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Öğe ASSESSMENT OF PILLAR DIMENSIONS OF CANKIRI-TURKEY ROCK SALT MINE BY NUMERICAL ANALYSES(INT SCIENTIFIC CONFERENCE SGEM, 2011) Ozsen, Hakan; Ozkan, Ihsan; Sensogut, CemCankiri rock salt formation is one of the most important rock salt sources of Turkey. Rock salt production in this area is performed by underground room and pillar mining method approximately 150 m under existing topography. However, pillar dimensions which are used in Cankiri rock salt mine are determined by trial and error method. Aim of this study is to create a model which will overlap long and short term rock mechanics analysis results with in-situ stresses and in-situ deformations. By the evaluation of these results pillar dimensions were determined by numerical methods. Numerical analyses were carried out with PHASE(2) software which uses a hybrid numerical modeling method. Firstly the pillar dimensions applied at the present time were investigated then different pillar dimensions were tested in order to investigate the boundary conditions of safe pillar dimensions.Öğe DETERMINATION OF THE UNIAXIAL COMPRESSIVE STRENGTH OF COAL WITH INDIRECT TESTS(INT SCIENTIFIC CONFERENCE SGEM, 2008) Bilim, Niyazi; Ozkan, IhsanThe uniaxial compressive strength (UCS) is one of the important input parameters used in rock engineering designs of underground spaces, or rock blasting, drilling, slope stability, excavation rate and many other civil and mining operations. Although, the method is relatively simple, it is time consuming and expensive; also, it requires well prepared rock cores. Therefore, indirect tests are often used to predict the UCS, such as Schmidt hammer, point load index and sound velocity. Besides, these indirect tests can usually preferred for coal, because preparing core sample from coal is so difficult. The main objective of this study is to evaluate these simple methods of estimating the UCS of coal. The result of uniaxial compression test carried out on 46 different coal samples were compared with the corresponding results of the point load, the natural density, the Schmidt hammer and the sound velocity tests. The data were analyzed to determine the correlation of results for each test.Öğe Development of computer software based on RMR, Q and M-RMR classification systems used for rock mass characterization: ROCKMASS V2.0(CRC PRESS-TAYLOR & FRANCIS GROUP, 2015) Inik, Ozkan; Ozkan, Ihsan; Unal, ErdalRock mass classification systems provide more insight into rock mass conditions. Therefore, rock mass classification systems, mainly used in engineering applications is an empirical design method. RMR, Q, and M-RMR classification systems take into account 28 geotechnical parameters. To characterize rock mass behavior for each of geotechnical intervals, 28 geotechnical parameter must be described. The number of data gathered for all boreholes increases exponentially. As a result, evaluation of these data and also reporting is quite difficult and time-consuming procedure. In order to overcome these difficulties, ROCKMASS v2.0 has been developed, which is only based on RMR, Q and M-RMR classification systems. The geotechnical parameters obtained from each of geotechnical interval can be easily recorded by ROCMASS v2.0. After recording all the data for borehole, the needed log reports and evaluations for investigated borehole are given by ROCKMASS v2.0.Öğe GEOGRAPHIC INFORMATION SYSTEM FOR KONYA CLOSED BASIN PROJECT(BULGARIAN CARTOGRAPHIC ASSOC, 2012) Ustun, Aydin; Bildirici, I. Oztug; Ustuntas, Taner; Tusat, Ekrem; Ozkan, Ihsan; Eren, Yasar; Ozdemir, AdnanThe main goal of the Konya Closed Basin Project is to investigate land subsidence within the basin. The vertical changes have been investigated through GPS measurements and InSAR images taken at different dates. In order to decide whether the land subsidence is significant for land use in residential and agricultural areas within the basin, a GIS system is necessary. For this purpose GoogleEarth, MapInfo and Generic Mapping Tools (GMT) were chosen as GIS software packages. At first, a preliminary study has been performed using I: 100 000 and 1: 250 000 topographic maps which are scanned and registered. A continuous mosaic of map sheets created from them is overlaid on the terrain in the Google Earth. GPS deformation network was designed over the mosaic map considering land use and hydrogeological properties of the KCB. Other data that the system contains are GPS points, wells, at which water depth is measured, InSAR images, geologic layers created from geological maps, and land use maps created by using NVDI method. The geology maps are digitized in MapInfo. After the completion of data collection, GIS analyses will be undertaken in order to evaluate land subsidence potential of the basin.Öğe Land subsidence in Konya Closed Basin and its spatio-temporal detection by GPS and DInSAR(SPRINGER, 2015) Ustun, Aydin; Tusat, Ekrem; Yalvac, Sefa; Ozkan, Ihsan; Eren, Yasar; Ozdemir, Adnan; Bildirici, I. OztugKonya Closed Basin that includes two depression blocks, Konya and Tuz Golu, is the biggest endorheic basin in Turkey. A lowering in the ground levels of the depositional areas has been shown with respect to the surrounding mountains. In the past, this process was controlled by geological and hydrogeological phenomena; nowadays, it has gained a new dimension due to the excessive pumping of groundwater to the Earth's surface. The geodetic techniques such as Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) reveal a considerable land subsidence resulting in the rate of 1-4 cm/year in Konya sub-basin. It seems that the calculated amounts are responsible for changing environmental conditions like seasonality. Both GPS and differential InSAR techniques verify these relatively small fluctuations in the subsidence development. Target districts that should be observed primarily are agricultural zones where groundwater is overused for irrigation and regions where human population density is high. The geocoded interferogram and vegetation index map verify the spatial relation between the subsidence and green areas. In this study, a project dealing with the investigation of the land subsidence occurrences and of their possible causes and consequences within a specific part of Konya Closed Basin is introduced.Öğe Measurement and mathematical modelling of the creep behaviour of Tuzkoy rock salt(PERGAMON-ELSEVIER SCIENCE LTD, 2014) Ozsen, Hakan; Ozkan, Ihsan; Sensogut, Cem[Abstract not Available]Öğe A new approach for applying the in-situ Schmidt hammer test on a coal face(PERGAMON-ELSEVIER SCIENCE LTD, 2008) Ozkan, Ihsan; Bilim, NiyaziThe indirect Schmidt hammer test is used to determine the mechanical behavior of rock materials. The method has so far been widely applied to intact rock, and therefore researchers have developed procedures for its use on rock cores and blocks. However, there is currently little information about using the Schmidt hammer for in-situ testing. The purpose of this study was therefore to evaluate the application of the Schmidt hammer test in-situ on a coal face. In this study, a measurement area of 72 m(2) was selected in the center of a 330 m(2) longwall face. The main measurement area was divided into a grid system, with each grid section having an area of 0.375 m(2). The tests were conducted as a single hammer impact at the center of each grid section. One thousand nine hundred and sixty-five records were constructed using the data obtained from 10 face positions, and these were used for statistical analyses. The statistical results suggested that the total number of tests carried out on the main measurement area was more than the minimum required. An equation was then developed that not only gives the appropriate test number, but also provides information about the grid system. Hence, a new approach is proposed for determining the optimum grid system and test number for in-situ testing of coal faces. (C) 2007 Elsevier Ltd. All rights reserved.
