Managing Geological Complexity in Tail Race Tunnels and the Outfall Structures of Tehri Pumped Storage Project-A Case Study

This paper by Dr. R.K. Khali, Vice President of the Tunnelling Association of India (TAI) and Senior Vice President Operations (Tunnelling & Hydro) at GR Infra, discusses advance identification of geological risks, design updating, and measures applied to reduce the risks in the construction of Twin Tail Race Tunnels and Outfall Structures of Tehri Pumped Storage Hydro Project in the Indian Himalayas. It also underlines the meticulous construction planning, on the spot resolution of the problem, and visualization of geological risks involved at every stage of design and execution.

Abstract

The Tehri Pumped Storage Plant (PSP) Project is one of the prestigious ongoing mega projects in the state of Uttarakhand in Tehri Garhwal District, India. Prior Estimate of uncertainties and risks involved in the construction process is central to decision making in the underground projects. This Project aims to generate 1000 MW of power by harnessing the Hydro power potential of the mighty Bhagirathi River- the main tributary to the river Ganges.

The main feature of this project is its Tail Race Tunnels and Outfall structures, which will function as Tail Race Tunnels and Outfall in generation mode and as Head Race Tunnels and Power Intake structures in the pumping stage.

The paper presents geological risk assessment and mitigation measures during the construction of the Twin Tail Race Tunnels and outfall structures of the Tehri Pumped Storage Hydro Project, highlighting design optimisation, construction planning, and effective on-site solutions.

🔒 This article is for subscribers only. Log in to read.

Subscribe for a Month @ ₹200/- Subscribe for a Year @ ₹1000/-