2001 – Cadiangullong RCC Dam: Monitored Performance versus Design Expectations

P.A. Maisano, P.A. Miskell

Design and construction issues relating to Cadiangullong Dam were reported to ANCOLD at
the 1998 Conference on Dams.’ First filling of the dam occurred in July 1998. Monito
ring of installed thermocouples, piezometers, joint and crack meters, movement targets and
seepage measurement devices, has been regularly undertaken by the dam owner and
reviewed by the designer. Annual inspections over these first 3 years of service, with
condition/performance reporting by the designer, has been undertaken in terms of the
license requirements.

Piezometers revealed excessive foundation uplift pressures near the right abutment.
Pressure relief holes drilled into the foundation were subsequently shown to have been successful in lowering foundation uplift pressures. Stability analyses confirmed the dam to
be stable under the new uplift regime.

The paper presents the performance of the structure and the reservoir in meeting the
designer’s and owner’s expectations as an assured process water supply for the Cadia Hill
Gold Mine, one of Australia’ s largest gold mines.

As one of the first roller compacted concrete (RCC) dams to use grout enriched RCC as an
impermeable facing to the upstream face and a durable surfacing to the stepped spillway,
the paper will also provide a performance review of this material which has since been
adopted on a number of other RCC dams worldwide.

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