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  Optimization of the Orientation of Large Underground Caverns in High Stress Condition

  Underground caverns are used for a variety of purposes. These include caverns for Desilting, Surges, Turbine, Generators & Transformers, etc. in hydroelectric projects, caverns for storage of liquid or gaseous fuels, underground caverns warehouses and underground sports facilities. Because of the high capital costs and the risks associated with public access to these facilities, care has to be taken in the design of the caverns to ensure that potential risks are kept to an absolute minimum while, at the same time, providing cost effective and practical engineering solutions. The present paper is a case study from Indian Himalayan area where orientation of the cavities for underground caverns for a mega hydroelectric project has been proposed from a practical point of view with the goal to minimize stress concentration problems, create a stress field as uniformly distributed as possible in the excavation of underground structures with optimum and effective Support system at preliminary design stage. The aim of paper is to emphasis the influence of Geotechnical parameters to design the orientation of underground cavern in complex Himalayan geological condition.

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