Browse > Article
http://dx.doi.org/10.7843/kgs.2016.32.12.33

Understanding of Subsurface Cavity Mechanism due to the Deterioration of Buried Pipe  

Lee, Dae-Young (Geotechnical Engineering Research Division, KICT)
Cho, Nam-Kak (Civil Estimation/Design Team Samsung C&T)
Publication Information
Journal of the Korean Geotechnical Society / v.32, no.12, 2016 , pp. 33-43 More about this Journal
Abstract
In order to analyze ground relaxation and cavity formation mechanism due to deteriorated sewer pipe, field test was carried out and a numerical assessments were compared with the field test results. An artificial underground cavity was intended using the ice block overlaying the buried pipe and confirmed that the cavity and relaxation of the surrounding ground were gradually formed as the ice block starts to melt down. Such mechanism was highly suspected to be involved with soil particle interlocking as a soil compaction was a typical process for the buried pipes. In exploring such mechanism numerically, commercially available DEM (Discrete Element Method) code PFC2D was used and the interlocking induced cavern behaviors were successfully simulated and compared with field test results by utilizing the clump logic imbedded in PFC code.
Keywords
Sinkhole; Ice cavity; DEM; PFC; Flowable Fill; Cavity formation mechanism; Sewer pipe;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Kuwano, K., Mari, S., and Ryoko, S. (2010), "Study on the Detection of Underground Cavity and Ground Loosening for the Prevention of Ground Cave-in Accident", Journal of Japan Geotechnical Society, Vol.5, No.2, pp.219-229.   DOI
2 Lee, D. Y., Kim, D. M., Yoo. Y. S., and Han, J. G. (2015), "Development and Application of Backfill Material for Reducing Ground Subsidence", Journal of the Geosynthetics Society, Vol. 14, No.4, pp.147-158.   DOI
3 Oh, D. W., Kong, S. M., Lee, D. Y., Yoo, Y. S., and Lee, Y. J. (2015), "Effect of Reinforced Pseudo-Plastic Backfill on the Behavior of Ground around Cavity Developed due to Sewer Leakage, Journal of the Korean Geo-Environmental Society, Vol.16, No.12, pp.13-22.
4 Seoul Seokchon-dong Cavity Cause Investigation Committee (2014), Investigation of cause for load sinkage in Seoul city, Seoul, Korea.
5 Cho, N., Martin, C. D., and Sego, D. C. (2007), "A Clumped Particle Model for Rock", International Journal of Rock Mechanics & Mining Science, Vol.44, No.7, pp.997-1010.   DOI
6 Cho, N. K., Yoo, C. S., and Lee, D. Y. (2008), "Modeling Direct Shear Test of Crushed Stone using DEM", Journal of Korean Geotechnical Society, Vol.24, No.1, pp.15-23.
7 Itasca Consulting Group (1995), PFC2D User's Manual, Version 3.1. Minneapolis, Minnesota: Itasca Cons. Group. 3. Itasca Consulting Group, Inc.
8 Geological solution (2014), Subsoil Investigation Report.