• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Geosciences >Depth Estimates of Buried Utility Systems Using the GPR Method: Studies at the IAG/USP Geophysics Test Site
【24h】

Depth Estimates of Buried Utility Systems Using the GPR Method: Studies at the IAG/USP Geophysics Test Site

机译：使用GPR方法的掩埋实用系统的深度估计：IAG / USP地球物理测试网站的研究

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Identifying underground utilities and predicting their depth are fundamental when it comes to civil engineering excavations, for example, to install or repair water, sewer, gas, electric systems and others. The accidental rupture of these systems can lead to unplanned repair costs, delays in completing the service, and risk injury or death of workers. One way to detect underground utilities is using the GPR-Ground Penetrating Radar geophysical method. To estimate depth, the travel time (two-way travel time) information provided by a radargram is used in conjunction with ground wave velocity, which depends on the dielectric constant of materials, where it is usually assumed to be constant for the area under investigation. This procedure provides satisfactory results in most cases. However, wrong depth estimates can result in damage to public utilities, rupturing pipes, cutting lines and so on. These cases occur mainly in areas that have a marked variation of water content and/or soil lithology, thus greater care is required to determine the depth of the targets. The present work demonstrates how the interval velocity of Dix (1955) can be applied in radargram to estimate the depth of underground utilities compared to the conventional technique of constant velocity applied to the same data set. To accomplish this, synthetic and real GPR data were used to verify the applicability of the interval velocity technique and to determine the accuracy of the depth estimates obtained. The studies were carried out at the IAG/USP test site, a controlled environment, where metallic drums are buried in known positions and depths allowing the comparison of real to estimated depths. Numerical studies were also carried out aiming to simulate the real environment with variation of dielectric constant in depth and to validate the results with real data. The results showed that the depths of the targets were estimated more accurately by means of the interval velocity technique in contrast to the constant velocity technique, minimizing the risks of accidents during excavation.
机译：例如，当涉及土木工程挖掘时，识别地下公用事业并预测其深度是基本的，例如，安装或修理水，下水道，气体，电动系统等。这些系统的意外破裂可能导致计划的维修费用，延迟完成服务，以及工人的风险伤害或死亡。一种检测地下公用事业的一种方法是使用GPR地穿透雷达地球物理方法。为了估计深度，雷达格提供的行进时间（双向行驶时间）与接地波速度结合使用，这取决于材料的介电常数，在那里通常假设在调查中的区域是恒定的。此过程在大多数情况下提供满意的结果。然而，错误的深度估计可能导致公共公用事业，破坏管道，切割线等损坏。这些病例主要发生在具有含水量和/或土壤岩性的标记变异的区域中，因此需要更加小心来确定目标的深度。本工作表明DIX（1955）的间隔速度如何应用于RADARGRAG来估计与应用于相同数据集的恒定速度的传统技术相比的地下实用程序的深度。为了实现这一点，使用合成和实际GPR数据来验证间隔速度技术的适用性，并确定所获得的深度估计的准确性。这些研究在IAG / USP测试部位进行了受控环境，其中金属鼓被埋在已知位置和深度，允许真实地与估计深度的比较。还进行了数值研究，旨在模拟具有深入介电常数变化的真实环境，并用实际数据验证结果。结果表明，借助于恒流技术的间隔速度技术更准确地估计了目标的深度，从而最大限度地减少了挖掘过程中的事故风险。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号