Session Start Date

6-1-1988

Abstract

The main dam at the Bighorn development consists of a zoned earthfill embankment with a concrete cut-off wall constructed through the river alluvium by the slurry trench technique. Upon first filling of the reservoir in 1972, erratic drops in piezometric heads in the alluvium upstream of the cut-off and significant downstream leakage prompted the construction of a weight berm at the downstream toe and implementation of a program of regular monitoring of all piezometers and seepage measuring facilities. Concern for the integrity of the structure was not allayed until completion of a dam safety evaluation in 1984. The paper summarizes the design and construction aspects of the main dam and concrete cut-off, documents the results of monitoring records of seepage and piezometric heads since reservoir filling and assesses the extent of reservoir siltation. Records and inspections demonstrate satisfactory performance of the structure.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1988

Document Version

Final Version

Rights

© 1988 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Performance of an Earthdam and Cut-off Through Deep Alluvium

The main dam at the Bighorn development consists of a zoned earthfill embankment with a concrete cut-off wall constructed through the river alluvium by the slurry trench technique. Upon first filling of the reservoir in 1972, erratic drops in piezometric heads in the alluvium upstream of the cut-off and significant downstream leakage prompted the construction of a weight berm at the downstream toe and implementation of a program of regular monitoring of all piezometers and seepage measuring facilities. Concern for the integrity of the structure was not allayed until completion of a dam safety evaluation in 1984. The paper summarizes the design and construction aspects of the main dam and concrete cut-off, documents the results of monitoring records of seepage and piezometric heads since reservoir filling and assesses the extent of reservoir siltation. Records and inspections demonstrate satisfactory performance of the structure.