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http://dx.doi.org/10.7843/kgs.2013.29.12.77

An Effective Stress Analysis of Unsaturated Slope Failures by Rainfall Infiltration  

Lee, Young-Huy (Dept. of Civil Engrg., Yeungnam Univ.)
Oh, Se-Boong (Dept. of Civil Engrg., Yeungnam Univ.)
Jin, In-Chul (Dept. of Civil Engrg., Yeungnam Univ.)
Kim, Jun-Woo (Kunil Engrg.)
Park, Yeong-Mog (Dept. of Civil Engrg., Yeungnam Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.29, no.12, 2013 , pp. 77-85 More about this Journal
Abstract
Unsaturated slopes experience infiltration during rainfall and become unstable when saturated. On the viewpoint of unsaturated effective stress, as matric suction decreases, both effective stress and shear strength decrease, which declines slope stability consequently. This study is focused on describing effective stress based on suction stress. The actual slope failures are simulated to calculate factors of safety in the field of finite element stress. In the residual soils of Hadong and Pohang, unsaturated properties are evaluated by laboratory tests. For unsaturated slopes, analyses of infiltration, stress and stability were performed to simulate actual failures. Based on unsaturated effective stress principle, the stability of actual slopes could be evaluated successfully. It is verified for the effective stress concept to be applicable to the engineering practice on slope design which considers infiltration by rainfall.
Keywords
Effective stress; Suction stress; Rainfall infiltration; Slope stability; Unsaturated soils;
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  • Reference
1 GEO-SLOPE (2007a), Stress-Deformation Modeling with SIGMA/W 2007, GEO-SLOPE International Ltd, Canada.
2 GEO-SLOPE (2007b), Seepage Modeling with SEEP/W 2007, GEO-SLOPE International Ltd, Canada.
3 GEO-SLOPE (2007c), Stability Modeling with SLOPE/W 2007, GEO-SLOPE International Ltd, Canada.
4 Griffiths, D.V. and Lane, P.A. (1999), "Slope stability analysis by finite elements", Geotechnique 49(3), 387-403.   DOI   ScienceOn
5 Iverson, R.M. (2000), "Landslide triggering by rain infiltration", Water Resources Research 36(7), 1897-1910.   DOI   ScienceOn
6 Janbu, N. (1954), "Applications of composite slip surfaces for stability analysis", Proceedings of the European Conference on the Stability of Earth Slopes, Stockholm, 3, pp.39-43.
7 Lu, N. and Likos, W. J. (2006), "Suction stress characteristic curve for unsaturated soils", Journal of Geotechnical and Geoenvironmental Engineering, 132(2), pp.131-142.   DOI   ScienceOn
8 Lu, N., Godt, J., and Wu, D. T. (2010), "A closed-form equation for effective stress in unsaturated soil", Water Resources Research, Vol.46, doi:10.1029/2009WR008646, 1-14.   DOI   ScienceOn
9 Lu, N., Kaya, M., Collins, B.D., and Godt, J.W. (2013), "Hysteresis of hydromechanical properties of a silty soil," Journal of Geotechnical and Geoenvironmental Engineering, 139(3), pp.507-510.   DOI
10 Lu, N., Wayllace, A., and Oh, S. (2013), "Infiltration-induced seasonally reactivated instability of a highway embankment near the Eisenhower Tunnel, Colorado, USA", Engineering Geology, 162, pp.22-32.   DOI   ScienceOn
11 Oh, S., Lu, N., Kim, Y. K., Lee, S. J., and Lee, S. R. (2012), "Relation between the soil water characteristic curve and the suction stress characteristic curve: experimental evidence from tests on residual soils," Journal of Geotechnical and Geoenvironmental Engineering, 138(1), pp.47-57.   DOI   ScienceOn
12 Oh, S., Lu, N., Kim, T.-K., and Lee, Y. H. (2012), "Experimental Validation of Suction Stress Characteristic Curve from Nonfailure Triaxial $K_0$ Consolidation Tests", Journal of Geotechnical and Geoenvironmental Engineering, 139(9), pp.1490-1503.
13 van Genuchten, M. T. (1980), "A closed-form equation for predicting the hydraulic conductivity of unsaturated soils", Soil Science Society of America Journal, 44, pp.892-898.   DOI   ScienceOn
14 van Genuchten, M. T., Leij, F. J., and Yates, S. R. (1991), The RETC Code for Quantifying the Hydraulic Functions of Unsaturated Soils, EPA 600/2-91/065.
15 Integrated Groundwater Information Service, www.gims.go.kr (In Korean) 국가지하수정보센터 홈페이지, www.gims.go.kr
16 Daily rainfall record data, Korea Meteorological Administration, www.kma.go.kr/weather/observation/past_table.jsp?stn=108&yy=2013&obs=21&x=7&y=14 (In Korean) 기상청 홈페이지, 지상관측자료, www.kma.go.kr/weather/observation/past_table.jsp?tn=108&yy=2013&obs=21&x=7&y=14
17 Korea Infrastructure Safety Corporation (2011), Design guide on engineered slopes. (In Korean) 한국시설안전관리공단 (2011), 건설공사 비탈면 설계기준(안).
18 Bishop, A. W. (1954), "The use of pore water coefficients in practice", Geotechnique, 4(4), pp.148-152.   DOI
19 Bishop, A. W. (1959), "The principle of effective stress", Teknisk Ukeblad I Samarbeide Med Teknikk, Oslo, Norway, 106(39), pp. 859-863.
20 Casagli, N., Dapporto, S., Ibsen, M., Tofani, V., and Vannocci, P. (2005), Analysis of the landslide.
21 Crosta, G.B. and Frattini, P. (2003), Distributed modelling of shallow landslides triggered by intense rainfall. Natural Hazards and Earth System Sciences 3, 81-93.   DOI
22 Dawson, E.M., Roth, W.H., and Drescher, A. (1999), "Slope stability analysis by strength reduction", Geotechnique 49(6), 835-840.   DOI   ScienceOn
23 Duncan, J.M. and Wright, S.G. (2005), "Soil Strength and Slope Stability", John Wiley & Sons Inc, N.J., p.309.
24 Fellenius, W. (1936), "Calculation of the stability of earth dams." Transactions of the 2nd Congress on Large Dams, Washington, D.C., 4, pp.445-463.