Abstract
The Narmada Sagar Dam, a concrete gravity structure under construction across the Narmada River in central India, will have a crest length of 653 m and a maximum height of 92 m. The present paper discusses the results of geotechnical investigations undertaken for evaluating the rock mass strength parameters, applying the modern concepts of rock mechanics, especially the rock mass rating, modulus of deformation, shear parameters, and strength and permeability of the dam foundation rocks. The joint systems observed are used to interpret and explain the occasional zones of poor core recovery and to explain the location and orientation of the drilling programme. It is suggested that the estimate of spacing and opening of water-conducting joints may lead to useful estimates of the groutable volume of voids in the rock mass, and inclined drill holes are preferable for optimum grouting. The values of different parameters have been obtained and correlated. The studies have led to the conclusion that the foundation rocks of Narmada Sagar Dam are competent and suitable for designing the proposed concrete gravity dam. Key words: dam, strength, elastic modulus, deformability, rock discontinuity, rock quality designation, rock mass classification.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.