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  Design and Planning of Large Diameter Underground Surge Shafts

  Two nos. of 20.92m diameter circular upstream surge shafts are designed to facilitate upstream surges of Tehri pumped storage project. The project site is located on the bank of River Bhagirathi in the state of Uttarakhand of India. The Project comprising 04 nos. reversible pump turbine units of 250MW each, involves construction of underground caverns and chambers along with the tunnels of left bank of the River. The Ground is composed of the Lesser Himalayan Phyletic rocks of Chandpur formation. The Shafts are generally 140m deep with a chamber at the top and bottom portion of shaft connected with the Head Race Tunnel. This paper presents the design and planning of support system and the construction sequence for different ground condition and the monitoring performance of shafts during construction. Due to a large shaft diameter, the shafts are planned to be excavated in parts with the pilot opening. Both the shafts are under construction and the paper will discuss the support system design, construction method, sequences of excavation and construction challenges in the complex Geological condition.

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