Smart Structures and Systems

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Real-time unsaturated slope reliability assessment considering variations in monitored matric suction

  • Received : 2010.06.11
  • Accepted : 2010.08.24
  • Published : 2011.04.25
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Abstract

A reliability-based slope stability assessment method considering fluctuations in the monitored matric suction was proposed for real-time identification of slope risk. The assessment model was based on the limit equilibrium model for infinite slope failure. The first-order reliability method (FORM) was adopted to calculate the probability of slope failure, and results of the model were compared with Monte-Carlo Simulation (MCS) results to validate the accuracy and efficiency of the model. The analysis shows that a model based on Advanced First-Order Reliability Method (AFORM) generates results that are in relatively good agreement with those of the MCS, using a relatively small number of function calls. The contribution of random variables to the slope reliability index was also examined using sensitivity analysis. The results of sensitivity analysis indicate that the effective cohesion c' is a significant variable at low values of mean matric suction, whereas matric suction ($u_a-u_w$) is the most influential factor at high mean suction values. Finally, the reliability indices of an unsaturated model soil slope, which was monitored by a wireless matric suction measurement system, were illustrated as 2D images using the suggested probabilistic model.

Keywords

References

  1. Babu, G.L.S. and Singh, V.P. (2010), "Reliability analyses of a prototype soil nail wall using regression models", Geomech. Eng., 2(2), 71-88. https://doi.org/10.12989/gae.2010.2.2.071
  2. Bennet, P.J., Soga, K., Wassell, I., Fidler, P., Abe, K., Kobayashi, Y. and Vanicek, M. (2010), "Wireless sensor networks for underground railway application: case studies in Prague and London", Smart Struct. Syst., 6(5-6), 619-639. https://doi.org/10.12989/sss.2010.6.5_6.619
  3. Brand, E.W., Premchitt, J. and Phillipson, H.B. (1984), "Relationship between rainfall and landslides", Proceedings of the 5th Int. Symp. on Landslides, Toronto, September.
  4. Catbas, F.N., Susoy, M. and Frangopol, D.M. (2008), "Structural health monitoring and reliability estimation: long span truss bridge application with environmental monitoring data", Eng. Struct., 30(9), 2347-2359. https://doi.org/10.1016/j.engstruct.2008.01.013
  5. Cho, S.E. and Lee, S.R. (2001), "Instability of unsaturated soil slopes due to infiltration", Comput. Geotech., 28(3), 185-208. https://doi.org/10.1016/S0266-352X(00)00027-6
  6. Chong, P.C., Phoon, K.K. and Tan, T.S. (2000), "Probabilistic analysis of unsaturated residual soil slopes", Proceedings of the Applications of Statistics and Probability (ICASP 7), Rotterdam, Balkema.
  7. Christian, J.T., Ladd, C.C. and Baecher, G.B. (1994), "Reliability applied to slope stability analysis", J. Geotech. Geoenviron., 120(12), 2180-2207.
  8. Christian, J.T. (2004), "Geotechnical engineering reliability: how well do we know what we are doing?", J. Geotech. Geoenviron., 130(10), 985-1003. https://doi.org/10.1061/(ASCE)1090-0241(2004)130:10(985)
  9. Cornell, C.A. (1971), "First-order uncertainty analysis of soils deformation and stability.", Proceedings of the 1stInternational Conference on Application of Probability and Statistics in Soil and Structural Engineering (ICAPI), Hong Kong.
  10. El-Ramly, H., Morgenstern, N.R. and Cruden, D.M. (2002), "Probabilistic slope stability analysis for practice", Can. Geotech. J., 39(3), 665-683. https://doi.org/10.1139/t02-034
  11. Frangopol, D.M., Strauss, A. and Kim, S. (2008), "Bridge reliability assessment based on monitoring", J. Bridge Eng, 13(3), 258-270. https://doi.org/10.1061/(ASCE)1084-0702(2008)13:3(258)
  12. Fredlund, D.G. and Dahlman, A.E. (1971), "Statistical geotechnical properties of glacial lake Edmonton sediments", Proceedings of the First International Conference on Applications of Statistics & Probability to Soil & Structural Engineering, Hong Kong.
  13. Fredlund, D.G., Morgenstern, N.R. and Widger, R.A. (1978), "The shear strength of unsaturated soils", Can. Geotech. J., 15(3), 313-321. https://doi.org/10.1139/t78-029
  14. Fredlund, D.G., Rahardjo, H. and Gan, J.K.M. (1987), "Nonlinearity of strength envelope for unsaturated soils", Proceedings of the 6th International Conference on Expansive Soils, New Delhi, India.
  15. Fredlund, D.G. and Rahardjo, H. (1993), Unsaturated soil mechanics, Wiley, New York.
