Himachal Pradesh Power Corporation Limited, Sundernagar, H.P.
Online published on 12 January, 2016.
For all medium and large size hydroelectric projects located in the Himalayan region, the underground Power House complex is an imminent choice & mandatory requirement for explicit reasons. However, cost effectiveness & feasibility of an underground cavern for Power House scheme is mainly governed by its stability from different prospective of functional requirement & stability & safety aspects in spacing of the caverns i.e. Power House and Transformer Caverns in an underground Power House Complex.
The paper presents the case study of sizing and spacing of underground caverns of a underground Power House complex located in lightly rugged topography comprising of rocks of bended gneisses with mica schist bends belonging to Jutog group in seismic tectonic block of western Himalayan being in action seismic region of zone-IV. The Power House complex is proposed to have a vertical Francis type machine each of 150 MW capacity to generate 450 MW rated power output under a medium head of about 126 m and design discharge of 393.48 cumecs. Sizing of caverns and spacing are optimized as per geological data & functional requirement from E&M considerations of Shongtong Karcham HEP.
