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Sealing of huge water ingress in headrace tunnel of Uma Oya Project, Sri Lanka
Published in Daniele Peila, Giulia Viggiani, Tarcisio Celestino, Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art, 2020
A. Rahbar Farshbar, A.H. Hosseini
The Highland series rocks cover the whole project area. They include pre-Cambrian rocks formed under high grade metamorphic conditions and are composed of two main types of rocks namely metasediments and charnockites or Charnochitic-gneisses. The metasedimentary rocks are metamorphosed sedimentary rocks and consist of garnet sillimanite gneisses or Khondalites, quartzites, quartz feldspar granulites, garnet gneisses, marble and impure crystalline limestone. Charnochitic gneisses are the most common rock types of the Highland series. Quartzite’s are very hard rocks and difficult to drill through. Marble and impure crystalline limestone may ran into a problem when encountered in tunnels, shafts and dam foundations or across reservoir periphery, especially when associated with faults and karstic zones. The project area is folded into a series of large domes, basins, anticline and syncline structures [Rahbar, A. & Rostami, J. 2016].
Sealing of huge water ingress in headrace tunnel of Uma Oya Project, Sri Lanka
Published in Daniele Peila, Giulia Viggiani, Tarcisio Celestino, Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art, 2019
A. Rahbar Farshbar, A.H. Hosseini
The Highland series rocks cover the whole project area. They include pre-Cambrian rocks formed under high grade metamorphic conditions and are composed of two main types of rocks namely metasediments and charnockites or Charnochitic-gneisses. The metasedimentary rocks are metamorphosed sedimentary rocks and consist of garnet sillimanite gneisses or Khondalites, quartzites, quartz feldspar granulites, garnet gneisses, marble and impure crystalline limestone. Charnochitic gneisses are the most common rock types of the Highland series. Quartzite’s are very hard rocks and difficult to drill through. Marble and impure crystalline limestone may ran into a problem when encountered in tunnels, shafts and dam foundations or across reservoir periphery, especially when associated with faults and karstic zones. The project area is folded into a series of large domes, basins, anticline and syncline structures [Rahbar, A. & Rostami, J. 2016].
Benefits and limitations of using isotope-derived groundwater travel times and major ion chemistry to validate a regional groundwater flow model: example from the Centre-du-Québec region, Canada
Published in Canadian Water Resources Journal / Revue canadienne des ressources hydriques, 2018
Sylvain Gagné, Marie Larocque, Daniele L. Pinti, Marion Saby, Guillaume Meyzonnat, Pauline Méjean
The fractured bedrock formations of Ordovician age are the main aquifer of the area. These can be separated into two major rock type zones: the sedimentary and the metasedimentary (Globensky 1987; Slivitzky & St-Julien 1987). The sedimentary rock zone covers the plain from the St. Lawrence River to the Appalachian Piedmont, and consists of limestone and carbonate-rich shales, shale, and mixed shale and fine sandstone. This area is slightly deformed. A network of southeast-dipping sub-horizontal faults is present. The metasedimentary rock zone mainly covers the Appalachian Mountains and consists of a wide range of schist, quartzite and phyllades. These rocks of the Appalachian Mountains are highly deformed by a network of faults and folds.
Sedimentology in metamorphic rocks, the Willyama Supergroup, Broken Hill, Australia
Published in Australian Journal of Earth Sciences, 2018
B. P. J. Stevens, G. M. Bradley
The GSNSW group formulated an objective classification and nomenclature system for the metamorphic rocks of the Willyama Supergroup (Stevens & Willis, 1983). The aluminous schists and gneisses and their interlayered fine-grained siliceous rocks were recognised as metasedimentary rocks, i.e. metamorphosed sandstones, siltstones and shales rather than just metamorphic mineral assemblages (e.g. ‘sillimanite–biotite–garnet gneiss’). Each layer was recognised as a (metamorphosed) psammite, psammopelite or pelite bed, based on objective criteria, and the mapped units represent various proportions of these beds. The compositions and textures of the very minor layered calc-silicate rocks identified them as metamorphosed carbonate-rich sediments.