Antecedent rainfall induced shallow landslide: A case study of Yunnan landslide, China

Document Type : Research Article

Authors

1 - Dam Safety Management Department, Nanjing Hydraulic Research Institute, Guangzhou Road 225, Nanjing 210029, China. - Dam Safety Management Center of the Ministry of Water Resources, Guangzhou Road 225, Nanjing 210029, China.

2 College of Water Conservancy and Hydropower Engineering, Hohai University, Xikang Road 1, Nanjing 210098, China

3 School of Civil Engineering, Hefei University of Technology, Tun-Xi Road 193, Hefei 230009, China

Abstract

We present a case study of antecedent rainfall-induced failure of engineering slope. The impact of pore-water pressure, the increment of pore-water pressure, and water content, the factor of safety are investigated by numerical models for an actual slope in Yunnan, China. The results indicate that antecedent rainfall played an important role in the stability of the slope. The model reasonably explains the time lag between the occurrence of rainfall and landslides. Pore-water pressures have significantly changed at the upper layer of red clay slope, the cracks phenomenon at the upper of the slope agrees with the field observations before landslide. The saturated zone of the slope gradually expands from the top to bottom of the slope, the major reason for landslide is that the surface stagnant water after rainfall gradually infiltrates into the weathered gneiss rock, resulting in the decrease of the strength of weathered gneiss rock, and then the weight of later rainfall caused the landslide of the slope. The factor of safety of the slope was evaluated by the modified limit equilibrium methods, it was shown that the actual failure occurred when the calculated factor of safety approaches its minimum 0.97. The landslide is characterized by shallow landslides.

