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  Stability Assessment of the underground powerhouse cavern for the Sach Khas hydroelectric project in Himachal, India

  Stability assessment of an underground powerhouse cavern is a challenging issue, especially in the Himalayan region where rock mass is heavily influenced with active tectonic movement. This article is concerned with the stability assessment of a large underground opening inside the valley toe, where the rock cover varies between 45m (minimum) and 48m (maximum). The planned powerhouse cavern has a dimension consisting 130m length, 23m width and 48 m height. The paper evaluates on the extent of pre-construction phase engineering geological investigations, location and orientation of the powerhouse cavern. Stability analysis is made using numerical modelling and assessment and comparison on the displacement on cavern walls and extent of yielded zone at the periphery of cavern contour are carried out. Uncertainties involved in numerical analysis and boundary conditions for 2D and 3D models under gravitational field stress are also highlighted.

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