Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Study on the discharge of soil particles and ground collapse through cracks in underground structures

지중구조물 균열을 통한 토립자 유출 및 지반함몰 특성 연구

  • Kim, Ho-Jong (Disaster Prevention Research Division, National Disaster Management Research Institute) ;
  • Kim, Kang-Hyun (Dept. of Civil and Environmental Engineering, Konkuk University) ;
  • Shin, Jong-Ho (Dept. of Civil and Environmental Engineering, Konkuk University)
  • 김호종 (국립재난안전연구원 방재연구실 지반재난실험팀) ;
  • 김강현 (건국대학교 사회환경공학부) ;
  • 신종호 (건국대학교 사회환경공학부)
  • Received : 2019.07.16
  • Accepted : 2019.09.05
  • Published : 2019.09.30
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Abstract

Recently, in urban areas, cavities and ground collapse adjacent to underground structures are frequently reported. Several studies on the cavity generation by structure cracks have been made, however they are focused on the cause of cracks and settlement of the ground. In this paper, soil particle and groundwater discharge through pipe cracks and cavity generation mechanism are investigated. The theoretical analysis of the groundwater, which is the main factor of the drainage of the soil particles, and the particle transport mechanism and flow characteristics were investigated. An experimental model test was carried out to identify the mechanism of cavity generation by underground buried pipe cracks. The soil particle weight of discharge through the cracks, and the movement characteristics of the particles were analyzed using PIV. In this study, it is clearly identified that soil particle movements, cavity generation and ground collapse that occur in the ground are basically caused by the movement of groundwater.

도시기반시설인 지중관거의 노후화가 심화되면서, 최근 도심지의 관거 주변에서 공동발생과 지반함몰 사례가 빈번하게 보고되고 있다. 지중관거 균열과 관련된 공동발생 및 지반함몰에 대해 많은 연구가 수행된 바 있으나, 기존 연구내용은 주로 관거의 균열 발생원인과 지반침하 거동에 집중되어 있다. 본 연구에서는 관거의 균열을 통한 지하수와 토립자 유출특성과 공동발생 메커니즘을 조사하였다. 또한, 토사유출로 인해 공동이 발생하고 지반함몰로 발전해가는 과정에 대한 가설을 수립하여 토립자 유출의 수리적 특성을 규명하고자 하였다. 관거 균열을 통한 토립자 유출 및 공동발생 메커니즘 규명을 위해 실내모형실험을 수행하였다. 모형실험으로부터 관거 균열을 통해 유출된 토립자를 측정하고, 실험과정을 영상촬영하여 PIV 분석을 통해 입자의 이동특성을 조사하였다. 본 연구를 통해 지중에서 발생하는 토립자의 이동, 공동발생 및 지반함몰 거동은 근본적으로 지하수의 이동에 의해 발생하는 것이며, 균열 위치와 관거 형상에 영향을 받음을 확인하였다.

Keywords

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