Managing Geological Complexity in BVC and PAC of Tehri PSP

A. Rakesh Kumar Khali - Vice President-Operations, G R Infraprojects Limited

Butterfly Valve Chamber (BVC), a Penstock Assembly Chamber (PAC)

Tehri hydroelectric project is located on the left bank of River Bhagirathi in the state of Uttarakhand. Tehri Pumped Storage Project (PSP) comprising 4 reversible pump-turbine units of 250 MW each, involves construction of an underground Machine Hall, Upstream Surge Shaft with Chambers - 3 & 4, a Butterfly Valve Chamber (BVC), a Penstock Assembly Chamber (PAC), the Downstream Surge Shaft with Chamber - 3 & 4, a pair of Tail Race Tunnels (TRTs) and the Outlet structures.

Execution of large infrastructure projects cannot be imagined without a high level of engineering explorations, the prerequisites to increasing the economic efficiency of capital investments. Prior estimate of uncertainties and risks involved in the construction process is central to the decision making in underground projects. In such projects, a significant part of the uncertainties results from unknown geological conditions. Timely calculation of risks and actions required are therefore vital for mitigating geological risks in underground construction and tunnelling projects.

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