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Öğe Cuttability Assessment of Selected Rocks Through Different Brittleness Values(SPRINGER WIEN, 2016) Dursun, Arif Emre; Gokay, M. KemalPrediction of cuttability is a critical issue for successful execution of tunnel or mining excavation projects. Rock cuttability is also used to determine specific energy, which is defined as the work done by the cutting force to excavate a unit volume of yield. Specific energy is a meaningful inverse measure of cutting efficiency, since it simply states how much energy must be expended to excavate a unit volume of rock. Brittleness is a fundamental rock property and applied in drilling and rock excavation. Brittleness is one of the most crucial rock features for rock excavation. For this reason, determination of relations between cuttability and brittleness will help rock engineers. This study aims to estimate the specific energy from different brittleness values of rocks by means of simple and multiple regression analyses. In this study, rock cutting, rock property, and brittleness index tests were carried out on 24 different rock samples with different strength values, including marble, travertine, and tuff, collected from sites around Konya Province, Turkey. Four previously used brittleness concepts were evaluated in this study, denoted as B (1) (ratio of compressive to tensile strength), B (2) (ratio of the difference between compressive and tensile strength to the sum of compressive and tensile strength), B (3) (area under the stress-strain line in relation to compressive and tensile strength), and B (9) = S (20), the percentage of fines (< 11.2 mm) formed in an impact test for the Norwegian University of Science and Technology (NTNU) model as well as B (9p) (B (9) as predicted from uniaxial compressive, Brazilian tensile, and point load strengths of rocks using multiple regression analysis). The results suggest that the proposed simple regression-based prediction models including B (3), B (9), and B (9p) outperform the other models including B (1) and B (2) and can be used for more accurate and reliable estimation of specific energy.Öğe DETERMINATION OF GROUND VIBRATION AROUND LIMESTONE QUARRY IN KONYA, TURKEY(INT SCIENTIFIC CONFERENCE SGEM, 2009) Kekec, Bilgehan; Gokay, M. KemalIn 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.Öğe ELECTRICAL RESISTIVITY MEASUREMENT FOR COUNTRY ROCK DISTURBANCE OF SHALLOW RAILWAY TUNNEL(INT SCIENTIFIC CONFERENCE SGEM, 2009) Gokay, M. Kemal; Dogan, KemalThe roof of the tunnel and sidewalls are especially influenced by the tunnels shape and dimension. Rock engineering mostly concentrates the reasons of these disturbances to decide if they are stress induced or discontinuity governing deformations. In this study, it has been concentrated on two shallow tunnels which are 35-90 meters below the ground surface. They were opened in limestone rock mass containing lamination and cavities as well. Electrical resistivity measurements were used to determine the weakness zones around these tunnels. Extension of the weakness zone demonstrated that the disturbance around the tunnels were rock mass controlled instate of stress induced fracturing.Öğe ELECTRICAL RESISTIVITY MEASUREMENT TO ANALYZE THE EFFECTS OF ROCK BLASTING(INT SCIENTIFIC CONFERENCE SGEM, 2009) Gokay, M. Kemal; Dogan, Kemal; Kekec, BilgehanElectrical 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.Öğe ELECTRICAL RESISTIVITY VARIATION IN COAL BEARING STRATA; SLOPE FAILURE ANALYSIS IN COAL MEASURES(INT SCIENTIFIC CONFERENCE SGEM, 2008) Dogan, Kemal; Gokay, M. KemalSlope failure occurring at projected slope operations at open pit mines can lead the workers safety to dangerous positions. In some cases the rock disturbances which may be thought about that, they lead slope failures around the open pit mine operation develop physiological problems among the mine workers. The main aim of this work to determine if the conditions of critical slopes in open pit mines can be monitored through the electrical resistivity methods. The depths of sliding at selected slope were analyzed by using measured earth resistivity values for the defined purposes. Field studies at Ilgin Coal Mine near Konya city presented that electrical earth resisitivity measurements could be used to analyze the slope movements in coal mine.Öğe 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, NiyaziVibrational 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.