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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/nhess-2020-143
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2020-143
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 14 May 2020

Submitted as: research article | 14 May 2020

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This preprint is currently under review for the journal NHESS.

Experimental assessment of the relationship between rainfall intensity and sinkholes caused by damaged sewer pipes

Tae-Young Kwak1, Sang-Inn Woo2, Choong-Ki Chung3, and Joonyoung Kim4 Tae-Young Kwak et al.
  • 1Seismic Safety Research Center, Korea Institute of Civil Engineering and Building Technology, Goyang-si, Gyeonggi-do 10223, South Korea
  • 2Department of Architectural & Civil Engineering, Hannam University, Daedeok-gu, Daejeon 34430, South Korea
  • 3Department of Civil & Environmental Engineering, Seoul National University, Gwanak-gu, Seoul 08826, South Korea
  • 4Division of Smart Interdisciplinary Engineering, Hannam University,Daedeok-gu, Daejeon 34430, South Korea

Abstract. In several countries, the rising occurrence of sinkholes has led to severe social and economic damage. Based on the mechanism of sinkhole development, researchers have investigated the correlation between rainfall intensity and sinkholes caused by damaged sewer pipes. In this study, the effect of rainfall intensity on the formation of eroded zones, as well as the occurrence of sinkholes caused by soil erosion due to groundwater infiltration through pipe defects, has been analyzed through model tests. The ground in Seoul was adopted using weathered granite soil, which is generally used for backfill sewer pipes, and groundwater levels corresponding to three different rainfall intensity conditions were considered. The ground level changes and ground displacements were measured continuously, and the particle image velocimetry (PIV) algorithm was applied to measure the displacement at each position of the model ground. The results indicate that impeding the excessive rise of groundwater levels by securing sufficient sewage treatment facilities can effectively prevent the development of sinkholes caused by pipe defects.

Tae-Young Kwak et al.

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Tae-Young Kwak et al.

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Short summary
In this study, model tests were used to analyze the effects of rainfall intensity on the formation of the eroded zone and the occurrence of sinkholes due to groundwater infiltration through pipe defects. The model tests were conducted to simulate the actual site conditions considering the soil used around sewer pipe networks and the sewer pipe landfill standards. The groundwater level was applied to the model tests by setting three hydraulic heads based on the heavy rainfall characteristics.
In this study, model tests were used to analyze the effects of rainfall intensity on the...
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