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首页> 外文期刊>Journal of geophysics and engineering >Integrated geophysical surveys for the safety evaluation of a ground subsidence zone in a small city
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Integrated geophysical surveys for the safety evaluation of a ground subsidence zone in a small city

机译：综合地球物理调查，用于评估小城市地面沉降区的安全性

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Ground subsidence occurred in the centre of a small city in South Korea. In order to investigate the cause of the geological hazards and to estimate the ground safety, we carried out integrated geophysical surveys comprising two-dimensional (2D) resistivity, controlled source magnetotelluric (CSMT), magnetic, ground penetrating radar, geophysical well logging and crosshole electrical resistivity tomography (ERT) surveys. Since the target area is located in the downtown area, surface geophysical methods could not be applied systematically. To understand regional geology and to facilitate the interpretation of detailed geophysical surveys in the target area, 2D resistivity, CSMT and magnetic surveys were conducted outside the downtown area. From these results, we could define the regional structure and successively infer the geologic condition in the city centre as well. Among the geophysical techniques applied for the detailed investigation in the main target area, crosshole ERT and geophysical well logging played the most important role. For the efficient ERT field work in the busiest quarter of the city, we devised a new electrode array, modified pole-dipole array, and proved that the proposed array is efficient particularly in the area where installing a remote electrode is nearly impossible. The distribution of cavities and weak zones was interpreted by careful examination of the resistivity tomograms and geophysical logging results. Based on the distribution of cavities interpreted in a 3D manner, numerical analyses of rock engineering were further carried out and geologic hazard maps were presented. Through this comprehensive approach comprising geophysics and rock engineering, shallow limestone cavities were found to be the main cause of the ground subsidence and the excessive pumping of groundwater might trigger or accelerate the geological hazard. Reinforcement works have been carried out based on the results of these geophysical and rock engineering investigations.
机译：地面沉降发生在韩国一个小城市的中心。为了调查地质灾害的原因并评估地面安全性，我们进行了综合地球物理勘测，包括二维（2D）电阻率，受控源大地电磁（CSMT），磁，探地雷达，地球物理测井和横孔电阻层析成像（ERT）调查。由于目标区域位于市区，因此无法系统地应用地表地球物理方法。为了了解区域地质状况并促进对目标地区详细地球物理勘测的解释，在市区以外进行了二维电阻率，CSMT和磁测。从这些结果，我们可以定义区域结构，并依次推断出市中心的地质条件。在主要目标区域中用于详细研究的地球物理技术中，井孔ERT和地球物理测井技术发挥了最重要的作用。为了在城市最繁忙的地区进行高效的ERT现场工作，我们设计了一种新的电极阵列，即改进的极-偶极阵列，并证明了所提出的阵列特别有效，尤其是在几乎不可能安装远程电极的地区。通过仔细检查电阻率层析成像图和地球物理测井结果，可以解释空腔和薄弱区域的分布。根据以3D方式解释的孔洞分布，进一步对岩石工程进行了数值分析，并绘制了地质灾害图。通过包括地球物理学和岩石工程学在内的综合方法，发现浅层石灰岩空洞是造成地面沉降的主要原因，而过多抽入地下水可能会触发或加速地质灾害。根据这些地球物理和岩石工程研究的结果进行了加固工作。

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