Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Engineering geology of the ramu 1 hydro-electric project in Papua New Guinea
Summary The Ramu 1 Hydro-electric Scheme is located in the Eastern Highlands of Papua New Guinea. The scheme forms the first stage of a three-stage project to harness the Ramu River as it descends from the Highlands through the Ramu Gorge to the Ramu Valley, a drop of 760 m in 11 km. The Ramu 1 Scheme utilises the upper 225 m of head and has a maximum potential of 75 megawatts. Most of the excavations for the Ramu 1 Hydro-electric Scheme are located in a basal marble layer and overlying interbedded shale — siltstone — greywacke sequence of the Omaura Greywacke (Oligocene). Within the project area these two units form a disharmonic fold in which the marble represents a uniform and flat dipping layer, and the interbedded shale — siltstone — greywacke sequence has been deformed into a southeast-plunging anticline with small secondary chevron folds on the flanks. Both rock types have been intruded by Miocene dolerite of the Akuna Igneous Complex. The different structural styles of the two units are reflected in the form of the dolerite intrusions, which followed the main tension directions in both rock types. In the marble the dolerite occurs predominantly as sills on bedding planes and gently dipping fractures. In the shale — siltstone — greywacke it forms dykes along near-vertical joints oriented either parallel or at right angles to the fold axis. The rock conditions encountered during construction of the scheme are directly related to the structural geology of the area. Excavation problems were caused by the solution and collapse of cave structures in the marble located in particular along bedding planes and dolerite sills; by block and wedge-failures along bedding planes and dolerite dykes in the shale — siltstone — greywacke; and by densely fractured or crushed rock in the vicinity of the contact between the two rock units.
Engineering geology of the ramu 1 hydro-electric project in Papua New Guinea
Summary The Ramu 1 Hydro-electric Scheme is located in the Eastern Highlands of Papua New Guinea. The scheme forms the first stage of a three-stage project to harness the Ramu River as it descends from the Highlands through the Ramu Gorge to the Ramu Valley, a drop of 760 m in 11 km. The Ramu 1 Scheme utilises the upper 225 m of head and has a maximum potential of 75 megawatts. Most of the excavations for the Ramu 1 Hydro-electric Scheme are located in a basal marble layer and overlying interbedded shale — siltstone — greywacke sequence of the Omaura Greywacke (Oligocene). Within the project area these two units form a disharmonic fold in which the marble represents a uniform and flat dipping layer, and the interbedded shale — siltstone — greywacke sequence has been deformed into a southeast-plunging anticline with small secondary chevron folds on the flanks. Both rock types have been intruded by Miocene dolerite of the Akuna Igneous Complex. The different structural styles of the two units are reflected in the form of the dolerite intrusions, which followed the main tension directions in both rock types. In the marble the dolerite occurs predominantly as sills on bedding planes and gently dipping fractures. In the shale — siltstone — greywacke it forms dykes along near-vertical joints oriented either parallel or at right angles to the fold axis. The rock conditions encountered during construction of the scheme are directly related to the structural geology of the area. Excavation problems were caused by the solution and collapse of cave structures in the marble located in particular along bedding planes and dolerite sills; by block and wedge-failures along bedding planes and dolerite dykes in the shale — siltstone — greywacke; and by densely fractured or crushed rock in the vicinity of the contact between the two rock units.
Engineering geology of the ramu 1 hydro-electric project in Papua New Guinea
Furstner, J. M. M. (Autor:in)
1975
Aufsatz (Zeitschrift)
Englisch
Engineering geology in Papua New Guinea: a review
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| British Library Conference Proceedings | 1988
AROUND THE WORLD - Australia-Oceania: CMCC Takes Option on Ramu Ni-Co Project
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