A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Engineering geological mapping for the high island water scheme in Hong Kong
Summary The High Island scheme in Hong Kong has involved the construction of two dams 95 m high founded on the sea bed, and 40 km of tunnels. Geological mapping was carried out as part of the site investigation and later during construction. The scheme is in an area underlain mainly by hard igneous rocks, rhyolitic volcanics and granite. The paper describes the basis for mapping in a region where the geological variables of engineering significance are the effects of weathering and fracture systems. Different grade scales were used to describe rock material and rock mass decomposition. Rock material weathering grade was the main basis for the site investigation mapping and rock mass condition for mapping during construction. Examples are given of the maps prepared and the use made of this information. The site investigation mapping was of relevance to final design selection of tunnel alignments, siting of engineering structures, and operation of quarries. Engineering geological maps were included as part of the tender documents. During construction the rock mass zone mapping was a key element in deciding tunnel supports and dam cut-off treatment. These maps provide part of the construction record necessary for future monitoring of the structures.
Engineering geological mapping for the high island water scheme in Hong Kong
Summary The High Island scheme in Hong Kong has involved the construction of two dams 95 m high founded on the sea bed, and 40 km of tunnels. Geological mapping was carried out as part of the site investigation and later during construction. The scheme is in an area underlain mainly by hard igneous rocks, rhyolitic volcanics and granite. The paper describes the basis for mapping in a region where the geological variables of engineering significance are the effects of weathering and fracture systems. Different grade scales were used to describe rock material and rock mass decomposition. Rock material weathering grade was the main basis for the site investigation mapping and rock mass condition for mapping during construction. Examples are given of the maps prepared and the use made of this information. The site investigation mapping was of relevance to final design selection of tunnel alignments, siting of engineering structures, and operation of quarries. Engineering geological maps were included as part of the tender documents. During construction the rock mass zone mapping was a key element in deciding tunnel supports and dam cut-off treatment. These maps provide part of the construction record necessary for future monitoring of the structures.
Engineering geological mapping for the high island water scheme in Hong Kong
1979
Article (Journal)
English
Engineering geological mapping for the high island water scheme in Hong Kong
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