Advances in Computational Design

  • 제3권3호
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  • Pages.269-288
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  • 2018
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  • 2383-8477(pISSN)
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  • 2466-0523(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A new approach to estimate the factor of safety for rooted slopes with an emphasis on the soil property, geometry and vegetated coverage

  • 투고 : 2018.06.23
  • 심사 : 2018.07.13
  • 발행 : 2018.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

180 different 2D numerical analyses have been carried out to estimate the factor of safety (FOS) for rooted slopes. Four different types of vegetated coverage and a variety of slope geometry considering three types of soil have been evaluated in this study. The highly influenced parameters on the slope's FOS are determined. They have been chosen as the input parameters for developing a new practical relationship to estimate the FOS with an emphasis on the roots effects. The dependency of sliding mode and shape considering the soil and roots-type has been evaluated by using the numerical finite element model. It is observed that the inclination and height of the slope and the coverage type are the most important effective factors in FOS. While the soil strength parameters and its physical properties would be considered as the second major group that affects the FOS. Achieved results from the developed relationship have shown the acceptable estimation for the roots slope. The extracted R square from the proposed relationship considering nonlinear estimation has been achieved up to 0.85. As a further cross check, the achieved R square from a multi-layer neural network has also been observed to be around 0.92. The numerical verification considering different scenarios has been done in the current evaluation.

