Date

08 May 1984, 10:15 am - 5:00 pm

Abstract

Two earth and boulder fill dams of height 127.6 m and 72.2 m are major structures of Ramganga River Project. Their foundation rocks are alternations of clayshale and sandrock of Middle Siwaliks. Both have thick core consisting of central zone of crushed clayshale encased by crushed sandrock zones. The clayshale and sandrock available from spillway excavations, just adjacent to these dams, were utilized as dam fill. No major problem except that of seepage control in cut off trench excavation and compaction near abutments, was encountered during construction. Both the dams are well instrumented. Their construction was completed in 1974-75 and the reservoir has nine fillings since then. Observations reveal that phreatic line has not yet been fully established. The stressmeters installed in clay zone of the core of main dam show effective stresses less than half of the overburden effective stresses, thereby indicating arching due to interaction between clay and sand zones of core.

Department(s)

Civil, Architectural and Environmental Engineering

Meeting Name

1st Conference of the International Conference on Case Histories in Geotechnical Engineering

Publisher

University of Missouri--Rolla

Document Version

Final Version

Rights

© 1984 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 6th, 12:00 AM

Behaviour of Ramganga Dams

Two earth and boulder fill dams of height 127.6 m and 72.2 m are major structures of Ramganga River Project. Their foundation rocks are alternations of clayshale and sandrock of Middle Siwaliks. Both have thick core consisting of central zone of crushed clayshale encased by crushed sandrock zones. The clayshale and sandrock available from spillway excavations, just adjacent to these dams, were utilized as dam fill. No major problem except that of seepage control in cut off trench excavation and compaction near abutments, was encountered during construction. Both the dams are well instrumented. Their construction was completed in 1974-75 and the reservoir has nine fillings since then. Observations reveal that phreatic line has not yet been fully established. The stressmeters installed in clay zone of the core of main dam show effective stresses less than half of the overburden effective stresses, thereby indicating arching due to interaction between clay and sand zones of core.