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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 138 for “"overburden"”.
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Determining a Total Dissolved Solids Release Index from Overburden in Appalachian Coal Fields
… treat and isolate potentially acid-forming overburden materials at coal mines in the region. However, the techniques to predict acid mine drainage potential may not adequately predict the release of total dissolved solids (TDS). High concentrations of TDS have been linked to a decrease in …
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Effect of overburden pressure on fluid flow through a monolayer propped fracture, The
Includes bibliographical references.
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Processes Governing Rapid Recharge Events in a Shallow Fractured Rock Aquifer Having Minimal Overburden Cover
… of this work is to investigate the influence of overburden cover on controlling recharge to a bedrock aquifer, specifically focusing on rapid recharge events. Rapid recharge events have been observed in a fractured rock site in eastern Ontario and fractured rock sites around the world. The …
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Characterizing the geochemical reactions in overburden waste pile : Synerude Mine Site, Fort McMurray, Alberta, Canada
… waste piles from sulphide-bearing salinesodic overburden include acid-mine drainage and salinization of surface soils. Acid-mine drainage may result from the production of sulphuric acid during the oxidation of sulphide minerals. Acid production during the oxidation of sulphide minerals may …
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An experimental investigation on Archie parameters at ambient and overburden conditions of clean reservoir rocks.
… an experimental investigation of the effect of overburden pressure, porosity type and experimental conditions on the electrical properties (Archie's parameters) of clean reservoir rocks. The samples were from sandstone formations (North Sea), and carbonate formations (Sirte Basin, Libya). …
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Effect of overburden stress on the formation and stability of arches in unconsolidated sands, The
Includes bibliographical references (pages 49-51).
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Effects of calcium, sulphur and potassium concentration in overburden on quality of strip mine drainage
… emphasis on coal production. Analysis of overburden is becoming mandatory in order to plan effective placement of material in spoil piles. One rapid technique with little sample preparation for determination of elements in overburden is scanning electron microscopy. This method was …
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A mixed integer model for optimizing equipment scheduling and overburden transport in a surface coal mining operation
… mining operation nor the interdependence of overburden removal and spoil placement. The lack of available techniques prompted the development of a mixed integer model to optimize the scheduling of equipment and the distribution of overburden in a typical mountaintop removal operation. Using …
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Mine soil genesis and tall fescue nutrient status as a function of overburden type and cultural amendment
Natural soils in the Appalachian coal mining region occur on steep slopes and are often thin, rocky, acidic, and/or infertile. This often makes use of natural topsoil for surface coal mine reclamation impractical. Sandstone (SS) and siltstone (SiS) topsoil substitute materials in mixed and pure …
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Western North Dakota lignite strip mining processes and resulting subsurface characteristics
… after reclamation. The redistribution of the overburden sediments is less predictable, however.</p> <p>Through field observations, the major mining factors controlling subsurface structure and overburden sediment redistribution were determined. These include the geometry of the coal body, pit …
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Modeling Offset-Dependent Reflectivity for Time-Lapse Monitoring of Water-Flood Production in Thin-Layered Reservoirs
… that the AVO responses are contaminated by the overburden and the thinness of the reservoir. In order to remove transmission loss due to overburden effects, the synthetic AVO curves were scaled by normalizing an overburden-over-half-space model to an idealized analytical Zoeppritz model. In a …
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DEVELOPMENT OF AN APPROACH TO EVALUATE FRACTURED CRYSTALLINE BEDROCK WATER RESOURCE SUPPLY AND SUSTAINABILITY
… the amount of recharge to the bedrock from the overburden during pumping and non-pumping periods; and to develop an approach that can be used in evaluating the sustainability and zone of contribution of bedrock pumping wells. The study entailed installation of bedrock and overburden wells, …
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Cenozoic Cooling Patterns from the Canadian Cordillera using the Uranium-Thorium-Helium Method
… problems such as the amount and extent of overburden removed during the Cenozoic, the possible mechanisms to explain the loss of the thick overburden (i.e. tectonic, climate, erosion), and how our regional cooling history fits into the cooling histories we already have for the Cordillera. …
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The effect of fracture orientation on permeability
… at different orientation angles and tested at an overburden pressure of between 100 and 200 bar using a Nano-Perm machine. Computerised Tomography (CT) was also used to determine the porosity and to characterise the shale samples, with regard to crack width, crack length and to determine if there …
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Discrete element method simulation of wheat bulk density
… the standard bushel test weight because of the overburden pressure and handling practices. The material and equipment properties, and widely varying interactions between kernels add to the complexity of analyzing bulk density changes in stored grain. The influence of these factors on wheat bulk …
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Stability assessment of entry roofs in underlying multiple seam mines
… stress transferred from the upper seam workings. Overburden depth, innerburden thickness, percentage of hard rock in the innerburden and relative location of pillars in the two seams are some of the factors known to influence stress transfer and ensuing instability in the lower seam. This study …
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Near-surface void characterization and sensitivity analysis using enhanced processing procedures on passive Multi-Channel Analysis of Surface Waves (MASW) data
… increases the stress and shear velocity in the overburden load causing high-velocity haloes in the velocity profile. When the roof span becomes too large to support the overburden load, the roof rock will collapse, causing the migration of the void. Upon collapse, the non-collapsed overburden …
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An Engineering Analysis Method for Deep Geothermal Energy
… heat transfer boundary between the aquifer and overburden layers is applied for the axisymmetric problem based on the Lauwerier model for the first time. A new analytical solution is deduced using a series of Laplace transforms. The interaction between the injection well and extraction well is …
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Integrating the LaModel and ARMPS Programs (ARMPS-LAM)
… import data, develop and calibrate the laminated overburden model. The numerical solution module solves the laminated overburden model. The post-processing module can automatically extract and calculate the stability factor and output other important data. The program can also be run in batch mode …
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