키워드

참고문헌

  1. Baudin, C., De Vos, M. and Simpson, B. (2000), "Some considerations on the use of finite element methods in the ultimate state design", Proceedings of the International Workshop on Limit State Design in Geotechnical Engineering, Melbourne, U.S.A., June.
  2. Cano, A., Navia, R., Amezaga, I. and Montalva, J. (2002), "Local topoclimate effect on short-term cutslope reclamation success", Ecol. Eng., 18(4), 489-498. https://doi.org/10.1016/S0925-8574(02)00010-1
  3. Charlafti, M. (2014), "Slope stability and vegetation", J. Archit. Eng. Tech. 3(4), 1-8.
  4. Dawson, E.M., Roth, W.H. and Dresher, A. (2000), "Slope stability analysis by strength reduction", Geotechnique, 49, 835-840.
  5. DeGraff, J.W. (1989), "Landslide activity resulting from the November 1988 storm event in the southern Thailand and associated recovery needs". Safeguarding the Future; Restoration and Sustainable Development in the South of Thailand, National Economic and Social Development Board of Thailand and USAID, Bangkok, Thailand.
  6. Genet, M., Kokutse, N.K., Stokes, A., Fourcaud, T., Cai, X., Ji, J. and Mickovski, S., (2007), "Root reinforcement in plantation of Cryptomeria japonica D. Don: Effect of tree age and stand structure on slope stability", Forest Ecol. Manag., 256(8), 1517-1526. https://doi.org/10.1016/j.foreco.2008.05.050
  7. Gray, D.H. and Ohashi, H. (1983), "Mechanics of fiber reinforcement in sand", J. Geotech. Eng., 109(3), 335-351. https://doi.org/10.1061/(ASCE)0733-9410(1983)109:3(335)
  8. Griffith, D.V. and Lane, P.A. (1999), "Slope stability analysis by finite elements", Geotechnique, 49(3), 387-403. https://doi.org/10.1680/geot.1999.49.3.387
  9. Ji, J., Kokutse, N., Genet, M., Forcaud, T. and Zhang, Z. (2012), "Effect of spatial variation of tree root characteristics on slope stability. A case study on Black Locust (Robiniapseudacacia) and Arborvitae (Platycladusorientalis) stands on the Loess Plateau, China", Catena, 92, 139-154. https://doi.org/10.1016/j.catena.2011.12.008
  10. Kokutse, N., Temgoua, A.G. and Kavazovic, Z. (2016), "Slope stability and vegetation: Conceptual and numerical investigation of mechanical effects", Ecol. Eng., 86, 146-153. https://doi.org/10.1016/j.ecoleng.2015.11.005
  11. Kokutse, N.K. (2003), "Analyse Numerique de L'effet Mecanique de la Vegetation Surla Stabilite des Sols en Pente", Universite de Lome, Lome, Togo.
  12. Kokutse, N.K. (2008), "Modelisation du Renforcement des Sols et Analyse Numeriquede L'impact de la Structure des Peuplements Forestiers Sur la Stabilite des Pentes", Ph.D. Dissertation, Universite Bordeaux 1, Bordeaux, France.
  13. Maedeh, P., Ghanbari, A. and Wu, W. (2016), "Analytical assessment of elevated tank natural period considering soil effects", Coupled Syst. Mech., 5(3), 223-234. https://doi.org/10.12989/csm.2016.5.3.223
  14. Maedeh, P., Ghanbari, A. and Wu, W. (2017a), "New coefficients to find natural period of elevated tanks considering fluid-structure-soil interaction effects", Geomech. Eng., 12(6), 949-963. https://doi.org/10.12989/gae.2017.12.6.949
  15. Maedeh, P., Ghanbari, A. and Wu, W. (2017b), "Estimation of elevated tanks natural period considering fluid-structure-soil interaction by using new approaches", Earthq. Struct., 12(2), 145-152. https://doi.org/10.12989/eas.2017.12.2.145
  16. Matsui, T. and San, K.C. (1992), "Finite element slope stability analysis by shear strength reduction technique", Soils Found, 32(1), 59-70. https://doi.org/10.3208/sandf1972.32.59
  17. Nilaweera, N.S. and Nutalaya, P. (1999), "Role of tree roots in slope stabilisation", Bull. Eng. Geol. Environ., 57(4), 337-342. https://doi.org/10.1007/s100640050056
  18. O'Loughlin, C.L. (1974), "The effects of timber removal on slope stability of forest soils", J. Hydrol., 121-134.
  19. Operstein, V. and Frydman, S. (2000), "The influence of vegetation on soil strength", Ground Improv., 4(2), 81-89. https://doi.org/10.1680/grim.2000.4.2.81
  20. Pretzsch, H. (2010), Forest Dynamics, Growth and Yield: From Measurement to Model, Springer, Berlin, Germany.
  21. Pretzsch, H., Biber, P. and Dursky, J. (2002), "The single tree-based stand simulator SILVA: construction, application and evaluation", Forest Ecol. Manag., 162(1), 3-21. https://doi.org/10.1016/S0378-1127(02)00047-6
  22. Pretzsch, H., Biber, P., Schutze, G., Uhl, E. and Rotzer, T. (2014), "Forest stand growth dynamics in Central Europe have accelerated since 1870", Nat. Commun., 5, 4967. https://doi.org/10.1038/ncomms5967
  23. Rienstenberg, M.M. (1987), "Anchoring of thin colluvium on hillslopes by roots of sugar maple and white ash", Ph.D. Dissertation, University of Cincinnati, Cincinnati, U.S.A.
  24. Rocscience Inc. (2001), "Application of the finite elements methods to slope stability", Toronto, Canada.
  25. Sommers, L., Loehr, J.E. and Bowders, J.J. (2000), "Construction methods for slope stabilization with recycled plastic pins", Proceedings of the Mid-Continent Transportation Symposium, Iowa, U.S.A., May.
  26. Stokes, A., Atger, C., Bengough, A.G., Fourcaud, T. and Sidle, R.C. (2009), "Desirable plant root traits for protecting unstable slopes against landslides", Plant Soil, 324, 1-30. https://doi.org/10.1007/s11104-009-0159-y
  27. Swanston, D.N. (1974), "Slope stability problems associated with timber harvesting in mountainous regions of western United States", PNW-GTR-021; USDA Forest Service, U.S.A.
  28. Terzaghi, K. (1950), Mechanism of Landslides, Harvard University, New York, U.S.A.
  29. Van Beek, L.P.H., Wint, J., Cammeraat, L.H. and Edwards, J.P. (2005), "Observation and simulation of root reinforcement on abandoned Mediterranean slopes", Plants Soil, 278, 55-74. https://doi.org/10.1007/s11104-005-7247-4
  30. Waldron, L.J. (1977), "The shear resistance of root permeated homogeneous and stratified soil", Soil Sci. Soc. Am. J., 41(3), 843-849. https://doi.org/10.2136/sssaj1977.03615995004100050005x
  31. Waldron, L.J. and Dakessian, S. (1981), "Soil reinforcement by roots: Calculation of increased soil shear resistance from roots properties", Soil Sci., 132(6), 427-435. https://doi.org/10.1097/00010694-198112000-00007
  32. Wu, T.H. (1995), "Slope stabilization", Slope Stabilization and Erosion Control: A Bioengineering Approach, Chapman and Hall, University Press, Cambridge, United Kingdom.
  33. Wu, T.H., McOmber, R.M., Erb, R.T. and Beal, P.E. (1988), "Study of soil root interaction", J. Geotech. Eng., 114(12), 1351-1375. https://doi.org/10.1061/(ASCE)0733-9410(1988)114:12(1351)
  34. Wu, W. and Sidle, R.C. (1995), "A distributed slope stability model for steep forested hillslopes", Water Resour. Res., 31(8), 2097-2110. https://doi.org/10.1029/95WR01136
  35. Xie, M., Esaki, T. and Cai, M. (2004), "A GIS-based method for locating the critical 3D slip surface in a slope", Comput. Geotech., 31(4), 267-277. https://doi.org/10.1016/j.compgeo.2004.03.003
  36. Zhou, J., Fua, B., Gao, G., Lua, Y., Liu, Y., Lua, N. and Wang, S. (2015), "Effects of precipitation and restoration vegetation on soil erosion in a semi-arid environment in the Loess Plateau, China", Catena, 137, 1-11.