Construction of Head Race Tunnel for Sewa Hydroelectric Project (Stage-II) LOT SW-1

Rakesh Kumar Khali, Group Project Manager, Hindustan Construction Company

This case study of the Sewa H.E. Project (120MW) in the Kathua district of Jammu and Kashmir, covers the planning process and various construction features of a 10.02km long, 3.3m diameter horseshoe shaped concrete lined tunnel, which had a typical design with 15 kinks throughout. It passed through varying geologies and had seepages at various locations. It was bored by conventional drilling and blasting method by using the full-face method. Rakesh Kumar Khali, Group Project Manager, Hindustan Construction Company, describes the innovative construction methodologies adopted by Gammon and NHPC engineers to execute various tunneling activities concurrently to minimize construction time, along with tackling the challenges posed by the fragile rock conditions, and the various construction equipment used.

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