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References

Refrences:
1.Basile, A., Mele, G., and Terribile, F. Soil hydraulic behavior of a selected benchmark soil involved in the landslide of Sarno 1998", Geoderma., 117(34), pp. 331- 336 (2003).
2. Ost, L., Van, J., Poesen, J., et al. Characteristics and spatial distribution of large landslides in the Flemish Ardennes (Belgium)", Zeitschrift gur Geomorphologie, 47(3), pp. 329-350 (2003).
3. Li, Y.J., Hicks, M.A., and Nuttall, J.D. Comparative analyses of slope reliability in 3D", Engineering Geology, 196, pp. 12-23 (2015).
4. Brand, E. Landslide in southeast Asia: A state of the art report", 4th Int. Conf. on Landslides., Toronto, Canada (1984).
5. Lim, T.T., Rahardjo, H., Chang. M.F., and Fredlund D.G. E_ect of rainfall on matric suctions in a residual soil slope", Can. Geotech. J., 33, pp. 618-628 (1996).
6. Rahardjo, H., Li, X.W., and Toll, D.,G. The e_ect of antecedent rainfall on slope stability", Geotechnical and Geological Engineering, 19, pp. 371-399 (2001).
7. Lumb, P. Slope failures in Hong Kong", Quarterly Journal of Engineering Geology, 8, pp. 31-65 (1975).
8. Au, S.W.C. Rain-induced slope instability in Hong Kong", Engineering Geology, 51(1), pp. 1-36 (1998). Z. Li et al./Scientia Iranica, Transactions A: Civil Engineering 26 (2019) 202{212 211
9. Brand, E.W., Premchitt, J., and Phillipson, H.B. Relationship between rainfall and landslides in Hong Kong", 4th Int. Conf. on Landslides, Toronto, Canada, pp. 377-384 (1984).
10. Tan, S.B., Tan, S.L., Lim, T.L., and Yang, K.S. Landslide problems and their control in Singapore", 9th Southeast Asian Geotechnical Conference, Bankok, Thailand (1987).
11. Wei, J., Heng, Y.S., Chow, W.C., and Chong, M.K. Landslide at Bukit Batok sports complex", 9th Asian Conference on Soil Mechanics and Foundation Engineering, Bankok, Thailand (1991).
12. Rahardio, H. and Leong, E.C. Response of a residual soil slope to rainfall", Canadian Geotechnical Journal, 42(2), pp. 340-351 (2005).
13. Lu, N. and Godt, J.W. In_nite slope stability under unsaturated seepage conditions", Water Resour Research, 44, pp. 104-114 (2008).
14. Lu, N. and Godt, J.W., Hillslope Hydrology and Stability, Cambridge, U.K (2013).
15. Lu, N. and Kaya, M. A drying cake method for measuring suction stress characteristic curve, soilwater retention and hydraulic conductivity function", Geotech. Test. J., 36, pp. 1-9 (2013).
16. Campbell, R.H. and Slips, S. Debris ows and rainstorms in the Santa Monica mountains and vicinity, Southern California", Geological Survey Professional Paper, p. 51 (2013).
17. Montgomery, D.R. and Dietrich, W.E. A physically based model for the topographic control on shallow landsliding", Water Resource Research, 30(4), pp. 1153-1171 (1994).
18. Montrasio, L. and Valetino, R. A model for triggering mechanisms of shallow lanslides", Natural Hazards Earth System Science, 8, pp. 1149-1159 (2008).
19. Bordoni, M., Meisina, C., Valentin, R., Lu., N., et al. Hydrological factors affecting rainfall-induced shallow landslides: From the _eld monitoring to a simplified slope stability analysis", Engineering Geology, 193, pp. 19-37 (2015).
20. Vanapalli, S.K., Fredlund, D.G., Pufahl, D.E., et al. Model for the prediction of shear strength with respect to soil suction", Can. Geotech. J., 33, pp. 379- 392 (1996).
21. Godt, J.W., Baum, R.L., Savage, W.Z., et al. Transient deterministic shallow landslide modelling: requirements for susceptibility and hazard assessment in a GIS framework", Engineering Geology, 102, pp. 214- 226 (2008a).
22. Godt, J.W., Schulz, W.H., and Baum, R.L. Modelling rainfall conditions for shallow landsliding in Seattle, Washington. Landsliding and Engineering Geology of the Seattle Washington Area, In: Baum, R.L, Dodt, J.W., and High, L.M. (Eds.), Engineering Geology, 20, pp. 137-152 (2008b).
23. Godt, J.W., Baum, R.L., and Lu, N. Landsliding in partially saturated materials", Geophys. Res. Lett., 36, pp. 23-29 (2009). 24. Ng, C.W.W. and Shi, Q. A numerical investigation of the stability of unsaturated soil slopes subjected to transient seepage", Computers and Geotechnics, 22(1), pp. 1-28 (1998).
25. Tsaparas, I., Rahardjo, H., Toll, D.G., and Leong, E.C. Controlling parameters for rainfall induced landslides", Computers and Geotechnics, 29, pp. 1-27 (2002).
26. Bishop, A.W. The use of pore-pressure coefficients in practice", Geotechnique, 20(2), pp. 148-152 (1954).
27. Morgenstern, N.R. and Price, V.E. The analysis of the stability of general slip surface", Geotechnique, 15(4), pp. 289-290 (1965).
28. Spencer, E. A method of analysis of embankments assuming parallel interslice forces", Geotechnique, 17(1), pp. 11-26 (1967).
29. Ducan, J.M. State of the art: Limit equilibrium and _nite element analysis of slopes", J. Geotech. Geoenviron, 122(7), pp. 577-596 (1996).
30. Borja, R.I. and White. J.A. Continuum deformation and stability analyses of a steep hillslide slope under rainfall in_ltration", Acta Geotech., 5, pp. 1-4 (2010).
31. Buscarnera, G. and Whittle. A. Constitutive modelling approach for evaluating the triggering of ow slides", Can. Geotech. J., 49(5), pp. 499-511 (2012).
32. Sebong, O. and Ning, L. Slope stability analysis under unsaturated conditions: Case studies of rainfallinduced failure of cut slopes", Engineering Geology, 184, pp. 96-103 (2015).
33. Fredlund, D.G., Morgensterm, N.R., and Widger, R.A. The shear strength of unsaturated soil", Canadian Geotechnical Journal, 15(3), pp. 313-321 (1978).
Scientia Iranica
Volume 26, Issue 1
Transactions on Civil Engineering (A)
January and February 2019
Pages 202-212

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History

  • Receive Date: 17 January 2017
  • Revise Date: 10 May 2017
  • Accept Date: 12 June 2017

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