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Geomechanics and Engineering
  Volume 2, Number 2, June 2010 , pages 125-140

Stability analysis of a rock slope in Himalayas
Gali Madhavi Latha and Arunakumari Garaga

    Slope stability analysis of the right abutment of a railway bridge proposed at about 350 m above the ground level, crossing a river and connecting two huge hillocks in the Himalayas, India is presented in this paper. The site is located in a highly active seismic zone. The rock slopes are intensely jointed and the joint spacing and orientation are varying at different locations. Static slope stability of the rock slope is studied using equivalent continuum approach through the most commonly used commercial numerical tools like FLAC and SLOPE/W of GEOSTUDIO. The factor of safety for the slope under static conditions was 1.88 and it was reduced by 46% with the application of earthquake loads in pseudostatic analysis. The results obtained from the slope stability analyses confirmed the global stability of the slope. However, it is very likely that there could be possibility of wedge failures at some of the pier locations. This paper also presents the results from kinematics of right abutment slope for the wedge failure analysis based on stereographic projections. Based on the kinematics, it is recommended to flatten the slope from 50o to 43o to avoid wedge failures at all pier locations.
Key Words
    jointed rock mass; static slope stability; pseudo-static analysis; kinematic analysis and wedge failure.
Gali Madhavi Latha and Arunakumari Garaga: Dept. of Civil Engineering, Indian Institute of Science, Bangalore, India

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