  16. Gasmo, J., Hritzuk, K.J., Rahardjo, H. and Leong, E.C. (1999), "Instrumentation of an unsaturated residual soil slope", Geotech. Test. J., 22(2), 134-143. https://doi.org/10.1520/GTJ11272J
  17. Glaser, S.D. (2004), "Some real-world applications of wireless sensor nodes", Proceedings of the SPIE, San Diego, CA, March.
  18. Hasofer, A.M. and Lind, N. (1974), "Exact and invariant second-moment code format", J. Eng. Mech., 100(1), 111-121
  19. Hassan, A.M. and Wolff, T.F. (1999), "Search algorithm for minimum reliability index of earth slopes", J. Geotech. Geoenviron., 125(4), 301-308. https://doi.org/10.1061/(ASCE)1090-0241(1999)125:4(301)
  20. Hohenbichler, M. and Rackwitz, R. (1986), "Sensitivity and importance measures in structural reliability", Civil Eng. Syst., 3(4), 203-209. https://doi.org/10.1080/02630258608970445
  21. Kim, Y.K. and Lee, S.R. (2010), "Field infiltration characteristics of natural rainfall in compacted roadside slopes", J. Geotech. Geoenviron., 136(1), 248-252. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000160
  22. Li, A.G., Yue, Z.Q., Tham, L.G., Lee, C.F. and Lwa, K.T. (2005), "Filed-monitored variations of soil moisture and matric suction in a saprolite slope", Can. Geotech. J., 42, 13-26. https://doi.org/10.1139/t04-069
  23. Li, K.S. and Lumb, P. (1987), "Probabilistic design of slopes", Can. Geotech. J., 24(4), 520-535. https://doi.org/10.1139/t87-068
  24. Li, M. and Liu, Y. (2007), "Underground structure monitoring with wireless sensor networks", Proceedings of the 6th international conference on information processing in sensor networks, ACM, New York.
  25. Lim, T.T., Rahardjo, H., Chang, M.F. and Fredlund, D.G. (1996), "Effect of rainfall on matric suctions in a residual soil slope", Can. Geotech. J., 33, 618-628. https://doi.org/10.1139/t96-087
  26. Low, B.K. and Tang, W.H. (1997), "Reliability analysis of reinforced embankments on soft ground", Can. Geotech. J., 34, 672-685. https://doi.org/10.1139/t97-032
  27. Lumb, P. (1962), "Effect of rainstorms on slope stability", Proceedings of the Symp. on Hong Kong Soils, Hong Kong.
  28. Phoon, K.K. and Kulhawy, F.H. (1999), "Evaluation of geotechnical property variability", Can. Geotech. J., 36(4), 625-639. https://doi.org/10.1139/t99-039
  29. Phoon, K.K., Santoso, A. and Quek, S.T. (2010), "Probabilistic analysis of soil-water characteristic curve", J. Geotech. Geoenviron., 136, 445-455 https://doi.org/10.1061/(ASCE)GT.1943-5606.0000222
  30. Rahardjo, H., Lim, T.T., Chang, M.F. and Fredlund, D.G. (1994), "Shear-strength characteristics of a residual soil", Can. Geotech. J., 32, 60-77.
  31. Rahardjo, H., Meilani, I., Leong, E.C. and Rezaur, R.B. (2009), "Shear strength characteristics of a compacted soil under infiltration conditions", Geomech. Eng., 1(1), 35-52. https://doi.org/10.12989/gae.2009.1.1.035
  32. Roy, D., Chiranjeevi, K., Sigh, R. and Baidya, D.K. (2009), "Rainfall induced instability of mechanically stabilized earth embankments", Geomech.Eng., 1(3), 193-204. https://doi.org/10.12989/gae.2009.1.3.193
  33. Rubio, E., Hall, J.W. and Anderson, M.G. (2004), "Uncertainty analysis in a slope hydrology and stability model using probabilistic and imprecise information", Comput. Geotech., 31(7), 529-536. https://doi.org/10.1016/j.compgeo.2004.09.002
  34. Tsaparas, I., Rahardjo, H., Toll, D.G. and Leong, E.C. (2002), "Controlling parameters for rainfall-induced landslides", Comput. Geotech., 29(1), 1-27. https://doi.org/10.1016/S0266-352X(01)00019-2
  35. U.S. Army (1993), "Reliability assessment of navigation structures: stability assessment of existing gravity structures",Engr. Tech. Letter No. 1110-2-310, U.S. Army Corps of Engineers, CECW-ED.
  36. Vanmarcke, E.H. (1977), "Reliability of earth slopes", J. Geotech. Geoenviron., 103(11), 1247-1265.
  37. Wright, P. (2010), "Assessment of London underground tube tunnels - investigation, monitoring and analysis", Smart Struct. Syst., 6(3), 239-262. https://doi.org/10.12989/sss.2010.6.3.239
  38. Xu, B. and Low, B.K. (2006), "Probabilistic stability analyses of embankments based on finite-element method", J. Geotech. Geoenviron., 132(11), 1444-1454. https://doi.org/10.1061/(ASCE)1090-0241(2006)132:11(1444)
  39. Zhan, L.T., Ng, C.W.W. and Fredlund, D.G. (2006), "Instrumentation of an unsaturated expansive soil slope", Geotech. Test. J., 30(2), 1-11.
  40. Zhang, L.L., Zhang, L.M. and Tang, W.H. (2005), "Rainfall-induced slope failure considering variability of soil properties", Geotechnique, 55(2), 183-188. https://doi.org/10.1680/geot.2005.55.2.183

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