Kumar, Prabhat and Jhanwar, J.C. and Kiran, S. and Jha, B.K and Bandopadhyay, C. (2004) Monitoring the stability of two parallel caverns for hydroelectric project - a case study. Journal of Rock Mechanics and Tunnelling Technology , 10 (1). pp. 17-30. ISSN 0971-9059

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The Ghatghar hydroelectric project (GHEP) is under construction in the State of Maharashtra in India for the generation of 250 MW of electricity. The rock mass is composed of the typical basaltic trap formation viz. the compact basalts and the amygdaloidal basalts. The underground power house scheme consists of two major caverns, a machine hall and a transformer hall and intersections. The stability assessment of both the caverns and the intersection has been made through instrumentation. An extensive instrumentation scheme was implemented in these structures to have detailed knowledge on rock mass behaviour during and after the construction and to ascertain the efficacy of the support system. The instrumentation consisted of tape extensometers for measuring convergence, multi-point and single-point borehole extensometers for displacements, load cells for rock load and strain meters for rock strain. These instruments were installed during the process of cavern excavation. The observation so far have revealed that the caverns and other structures are stable. The support system in the caverns consists of 6m long fully grouted rock bolts at a spacing of 2m centre to centre and 50mm thick steel fiber reinforced shotcrete (SFRS). This paper describes the instrumentation scheme and analysis of the monitoring data to evaluate the stability of the caverns.

Item Type: Article
Uncontrolled Keywords: Cavern, monitoring, tape extensometer, borehole extensometer, rock bolt load cell, deformation
Subjects: Blasting
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 16 Feb 2012 13:20
Last Modified: 16 Feb 2012 13:20
URI: http://cimfr.csircentral.net/id/eprint/953

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