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Slope Stability and Landslides

  • Paudel, S.
  • Yatabe, R.
  • Tiwari, R. C.
  • Bhandary, N. P.

A massive landslide in the Jure village of Sindhupalchowk District, Nepal, occurred on August 2, 2014, wiping out dozens of houses and blocking the Sunkoshi River. The spectral element method (SEM) is employed here to study the stability of the slope where the landslide occurred, considering dry and wet slope conditions and pseudo-static seismic loading (with refer to 7.8Mw 2015 Barpak-Gorkha, Nepal earthquake). The results show that the Jure landslide slope becomes unsafe when the ground water table (GWT) is at the surface and peak ground acceleration (PGA) is greater than 0.2 g considering two slope cross-sections (section 2-2 and 3-3), and greater than 0.1 g for one slope cross-section (section 1-1). Based on the computational results, a correlation is made between the factor of safety (FS) and the PGA for the Jure landslide slope. Mitigation methods such as slope modification and ground water table reduction (drainage) are then proposed to increase the slope FS. The SEM results are then verified with a finite element method (FEM) technique. © 2018 American Society of Civil Engineers.

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