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2017 Vol.16, Issue 2 Preview Page
Experimental Study on Generating mechanism of The Ground Subsidence of Due to Damaged Waters supply Pipe.

상수관로 파손으로 인한 지반함몰 발생메카니즘에 관한 실험적 연구

Youngho Kim1
,
Joo-Bong Kim2
,
Dowon Kim3
,
Jung-Geun Han4*
김 영호1
,
김 주봉2
,
김 도원3
,
한 중근4*
1Nonmember, Master’s course, School of Civil and Environmental Engineering, Chung-Ang Univ
2Nonmember, Master’s course, School of Civil and Environmental Engineering, Chung-Ang Univ
3Nonmember, Bachelor’s course, School of Civil and Environmental Engineering, Chung-Ang Univ
4Member, Professor, School of Civil and Environmental Engineering, Urban Design and Study, Chung-Ang Univ.
*교신저자. *Corresponding Author. 
30 June 2017. pp. 139-148
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Abstract

Ground subsidence caused by damaged water pipe and sewer is recently increasing due to the aging of city and pipeline in many city. Although many recent studies have verified characteristics of ground subsidence due to wastewater pipe breakdown, research about characteristics of ground subsidence due to water pipe is insignificant. subsidence due to water pipe is insignificant. This study aims to identify the ground failure mechanism caused by water and sewer pipe breakdown. Accordingly, we conducted an indoor model experiment to verify characteristics of ground subsidence considering characteristics of ground and ground failure. The water pipe pressure and velocity head was considered to find out ground subsidence mechanism. Also comparative analysis is conducted by analyzing relative density and fine-grain content considering embedded condition of water pipe. When the relative density and seepage pressure is low, small scale ground subsidence can occur, but when the conditions are opposite, ground subsidence occur in large scale and expands to ground level over time. Furthermore, it is acknowledgeable that ground cavity that is formed after soil run off due to seepage in deep earth, maintains steady strength and stays on the ground level for long period.

Keywords
Lab. test
Relative density
Seepage pressure
Ground Subsidence
Cavity
Water pipe.

상하수도관의 파손에 따라 발생하는 지반함몰은 최근 많은 도시에서 증가하고 있다. 이는 도시의 노후화에 따른 파이프라인의 노후화에 기인한다. 하수도의 파손에 따른 지반함몰특성은 최근 많은 연구들을 통해 밝혀지고 있지만, 상수도에 의한 지반함몰 특성 연구는 미진한 상태라 할 수 있다. 본 연구에서는 상수도관의 파손에 따른 매설관 상부지반의 지반함몰 발생메카니즘을 알아보기 위해 지반특성과 상수도관에서의 압력 및 속도수두에 따른 지반붕괴특성을 실내모형시험을 통해 고찰하였다. 상수도 관의 매설상태를 고려하여 상대밀도와 세립토의 함유량에 따라 비교분석하였다. 상대밀도와 침투압이 작은 경우에는 소규모지 반함몰이 발생할 수 있고, 반대인 경우에는 지중공동이 크게 발생하면서 일정시간이 지난 후 지표면으로 확대되어 발생하는 것을 알 수 있었다. 또한, 지중 깊은 곳에서 침투압에 의한 토사유출이 발생한 이후 형성된 지반공동은 장시간동안 지표면 부근에서 일정한 강도를 유지하고, 지반공동이 장기간 유지될 수 있음을 알 수 있었다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 16
  • No :2
  • Pages :139-148
  • Received Date : 2017-06-02
  • Revised Date : 2017-06-19
  • Accepted Date : 2017-06-21
  • DOI :https://doi.org/10.12814/jkgss.2017.16.2.139
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