The Effects of Longitudinal Dimension in Three Dimension Slope Stability Analysis

Document Type : Technical Notes

Authors

1 Research Scholar, National institute of technology, Patna

2 Dept. of Civil Engineering, National Institute of Technology, Patna, India

Abstract

Of late, three dimensional slope stability analysis has gained popularity among the geothechnical engineers so that the actual response of slope failure, which essentially occurs in 3D, can be captured. However, three dimensional slope failure analysis necessitates the proper consideration of the third/longitudinal dimension of the slope. Three dimensional slope stability analysis can yield erroneous results if inadequate length of the third dimension of the slope is used during analysis. Bishop's simplified method is used to determine the minimal length of a 3D soil slope's third/longitudinal direction for analysis. A parametric study contrasts 3D and 2D analyses for cohesive-frictional slope geometries, pore pressure ratios, and seismic stress. To explore 3D and 2D factor of safety (FS) convergence for slopes with varying inclination angles and longitudinal length-to-height (l/h) ratios, 15 loading examples were analyzed. This study suggests that a 3D slope model's longitudinal/third dimension should be at least five times the slope's height for proper analysis. A slope's base or toe collapse and failure mass volumes are estimated for all loading circumstances. Toe failure replaces base failure as a slope's base inclination angle increases. As slope angle increases, failure mass decreases.

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Civil Engineering Infrastructures Journal

Articles in Press, Accepted Manuscript
Available Online from 16 December 2023

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History

  • Receive Date: 10 July 2023
  • Revise Date: 07 December 2023
  • Accept Date: 16 December 2023

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