Browsing by Author "Mamurekli D."

Now showing 1 - 7 of 7
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    A user-driven computer model for open pit blast design
    (2002) Mamurekli D.
    In open pit mines and quarries, mining of ore beneath overlying burden is mostly performed by the help of appropriate blasting processes in easing of the excavation of adjacent rock. Reaching to required blast outcomes is expected to affect the succeeding processes, directly. Therefore an easy control and the specific blast programme is necessary, most of the time. In this study, first, many effective factors on blast design were investigated; secondly, the related theoretical and or practical equations up to date which include these factors were studied. A user-driven computer model was developed using Pascal software language to be able to fulfill design considerations of the blast area interacting with the inputdata keyed in. To design with, the developed computer model was put into test running it under several predetermined values of different blast design considerations. Later, it was run several times using mechanical characteristics of rocks sampled from a private limestone quarry and recommendations were suggested on blast design.
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    A computer model for front-end loader and rear-dump truck system
    (2003) Mamurekli D.
    In this study, a computer model has been developed for front-end loader (FEL) and rear-dump truck (RDT) system in advanced basic language using an analytic modelling technique. The model determines the number and hourly capacity of front-end loaders according to their bucket capacities, the matched capacity and the number of hauling units and the fleet size required to meet the given production. In addition, the model also provides the using of FEL as hauling equipment in short distances and for elevated sites. Model requires three types of input parameters namely; factors related to production, material characteristics and specifications of both FEL and RDT. For these parameters, adequate help screens inform of tables are presented. As a consequence, a rough analysis can be conducted by selecting the values from the tables without requirement to any prior testing or measurement.
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    A seismograph data-based computer program for determination of dynamic soil properties
    (2004) Mamurekli D.
    Being obliged to live in one of the most dangerous quake risk carrying and youngest continent-to-continent plate boundary regions in the world brings about importance of geophysical, geological, measurements to be able to assess local strategies to reduce the after effects of earthquakes. The capacity of local geotechnical properties of underlying soft soil on the local amplification during an earthquake is directly related to real time destruction behaviour of shear waves on the surface, which can be computed with data recorded with the seismometer. In this study, a seismograph data-based computer program in Microsoft Excel was developed for the determination of dynamic soil properties in parallel layered media. It estimates P-S wave velocities and depths of the layers by means of finding out the points of refraction at adjacent layers' interfaces. Consequently dynamic properties of the layers are computed using wave velocity related mathematical equations.
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    Determination of onset of failure of rocks in multiple failure state triaxial tests using scale-based differential geometry
    (2009) Bagci U.; Mamurekli D.
    This study presents a new method of estimating onset of failure points in multiple failure state triaxial tests of different rocks. This is done by extracting curvature landmarks and their invariant extensions using a scale-based differential geometry approach on the load-displacement curves. Altogether, the load-displacement data of 165 cored samples of different rocks including Norite, Granite, Limestone, Sandstone, Siltstone, Marble and Halite were used during this study. It has been proved that identifying invariant signatures/features of a load-displacement curve results in locating the onset of failure points with acceptable degree of accuracy.
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    A novel biaxial compression testing system
    (2009) Mamurekli D.; Ergun I.; Singh R.N.
    In this paper, a novel biaxial loading apparatus developed for biaxial compressive and shear strength testing of rock material and rock mass specimens, is described. The suitability of the system is demonstrated by real time compression test results on aluminium and fractured glass plate specimens. The system is capable of applying biaxial compressive stresses uniformly to the side surfaces of the specimens even if the contact surfaces of the platen and the specimen is rough. Stress distribution within the test specimens were measured using strain gauges and photo-elastic transducers. Examine2D plane strain indirect boundary element software was used to classify the magnitude of stress levels of the fringes around symmetrical holes. The biaxial loading system incorporates polyurethane rubber seals, pressurized using two hydraulic pumps. Pressure from the seals is transmitted to the specimens using Teflon lined steel pads. The system can apply uniform biaxial compressive stresses up to 70 MPa, in both directions.
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    Environmental impact of coal utilisation in the UK and measures to mitigate greenhouse effects
    (2009) Singh R.N.; Atkins A.S.; Mamurekli M.; Mamurekli D.
    Coal was the principal source of primary energy in the UK from the era of the industrial revolution to the late 1970s. Competition from indigenously produced oil and natural gas, and cheaper imported steam coal resulted in the decline in coal production in the UK. Consequently, some deep mines became uneconomical for a variety of reasons, such as long underground haul distances, geological difficulties, exhaustion of lease reserves and company's failure to invest capital in new coal producing units. This paper presents the environmental impacts of coal mining, processing and electricity generation together with the application of clean coal technologies to mitigate the greenhouse effects on the environment. The paper concludes that indigenous coal still makes an important contribution to electricity generation by reducing the adverse effects on the balance of payment and provides continuity of supply of energy in the UK.
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    Environmental impacts of coal mining and coal utilization in the UK
    (2010) Mamurekli D.
    Coal has remained the main source of energy in the UK from 1700 to the end of 1970s, and it still plays an important role in the power generation. The paper discusses the current coal consumption in the UK together with environmental impacts of coal mining, coal processing and coal utilisation for power generation. Since coal remains the single biggest contributor to greenhouse gases worldwide, methods for minimising environmental impacts of coal combustion are described in this paper including systematic application of the principles of clean coal technologies financed by the private sector.