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  • Canadian Science Publishing  (2)
  • 1
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    Determining the orientation of fracture planes in a weathered clay till using core samples (1998)
    Canadian Science Publishing
    Details
    Publication Date: 1998-04-01
    Description: A method has been developed to determine fracture plane orientations in clay-rich glacial deposits from core samples obtained from inclined borings. In this method, a portion of each core sample is removed to expose vertical and horizontal surfaces which are used to map each identified fracture plane. An analytical geometry technique is used in conjunction with the mapping data to determine the pole to each fracture plane. These fracture pole data can then be presented on a lower hemisphere equal area projection diagram to indicate preferential fracture plane orientations. The utility of the developed method is demonstrated through a detailed analysis of core samples collected from a 10 m x 10 m site located near Sarnia, Ontario. The data from this investigation indicated the presence of three sets of fracture planes; however, only one of these fracture sets was determined to be statistically significant. The developed method offers an alternative to mapping fracture plane orientations on exposed surfaces of trench excavations.Key words: clay, fractures, orientation, core samples.
    Print ISSN: 0008-3674
    Electronic ISSN: 1208-6010
    Topics: Geosciences
    Published by Canadian Science Publishing
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  • 2
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    Performance evaluation of a tailings pond seepage collection system (2010)
    Canadian Science Publishing
    Details
    Publication Date: 2010-12-01
    Description: Disposal of oil sands tailings in ponds is a common method used by oil sands operators to manage the large volume of tailings generated from oil sands mining. This study considered a large tailings pond with an 11 km long ring dyke that was constructed of permeable tailings sand and equipped with drains and seepage collection ditches designed to collect process-affected water (PAW) from the dyke. The effectiveness of this seepage collection system was examined at the downgradient end of the tailings pond and dyke system using a focussed field investigation supported by groundwater flow modelling. A network of piezometers and drive points were installed in a 1 km2 area to facilitate hydraulic measurements and water sampling to characterize the surface water and groundwater flow system. Chemical tracers suggest migration of PAW in a shallow, permeable sand deposit beyond an inner seepage collection ditch, but elevated hydraulic heads beyond the outer ditch have prevented further migration. A groundwater flow model was used to simulate the observed hydraulic dyke conditions and estimate the amount of PAW discharging into the shallow aquifer in the study area. Under the present hydraulic conditions, the seepage collection system is currently working to effectively contain PAW.
    Print ISSN: 0008-3674
    Electronic ISSN: 1208-6010
    Topics: Geosciences
    Published by Canadian Science Publishing
    Location Call Number Expected Availability
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    PAPER CURRENT
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