Abstract
Seismic slope stability hazards assessments based on two-dimensional (2D) analyses limits the interpretation to in-plane motion. This means that the effects on ground motions due to lateral heterogeneity contributed by internal wave reflection are neglected. In this study we assess to which extent a 2D model of a simple topographic crest (spur) is valid, using equivalent 3D simulations. The study shows that seismic analysis based on the analysis of 2D cross sections of slopes with irregular topography such as spur crest lines can misrepresent the response of the slope at the surface. Regular slope geometries representing a laterally infinite slope can be well represented by 2D analyses, however as the slope becomes laterally irregular, the topographic contribution needs to be given careful consideration by way of 3D simulations.
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Acknowledgements
We thank reviewers for their constructive comments and help in preparing this manuscript. This study was funded by Strategic Development Fund (SDF) project no. 43040515-02 at the Institute of Geological and Nuclear Sciences Limited (GNS Science).
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Pasqua, F.D., Benites, R., Massey, C., MacSaveney, M. (2017). Numerical Evaluation of 2D Versus 3D Simulations for Seismic Slope Stability. In: Mikos, M., Tiwari, B., Yin, Y., Sassa, K. (eds) Advancing Culture of Living with Landslides. WLF 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-53498-5_64
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DOI: https://doi.org/10.1007/978-3-319-53498-5_64
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