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Slope Stability Analysis along National Highway-05 (from Karchham Dam to Akpa), Kinnaur District, Himachal Pradesh, India
Journal
Himalayan Geology
ISSN
09718966
Date Issued
2022-01-01
Author(s)
Parkash, Jai
Thakur, Mahesh
Singh, T. N.
Negi, Virender Singh
Abstract
The present study covers the slope stability analysis of 40 vulnerable landslide zones and road cut slopes along National Highway 05 (NH-05), ~25 km from Karchham Dam to Akpa Bridge, Kinnaur district, Himachal Pradesh, India. Using Continuous Slope Mass Rating the stability of 40 slopes was evaluated, 15 slopes fall into the Class IV category, 11 slopes fall into Class V, 7 slopes fall into Class III and 7 slopes fall into Class II category. The kinematic analysis technique was employed to identify the potential failure modes of the jointed rock slopes. The kinematic analysis demonstrates that wedge failure is the most common and likely failure type amongst the three failures (wedge, planar, and toppling) for all studied slopes. Basic Rock Mass Rating (RMRbasic) and Geological Strength Index (GSI) are used for the rock mass classification. The GSI values for the studied slopes vary from 39 to 57, indicating blocky/disturbed to very blocky rock mass. Observations indicate no correlation between RMRbasic and GSI values for 40 slopes in the study area. Therefore, it is better to employ RMRbasic and GSI separately to understand the jointed rock mass condition of the region.
Volume
43
Subjects