Yazar "Kekec, Bilgehan" seçeneğine göre listele

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    DETERMINATION OF GROUND VIBRATION AROUND LIMESTONE QUARRY IN KONYA, TURKEY
    (INT SCIENTIFIC CONFERENCE SGEM, 2009) Kekec, Bilgehan; Gokay, M. Kemal
    In this study, blast originated vibrations were monitored around the limestone quarry owned by Konya Cement Factory near Konya city. Since the city limits have been widened and the land around the quarry opened to residential area. The work presented here, concentrates the vibration measurements taken from two different locations for each rock blast by Instantel-Minimate plus equipments. The data obtained were then analyzed by means of Blastware 8.0 software and results were presented here in this paper. The vibration measured around the quarry compared by the standards given by Federal Regulations of United States (Office of Surface Mining) and DIN (Germany) standard 4150. Since the blasts were already engineered for low vibration level, it was determined that blast originated vibrations were measured lower than the limitations of the standards.
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    ELECTRICAL RESISTIVITY MEASUREMENT TO ANALYZE THE EFFECTS OF ROCK BLASTING
    (INT SCIENTIFIC CONFERENCE SGEM, 2009) Gokay, M. Kemal; Dogan, Kemal; Kekec, Bilgehan
    Electrical resistivity measurements have been used in engineering for many purposes. In this study, blasting effects on the back of blasted holes at a quarry bench have been put under evaluation. Earth resistivity of bench rock, limestone, was measured before and after blasting by electrical resistivity equipment with the same electrode positions. The resultant resistivity graphs demonstrate the blasting performed in this study influence slightly the rock resistivity of the rock mass situated 4 m from the blasted boreholes. However, after 3 group of blasting, each had 8 or 9 blasted boreholes, repeated near the tested rock, it was determined that due to fissure and micro scale crack separation rock mass resistivity had been changed more remarkably.
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    Evaluation of the effect of vibrational wave propagation of different artificial discontinuous planes in rock samples
    (SPRINGER HEIDELBERG, 2015) Kekec, Bilgehan; Gokay, M. Kemal; Bilim, Niyazi
    Vibrational waves can progress far away from their sources. Therefore, such waves have the capacity to cause damage to human environments. Such waves originating from mining activities (especially rock blasting) should be studied to understand their propagation mechanism in fractured rock masses. To determine how the vibrational shock wave is distributed in fractured rock masses, laboratory tests were performed. Rock samples with different discontinuity geometry combinations were tested by applying exactly the same vibrational shock to the test samples. The cumulative effects of exposure to vibrational shock waves and the propagation of waves at discontinuities in the rock samples were observed from the other end of the sample using vibration seismographs. The measured data indicated which rock mass properties have the most effect on wave propagation. In this study, different discontinuity systems were used in the rock specimens. These discontinuity systems were referred to as the groups 1, 2, 3 and 4 models. Based on the results of the vibration tests, each group was determined to have behaved differently in terms of wave propagation.
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    Evaluation of the usability of Erciyes Mountain (Kayseri, Turkey) volcanic materials as plaster materials providing thermal insulation
    (SPRINGER HEIDELBERG, 2015) Kekec, Bilgehan
    Plaster materials are commonly used on the interiors and exteriors of buildings. Such materials protect against impacts, atmospheric degradation, and physical and mechanical effects. Additionally, plaster materials must provide thermal insulation. In this study, rock samples (three types of ignimbrite) produced by Erciyes Mountain volcanic activity were selected as materials. These selected materials have differences in terms of engineering features. Petrographic properties of the samples were determined employing polarization microscopy. Plaster materials were separately prepared from each sample with the determined engineering features. The plaster materials were separately applied to block surfaces. The blocks were then subjected to heat transmission tests. Additionally, a non-plaster material was tested for comparison. The data obtained in these tests revealed important findings relating to energy savings, and it was found that new materials obtained from wastes of ignimbrites and idle resources formed by Erciyes Mountain (Kayseri, Turkey) volcanic activity can be used as alternative materials.
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    Investigation of the artifical vibration wave motions formed on the dry and saturated rock samples
    (BERG FAC TECHNICAL UNIV KOSICE, 2014) Kekec, Bilgehan; Gokay, Kemal
    Blast-induced vibration waves can expand far away from its resource. According to its strength it has a capacity to damage civil structures. It is therefore critical that wave propagation mechanism of each mine site should be well presented and its neutralization facts are described. In this study, vibration wave result from blasting of mining and tunnel excavation site were simulated in laboratory by impact wave initiator. Vibration propagation based on the change of peak particle velocity in dry and saturated rock samples were then determined to compare. Vibration monitoring seismograph were used to measure and record the waves farm (transverse, longitudinal, vertical and peak vector sum) at the predetermined point on rock samples. Under constant distance between vibration wave initiator and vibration measuring device, differences in waves were evaluated by the rock porosity and water content.
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    MECHANICAL PROPERTIES OF ERCIYES MOUNTAIN VOLCANICS AND THEIR USABILITY AS DIMENSIONAL BUILDING STONE
    (INT SCIENTIFIC CONFERENCE SGEM, 2009) Kekec, Bilgehan; Gokay, M. Kemal
    Some rock types have been more favorable for dimensional building stone since early ages of civilization. These rocks in general are stable and their properties have been long lasting for the selected locations. Due to availability they have been used in human history not only for building stone alone, but they have also been used for other engineering and artistic projects in cities. In this study; mechanical properties of 5 types of ignimbrite rocks and one basalt rock were tested for their usability for dimensional building stone applications. Their colors and mineralogical properties were also verified for their suitability. It was determined that this rock very hard and resistive to weathering effects.
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    A study in cost analysis of aggregate production as depending on drilling and blasting design
    (PERGAMON-ELSEVIER SCIENCE LTD, 2017) Bilim, Niyazi; Celik, Arif; Kekec, Bilgehan
    Since aggregate production has vital importance for many engineering projects such as construction, highway and plant-mixed concrete production this study was undertaken to determine how the costs for such production are affected by the design of drilling and blasting processes used. Aggregates are used in the production of concrete and asphalt, which are critical resources for the construction sector. The ongoing, population increase and the growth of living standards around the world drive the increasing demand for these products. As demand grows, competition has naturally arisen among producers in the industry. Competition in the market has directly affected prices, which leads to the need for new measures and cost analysis on production costs. The cost calculation is one of the most important parameters in mining activities. Aggregate production operations include drilling, blasting, secondary crushing (if necessary), loading, hauling and crushing-screening, and each of these factors affects cost. In this study, drilling and blasting design parameters (such as hole diameter, hole depth, hole distance and burden) were investigated and evaluated for their effect on the total cost of quarrying these products, based on a particular quarry selected for this research. As the result of evaluation, the parameters actually driving costs have been identified, and their effects on the cost have been determined. In addition, some suggestions are presented regarding production design which may lead to avoiding increased production costs. (C) 2017 Elsevier Ltd. All rights reserved.