Abstract
AbstractThe seismic stability of any vulnerable landslide slope is of great importance, especially for those slopes stretching along the national highways connecting important places in the Himalayas. The present study area is located in the Garhwal Himalayas near Tehri town in Tehri Garhwal district of Uttarakhand. It is situated about 5–7 km south of the surface trace of the Tons thrust (TT) or the North Almora Thrust (NAT). The region falls in Zone IV of the seismic zoning map of India. Hilly regions of Uttarakhand have past record of several major earthquakes, the most well-known ones being the Uttarkashi earthquake (1991) of magnitude 6.6 and the Chamoli earthquake (1999) of magnitude 6.3. For the present study, a debris slope has been selected which is located along the highway connecting Tehri and Koteshwar townships. The connecting road is also of importance because it connects the Tehri Dam (the tallest dam in India) built on the Bhagirathi River and Koteshwar Dam built in the downstream of the Tehri Dam. The area is also prone to high seismic activities due to the reasons mentioned before. Overall, a careful and detailed stability analysis of the potential slopes is required for this region. To perform a generalized seismic stability analysis, the study is divided into three parts: Firstly, a stability analysis of the study slope is carried out for static and pseudo-static loading conditions as per the relevant standard guidelines. Then, the critical seismic coefficient has been evaluated for the critical target factor of safety of 1 for only horizontal vibration. In the final part, Newmark displacement of the slope along its most probable failure surface has been determined for two major earthquake signatures experienced by the region in the past. For the stability analysis and Newmark displacement evaluation, the two-dimensional limit equilibrium methods developed by several researchers have been utilized.KeywordsGarhwal HimalayasSeismic stabilityPseudo-static analysisCritical seismic coefficientNewmark displacement
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