Field Investigation And Finite Element
Modelling Of A Progressive Debris Slide In The
Indian Himalayas
Author(s)
D. P. Kanungo, A. Pain, S. Sarkar, S. Sharma,
S. K. Jain & Z. Ahmad
Abstract
The paper highlights the detailed field and laboratory investigation along with
finite element modelling of a progressive debris slide along a highly vulnerable
road stretch of Chamoli-Badrinath highway (NH-58) in Indian Himalayas. To
investigate the failure process of the landslide, the slope was modelled along two
different profiles using a finite element package PHASE2 based on a 2-
dimensional elasto-plastic model for calculating stresses and displacements. The
material properties for different layers on the slope were chosen from the
laboratory test results of soil samples and available literature. Shear Strength
Reduction (SSR) analysis was performed to determine the critical
Strength Reduction Factor (SRF). It is observed that the critical SRF is 0.54 for
left flank and 0.53 for right flank slope profiles. This indicates that the slope is
highly unstable. The results show very good correlation with the observed field
conditions. The locations of the landslide scars, from where the sliding processes
have already been initiated, match exactly with the FE analysis result. The plane
of sliding is observed to be the boundary between the bedrock and the highly
weathered disintegrated dolomitic soil. A model to predict the progressive failure
mechanism of the western flank of the landslide has also been attempted. After
sliding of the material from the toe portion, the result of the FE analysis showed
the probable location of 2nd phase of detachment and with further sliding the
final phase of detachment was obtained. The FE analysis results have also been
validated with the field signatures.
Keywords: debris slide, finite element modelling, strength reduction factor,
shear strength reduction analysis, progressive failure mechanism.
Keywords
debris slide, finite element modelling, strength reduction factor,
shear strength reduction analysis, progressive failure mechanism.
Related Book
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