Location

St. Louis, Missouri

Session Start Date

6-1-1993

Abstract

The Sardar Sarovar (Narmada) Project, Gujarat State envisages the construction of an underground power house (6x200 MW) and its ancillary structures in the Deccan basalt. The basalt lava flows in the area are intruded by dolerite dykes and sills and dissected by fractures, shears and faults. These features have posed varied geotechnical problems like block falls, wedge failures, roof collapses and water seepage during the excavation of machine hall, access tunnel, draft tube tunnels and exit tunnels. The adequacy of support system designed on the basis of Barton’s and Bieniawski’s rock mass classification is constantly monitored and reviewed from time to time. The main power house cavern (210x23x58m) is being entirely supported by rock bolts and shotcretes with wiremesh. In the shotcreted upstream and downstream faces of the power house cavern cracks for maximum height of 22 m has been observed and are under evaluation. The rib supports have been introduced in tunnels passing through slacked zones in dolerite dykes and sills traversed by faults and shear zones.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Third Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1993

Document Version

Final Version

Rights

© 1993 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Geotechnical Problems of the Underground Excavation in the Deccan Basalts Sarovar (Narmada) Project, Gujarat, India

St. Louis, Missouri

The Sardar Sarovar (Narmada) Project, Gujarat State envisages the construction of an underground power house (6x200 MW) and its ancillary structures in the Deccan basalt. The basalt lava flows in the area are intruded by dolerite dykes and sills and dissected by fractures, shears and faults. These features have posed varied geotechnical problems like block falls, wedge failures, roof collapses and water seepage during the excavation of machine hall, access tunnel, draft tube tunnels and exit tunnels. The adequacy of support system designed on the basis of Barton’s and Bieniawski’s rock mass classification is constantly monitored and reviewed from time to time. The main power house cavern (210x23x58m) is being entirely supported by rock bolts and shotcretes with wiremesh. In the shotcreted upstream and downstream faces of the power house cavern cracks for maximum height of 22 m has been observed and are under evaluation. The rib supports have been introduced in tunnels passing through slacked zones in dolerite dykes and sills traversed by faults and shear zones.