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http://dx.doi.org/10.7855/IJHE.2018.20.1.019

Experimental Study on Road-Subsidence Characteristics in Unsaturated Sandy Soils  

Kweon, Gichul (Department of Civil Engineering, Dongeui University)
Publication Information
International Journal of Highway Engineering / v.20, no.1, 2018 , pp. 19-25 More about this Journal
Abstract
PURPOSES : The purpose of this study is to identify the road-subsidence mechanism in unsaturated sandy soils. METHODS : A series of soil chamber tests were conducted under various conditions. RESULTS : The cavity-expansion characteristics in unsaturated sandy soils due to seepage were affected by the outlet size, seepage intensity, relative density, and fine content. CONCLUSIONS : In unsaturated sandy soils, the cavity-expansion speed was affected by the outlet size, relative density, seepage intensity, and clay content; however, the cavity-expansion shape was very similar. As the outlet size and seepage intensity increased, the cavity-expansion speed increased. As the relative density increased, the cavity-expansion speed increased because of a sudden decrease in shear strength, resulting from the increased saturation (reduction of matric suction). The cavity expanded faster with the increasing clay content, up to a certain threshold. It expanded at a slower rate once it passed the threshold. Finally, it reached a stable state where the cavity did not expand due to seepage.
Keywords
Road subsidence; unsaturated sandy soil; cavity; soil-chamber test; seepage;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 AASHTO (2002). "AASHTO guide for design of new and rehabilitated pavement structures", AASHTO, Washington D.C.
2 Fredlund D. G. and Morgenstem N. R. (1977). "Stress state vriables for unsaturated soils", ASCE J. Geotech. Eng. Div., GT5, vol. 103, pp.447-466.
3 Hewage I. and Renuka S. (2012). "Evaluation of ground loosening behavior and mechanical properties of loosened sand associated with underground cavities", U Tokyo Repository.
4 Sato M. and Kuwano R. (2013). "Effects of buried structures on the formation of underground cavity" Proceedings on the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, pp.1769-1772.
5 Seoul City (2015). "Mechanism of Cavity Development and Countermeasures for the Prevention of Cave-in in Road"(in Korean).
6 Kweon, G. C. (2004). "Freezing and thawing characteristics of subgrade soils in Korea", Journal of the Korean Society of Civil Engineers, Vol. 24, 2-D, pp.213-219.
7 Kim Y. and Park S. W. (2017). "DEM simulation on the initiation and development of road subsidence", Journal of the Korean Geotechnical Society, Vol. 33, No. 7, pp.43-53 (in Korean).   DOI
8 Kuwano R., Kohata Y. and Sato M. (2012). "A case study of ground cave-in due to large scale subsurface erosion in old land fill" ICSE 6, Paris, pp.265-271.
9 Kuwano R. and Sato M. (2009). "Basic study for prevention of ground cave-in; 地盤陷沒未然防止のための基礎的檢討" 生産硏究(硏究速報), Vol. 61, No. 4, pp.673-677.
10 Kuwano R., Yamauchi, K., Horii T. and Kohashi H. (2006). "Defects of sewer pipes causing cave-in's in the road" Proceeding of 6th International Symposium on New Technologies for Urban Safety of Mega Cities in Asia. Phuket : No. H63.
11 Kweon, G. C. (2004). "Development of whole strain range constitutive model considering deformational characteristics of subbase materials in Korea", Journal of Korean Society of Road Engineers, Vol. 6, No. 3, pp.65-77 (in Korean).
12 Kweon G. C., Kim S. L. and Hong S. W. (2016). "Basic study on mechanism of cave-in in road through laboratory model tests", International Journal of Highway Engineering, Vol. 18, No, 5, pp.11-19 (in Korean).   DOI
13 Lee, S. J. (2004). "Evaluation of shear strength and soil-water characteristics curve of unsaturated weathered granite soils", Ph. D. Dissertation, KAIST.
14 Kim Y., Kim J. B., Kim D. and Han J. G. (2017). "Experimental study on generating mechanism of the ground subsidence of due to damaged waters Supply pipe", Journal of Korean Geosynthetics Society, Vol. 16, No. 2, pp.139-148 (in Korean).