Adhikari, G.R. (2002) Excavation of Turbine pits for a Hydroelectric Project - A Case Study. Journal of Rock Mechanics and Tunnelling Technology , 8 (2). pp. 127-139. ISSN 0971-9059

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The paper deals a practical case study of excavation of turbine pits in the powerhouse cavern of the sardar sarovar Project, India. These pits are to be used for installation of six Francis type reversible turbine generators, each of 200 MW. The pits were excavated by drilling and blasting method under adverse geological conditions such as distress problem in the cavern, presence of shear zones, thin rock ledges, etc. For overall stability of the cavern and pit walls, the vibration due to blasting was minimized by excavating the pits in three stages and by reducing the maximum charge per delay to the extent possible. The details of the drilling, charging and initiation patterns used for different stages of the pits are given. The overbreak was controlled by adopting modified line drilling/smooth blasting techniques. The deviation of the actual line of excavation from the designed vertical wall of the pits was measured and the percentage of overbreak in terms of the total volume of the pit was calculated. The treatment provided to the pit walls, pit bottoms and shear zones are also discussed in the paper.

Item Type: Article
Uncontrolled Keywords: Controlled blasting, turbine pits, rock excavation, powerhouse cavern
Subjects: Blasting
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 28 Feb 2012 12:56
Last Modified: 28 Feb 2012 12:58

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