NHPC Ltd.
Online published on 14 September, 2012.
The understanding of hill slope stability in the construction of hydro project depends upon the realistic approach of Geological investigation & cautious construction procedure. The careful appraisal and analysis of geotechnical data helps to chalk out the strategies for coping with various slope failures.
Excavation of 150m high spillway cut slope of Dhauliganga project experienced various geotechnical problems due to complex geological setup and adverse topographical conditions. With successful application of state of the art technology, the problems were conquered with success. The high angle spillway cut slope necessitated with progressive change in the design of spillway by reducing its width and utilization of diversion tunnel as spillway tunnel. For the first time in Himalayan terrain, a reinforced anchored drift was constructed to stabilize the vulnerable spillway cutslope.
The present paper deals with the several geological problems faced during the excavation of 150m high spillway cut slope of 280 MW Dhauliganga Project, St-I (Uttarakhand) and its remedial measures.
