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A Study for Influence Range of Ground Surface due to Sewer Fracture in Various Relative Density of Sand by Laboratory Model Test

실내모형시험을 통한 상대밀도가 다양한 사질토 지반에서의 하수도관 파손에 따른 지표침하의 영향범위에 관한 연구

Dong-Wook Oh1
,
Ho-Yeon Ahn1
,
Yong-Joo Lee2*
오 동욱1
,
안 호연1
,
이 용주2*
1Master’s Course, Dept. of Civil Engrg., Seoul National Univ. of Science & Technology
2Prof., Dept. of Civil Engrg., Seoul National Univ. of Science & Technology
1서울과학기술대학교 건설시스템공학과 석사과정
2서울과학기술대학교 건설시스템공학과 교수
*교신저자. *Corresponding Author. 
28 February 2016. pp. 19-30
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Abstract

It is well known that water leakage from decrepit sewer pipe mainly causes frequent occurrence of ground subsidence in urban area. Thus, laboratory model tests were carried out to investigate ground behaviour according to location of sewer fracture and various relative densities of surrounding soil. The portion of fractured pipe was assumed to be 20% compared to the circumference of pipe, and to be positioned at the top and bottom of the pipe. Ground conditions were made as loose sand (=30%) and dense sand (=70%). In addition, comparison and analysis with results of model tests were carried out by Finite Element analysis. As a result, not only water leakage from the bottom of pipe  (scenario 2) caused greater ground behaviour than leakage from the top of pipe (scenario 1), but also much greater surface settlement occurred when the ground condition is loose.

Keywords
Ground subsidence
Settlement
Relative density
Sewer pipe
Model test
Numerical analysis

도심지 지반함몰 현상의 대부분이 노후된 하수관에 의해 발생한다는 것은 이미 잘 알려진 사실이다. 따라서 관 파손의 위치와 주변 지반의 상대밀도가 지반의 거동에 미치는 영향을 알아보기 위해 실내모형시험을 수행하였다. 관 파손은 관 둘레에 대해 20% 파손된 것으로 가정하여 관 상부에 파손이 발생한 경우와 하부에 발생한 경우로 고려하였다. 느슨한 지반과 조밀한 지반을 상대밀도 30%, 70%로 조성하여 관 파손의 위치에 따른 지반 거동을 측정하였을 뿐만 아니라, 유한요소해석을 이용하여 실내모형시험 결과와 비교･분석하였다. 관 하부가 파손되어 누수가 발생되는 것이 상부가 파손되는 것보다 더 큰 지반 거동을 유발하는 것으로 나타났을 뿐만 아니라, 느슨한 지반에서 더 큰 지표침하량이 발생하는 것을 알 수 있었다.

References
1
1.Atkinson, J.H. and Mair, R.J. (1981), “Soil Mechanics Aspects of Soft Ground Tunnelling”, Ground Engineering, July, pp.20-26.
2
2.Bolton, M.D. (1986), “The Strength and Dilatancy of Sands”, Géotechnique, 36, No.1, pp.65-78.
3
3.Cording, E.J. and Hansmire, W.H. (1975), “Displacements around Soft Ground Tunnels - General Report. In: 5th Pan American Conference on Soil Mechanics and Foundation Engineering”, Buenos Aires, Session IV, pp.571-632.
4
4.Das, B.M. (2009), “Principles of Geotechnical Engineering (7th Edition)”, USA, CENGAGE Learning, pp.302-367.
5
5.JoongAng-Ilbo (2015), Songpa, Guro-Sand Ground, Jongno-Old Sewerage, A danger zone of ground subsidence, JoongAng-Ilbo, Seoul, pp.10. (in Korean)
6
6.Kim, Y.S., Ko, H.W., Kim, J.H., and Lee, J.G. (2012), “Dynamic Deformation Characteristics of Joomunjin Standard Sand Using Cyclic Triaxial Test”, Journal of the Korean Geotechnical Society, Vol.28(12), pp.53-64. (in Korea)
7
7.Kong, S.M. (2015), A Study on Embedded Pile Behaviour at Tunnel Crown Area due to Tunnelling MSc thesis, Seoul National University of Science and Technology, Seoul, 35-36.
8
8.Kuwano, R., Sato, M., and Sera, R. (2010), “Study on the Detection of Underground Cavity and Ground Loosening for the Prevention of Ground Cave-in Accident”, Japanese Geotechnical Journal, Vol.5, No.2, pp.219-229.
9
9.Leblais, Y. and Bochon, A. (1991), “Villejust Tunnel: Slurry Shield Effects on Soils and Lining behaviour and Comments on Monitoring Requirement”, Tunnelling’91, London. IMM, pp.65-77.
10
10.Lambe, T.W. and Whitman, R.V. (1979), Soil Mechanics, John Wiley & Sons, pp.31.
11
11.Pantet, A. (1991), Creusement de galeries a` faible profondeur a` l’aide d’un tunnelier a` pression de boue; mesures in situ et e´tude the´onique du champs de de´placements, These de doctorat, INSA, Lyon.
12
12.PLAXIS AE (2013), Reference manual. pp.1-307.
13
13.Terzaghi K. (1936), “Stress Distribution in Dry and Saturated Sand Above a Yielding Trap-door”, Proceedings of International Conference of Soil Mechanics, Havard University, Cambridge (USA), 1, pp. 307-311.
14
14.Thiansky, A.B. (1999), Sinkhoes, West-Central Florida, Land subsidence in the United States, U.S.Geological Survey Circular 1182, pp.121-140.
15
15.Tsukada, Y., Miura, K., Tsubokawa, Y., Ishito, M., Nishimura, N., Otani, Y., and You, G.L. (1999), “Experimental Investigation on the Improvement of Bearing Capacity of Surface Footing with Micropiles”,  Proceedings of the 2nd International workshop on Micropiles, September, Ube city, Japan. pp.139-148.
16
16.Water Journal (2014), A counterplan of ground settlement due to water supply and sewerage, Water Journal, Seoul, Vol.124, pp.66-87.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 32
  • No :2
  • Pages :19-30
  • Received Date : 2015-12-24
  • Revised Date : 2016-02-04
  • Accepted Date : 2016-02-25
  • DOI :https://doi.org/10.7843/kgs.2016.32.2.19
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