Stability Analysis of Two-Dimensional Landslides Subjected to Seismic Loads
In the past, the pseudo-static method used to be the most common for evaluating the stability of landslides under seismic loads, in which static forces acting on the center of gravity of a sliding body are used to consider the effects of earthquake. However, seismic loads of rock and soil differ from time and location to time and location. Obviously, it is irrational for the pseudo-static approach to be applied to solving dynamic problems. In this paper, a displacement-pseudo-dynamic model is proposed to assess seismic stability of landslides, in which the sinusoidal-cosinusoidal wave is applied to simulating earthquake displacement, and an “amplification factor” of peak seismic displacement is referred to as the amplification of seismic wave when it propagates from the bottom to the top of the landslide. The effects of physico-mechanical behaviors of a sliding body on seismic stability of soil slopes are taken into account as well as inertia forces and damping forces. The sensitivity analyses on the permanent displacement and the dynamic factor of safety of landslides are studied in detail. Moreover, a large-scale Tangjiashan landslide that occurred in Wenchuan earthquake is investigated to verify the robustness and precision of the present method. It is found that the results from the present method is in good agreement with those from the previous method.
Key Wordspseudo-dynamic factor of safety slices method inertia force damping force sliding displacement displacement-pseudo-dynamic model two-dimensional landslides seismic loads
Unable to display preview. Download preview PDF.
- 2.David, K.K., Statistical analysis of an earthquake-induced landslide distribution: the 1989 Loma Prieta. Engineering Geology, 2000, 58(3–4): 231–249.Google Scholar
- 5.Terzaghi, K. and Engineer, C., et al., Mechanism of Landslides. Harvard University, Department of Engineering, 1951, 83–123.Google Scholar
- 12.Richard, R. and Elms, D.G., Seismic behavior of gravity retaining walls. Journal of the Geotechnical Engineering Division, 1979, 105(4): 449–464.Google Scholar
- 13.Makdisi, F.I. and Seed, H.B., Simplified procedure for estimating dam and embankment earthquake induced deformations. In: Proceedings of the National Symposium on Soil Erosion and Sediment by Water, Chicago, Illinois, 1977, 125–136.Google Scholar
- 14.Nawari, O., Hartmann, R. and Lackner, R., Stability analysis of rock slopes with the direct sliding blocks method. International Journal of Rock Mechanics and Mining Sciences, 1997, 34(3–4): 220.el–220.e8.Google Scholar
- 20.Deng, Y.H., Research on Solving Methods, Characteristics and Applications of Layered Soil Site’S Natural Frequency. Zhejiang University, 2007. (in Chinese)Google Scholar
- 26.Hu, X.W., Luo, G. and Huang, R.Q., et al. Study of Stability of Remnant Mountain Body in Back Scarp of Tangjiashan Landslide after ‘5.12’ Wenchuan Earthquake. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(11), 2349–2359. (in Chinese)Google Scholar