱和区的强反射体。此外，GPR图像还描述了土壤边界，这些边界与在施工过程中放置​​的单个举升和孔隙率增加的区域相关。在第二个大坝上，GPR勘测了脚趾排水沟，侧向排水沟以及在邻接墙附近出现的空洞的图像。另外，图像表明在渗水区域附近存在栖息的水。不幸的是，潜水面无法在两个水坝上连续绘制。无法对地下水表面成像的原因是孔隙率低，因此在两个大坝中都存在较大且逐渐形成的毛细管区。然而，从信号振幅异常的存在以及渗漏和压强仪的物理观测结果可以解释地下水流动特征。

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