Session Start Date

6-1-1988

Abstract

The prominent component of the Inginimitiya Reservoir Project is the Inginirnitiya Darn, This dam with a maximum height of 58 ft. is essentially a homogeneous earthfill embankment except for the slope protection, filter and drainage arrangement. The cut-off for the foundation seepage and the provisions made in the design for seepage control are described in this paper. The reservoir when partially impounded for the first time in 1983 "boiling" (bubbling with fines heaving up) was observed on the downstream at different locations close to the toe of the embankment between chainages 71 and 75. This reach when investigated revealed the presence of an impermeable residual soil layer on the ground surface. The material in the entire foundation of the dam upto bed rock is insitu weathered rock material which is heterogeneous in nature. The analysis of the problem and the remedial measures adopted are discussed in detail. The performance of the embankment dam in 1984 and 1985 after the remedial measures were adopted is found to be satisfactory.

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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Jun 1st, 12:00 AM

Behaviour of Inginimitiya Embankment Dam

The prominent component of the Inginimitiya Reservoir Project is the Inginirnitiya Darn, This dam with a maximum height of 58 ft. is essentially a homogeneous earthfill embankment except for the slope protection, filter and drainage arrangement. The cut-off for the foundation seepage and the provisions made in the design for seepage control are described in this paper. The reservoir when partially impounded for the first time in 1983 "boiling" (bubbling with fines heaving up) was observed on the downstream at different locations close to the toe of the embankment between chainages 71 and 75. This reach when investigated revealed the presence of an impermeable residual soil layer on the ground surface. The material in the entire foundation of the dam upto bed rock is insitu weathered rock material which is heterogeneous in nature. The analysis of the problem and the remedial measures adopted are discussed in detail. The performance of the embankment dam in 1984 and 1985 after the remedial measures were adopted is found to be satisfactory.