Öğe INFLUENCE OF COMPULSORY SUMMER PRACTICE ON MINING ENGINEERING STUDENTS(INT SCIENTIFIC CONFERENCE SGEM, 2009) Gokay, Melek; Gokay, M. KemalMining engineering education includes four years of lecturing and three periods of summer practices. The practices must be performed at three different mining sides, including underground mines, open pit mines and ore dressing plants. Students are officially advised during decision time of company selection for their summer practice to get better educational results. In order to understand the mining engineering role by the students, the practice should be performed in mines directed and organized by mining engineers. To analyze the influence of summer practice on the mining engineering students, comprehensive surveys were performed on Selcuk University, Mining Engineering Department. Questions in this survey had been arranged to capture students' gaining from the practices. The problems arose during the practice realization were also questioned for further re-arrangements in departmental future plans.Öğe MECHANICAL PROPERTIES OF ERCIYES MOUNTAIN VOLCANICS AND THEIR USABILITY AS DIMENSIONAL BUILDING STONE(INT SCIENTIFIC CONFERENCE SGEM, 2009) Kekec, Bilgehan; Gokay, M. KemalSome 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.Öğe RESISTIVITY MEASUREMENTS FOR WATER LEAKAGE OF ABANDONED SMALL EMBANKMENT DAM(INT SCIENTIFIC CONFERENCE SGEM, 2009) Dursun, Arif Emre; Gokay, M. KemalIn this study, the water content of the base sediments and rocks under an abandoned small waste water dam in Selcuk University campus in Konya was monitored. This small dam was planned to construct for the beneficiation of the waste water of Selcuk University main campus. After usage of a few mouths, the dam was demolished by campus authorities due to its water leakage through its base sediments. The study presented here contains the work done to determine water localization in the base rocks in front of the dam. The field measurements here were performed by using electrical resistivity measuring equipment. In order to control the water content of the baserock, Wenner-Alfa electrode lining method were used to collect earth resistivity values. Collected data penetrates as deep as 50 meters in ground. This paper presents the resistivity graphs obtained from the field tests. They clearly demonstrated the water passageway in the sediments located. Water traveled through dry river sediments and it was determined that water flows 25 meters underground towards the lowland even in summer times.Öğe STRUCTURAL DISTURBANCE ANALYSES AT SHALLOW DEPTH: SAMPLE CASE STUDY AT THE SURROUNDING OF SU LAW FACULTY BUILDING(INT SCIENTIFIC CONFERENCE SGEM, 2011) Dogan, Kemal; Gokay, M. KemalIt is aimed here to perform electrical resistivity measurements to define ground differentiation especially for 10-20 meters depth. This research purposed to evaluate the groundwater condition around Selcuk University, Law Faculty building groups in Alaaddin Keykubat campus. After the electrical resistivity tests, ground resistivity graphics were drawn for further researches on buildings' structural analyses. The results supplied several cross-sectional 2-D resistivity graphics which were used to understand the groundwater condition below the Law Faculty Buildings. This research was then lead also to evaluate the dry river embankment's water seepage below its sediments originated from Bozdag Mountain at North-West side of the Selcuk University Campus. Electrical resistivity tests performed especially concentrated on the dry river banks located around the Law Faculty Buildings. The results of this research are believed to supply valuable information to understand vertical deformation of the Faculty buildings by demonstrating groundwater flow direction passing under them. At the end of the tests the groundwater flow depth and its lateral distributions were also determined.Öğe STUDENTS' ACCEPTANCE OF MINE ENGINEERING JOB FOR THEIR PROFESSION(INT SCIENTIFIC CONFERENCE SGEM, 2009) Gokay, Melek; Gokay, M. KemalStudents approaches to "mine engineering job" in Selcuk University, Mining Engineering Department is one of the study area to comprehend departmental educational target. This study was taken place by surveying the mining engineering students at Selcuk University. The survey covered first year (grade) students for their ideas and expectations in future. Second and third year students were surveyed for their lectures and difficulties they come across during their education. Fourth year students in the department was tested if they feel ready to start mining engineering job in the mining industry. In this survey study, it was aimed to observe if the students were ready to start their professional life. The outcomes showed that the students had problems in their mind about mining industry and their knowledge. In some limitations, students were found in hesitation to start mining engineering job. They also feel confident about their knowledge and mining engineering future.
