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Öğe A correlation between P-wave velocity, number of joints and Schmidt hammer rebound number(2001) Kahraman S.[No abstract available]Öğe Authors' reply to the discussion by A. Karakus on the paper "Predicting the sawability of carbonate rocks using multiple curvilinear regression analysis"(Elsevier BV, 2006) Kahraman S.; Fener M.; Gunaydin O.[No abstract available]Öğe Correlation of TBM and drilling machine performances with rock brittleness(2002) Kahraman S.The correlations between three different methods of measuring brittleness and both drillability and borability were statistically investigated using the raw data obtained from the experimental works of different researchers. Strong exponential relationships between the penetration rates of tunnel boring machine (TBM) and the brittleness of B1 (the ratio of compressive strength to tensile strength) and B2 (the ratio of compressive strength minus tensile strength to compressive strength plus tensile strength) were found. There is no correlation between the penetration rates of the diamond drilling tool and the brittleness values. Strong exponential correlations exist between the penetration rates of rotary drills and the brittleness of B1 and B2. However, no correlation between the penetration rate of rotary drills and the brittleness of B3 (the product of percentage of fines in impact strength test and compressive strength) was found. The penetration rate of percussive drills does not exhibit a correlation with the brittleness of B1 and B2, but the penetration rate of percussive drills is strongly correlated with the brittleness of B3. It was concluded that each method of measuring brittleness has its usage in rock excavation depending on practical utility. © 2002 Published by Elsevier Science B.V.Öğe Dominant rock properties affecting the penetration rate of percussive drills(Elsevier BV, 2003) Kahraman S.; Bilgin N.; Feridunoglu C.Percussive blast hole drills were observed in eight rock types at an open pit mine and three motorway sites. The net penetration rates of the drills were calculated from the performance measurements. Rock samples were collected from the drilling locations and the physical and mechanical properties of the rocks were determined both in the field and in the laboratory. The penetration rates were correlated with the rock properties. The uniaxial compressive strength, the Brazilian tensile strength, the point load strength and the Schmidt hammer value exhibit strong correlations with the penetration rate. Impact strength shows a fairly good correlation with penetration rate. Weak correlations between penetration rate and both elastic modulus and natural density were found. Any significant correlation between penetration rate and P-wave velocity was not found. It was concluded that, among the rock properties adopted in this study, the uniaxial compressive strength, the Brazilian tensile strength, the point load strength and the Schmidt hammer value are the dominant rock properties effecting the penetration rate of percussive drills. Theoretical specific energy as defined by different research workers is proved also to be well correlated with penetration rate of percussive drills which verifies basic theoretical works on the subject. In addition, the point load and the Schmidt hammer test can practically be used in the field as a predictive tool for the estimation of penetration rate. © 2003 Elsevier Ltd. All rights reserved.Öğe Estimating the direct P-wave velocity value of intact rock from indirect laboratory measurements(2002) Kahraman S.[No abstract available]Öğe Estimating the rock strength from a crushability index(CRC Press/Balkema, 2016) Kahraman S.; Toraman O.Y.Uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS) are widely used in rock engineering. However, preparing standard samples for the strength tests may not always be possible for weak rocks. On the other hand, only rock fragments are available to estimate the rock strength in some cases such as drilling. Therefore, developing some models for estimating the rock strength from rock fragments will be useful. In this study, a crushability index (CI) was described from crushing test and the possibility of predicting UCS and BTS from this index was investigated. Strong and significant linear correlations were found between the CI and both the UCS and BTS. It is concluded that the UCS and BTS of rock can be estimated from the CI. The suggested method is especially useful for the drilling industry and for the cases where there are not enough samples for the standard tests. © 2016 Taylor & Francis Group, London.Öğe Evaluation of simple methods for assessing the uniaxial compressive strength of rock(2001) Kahraman S.Published data on 48 different rocks are used to evaluate the correlations between the uniaxial compressive strength (UCS) values and the corresponding results of point load. Schmidt hammer, sound velocity and impact strength tests. The variability of test results for each test and each rock type was evaluated by calculating the coefficient of variation. Using the method of least squares regression, the UCS values were correlated with the other test values. Also, the test methods were evaluated by plotting the estimated values of compressive strength vs. the measured values of compressive strength for each test. The results indicate that the least variability is shown in the impact strength test. So, among the test methods included in this study, the impact strength test is the most reproducible test: but the variability of test results for the other test methods is within acceptable limits for most engineering purposes. Strong linear relations between the point load strength index values and the UCS values were found for the coal measure rocks and the other rocks included in this study. The Schmidt hammer and the sound velocity tests exhibit significant non-linear correlations with the compressive strength of rock. In the sound velocity test, the data points are scattered at higher strength values. There is no clear relation between the impact strength values and the compressive strength values for the coal measure rocks. A weak non-linear correlation was found between the impact strength values and the compressive strength values for the other rocks. All test methods evaluated in this study, except the impact strength, provide reliable estimate of the compressive strength of rock. However, the prediction equations derived by different researchers are dependent on rock types and test conditions, as they are in this study. © 2001 Elsevier Science Ltd. All rights reserved.Öğe Multifactorial fuzzy approach to the sawability classification of building stones(2007) Tutmez B.; Kahraman S.; Gunaydin O.The performances of circular sawing with diamond impregnated tools were evaluated in stone processing plants located in some areas of Turkey. Samples were collected from these factories for the laboratory tests. Uniaxial compressive strength, tensile strength, Schmidt hammer value, point load strength, impact strength, Los Angeles abrasion loss and P-wave velocity were determined in the laboratory. Performance measurements and stone properties were evaluated by using the multifactorial fuzzy approach which is a special case of multiple objective multifactorial decision making for the sawability classification of building stones. Using three different decision functions, the sawing performances of diamond saws were classified into three categories: excellent, good and poor. It is possible to evaluate the sawability and select a suitable diamond saw for a new building stone by only some stone properties testing using the developed fuzzy classification system. © 2006 Elsevier Ltd. All rights reserved.Öğe Performance analysis of drilling machines using rock modulus ratio(2003) Kahraman S.The correlations between the modulus ratio and penetration rate of rotary and percussive drills were statistically investigated using the raw data obtained from the experimental works of different researchers. An inverse power law was found between the modulus ratio and the penetration rate of rotary and diamond drills. The penetration rate of rotary drills and diamond drills decrease with an increasing modulus ratio. The penetration rates of percussive drills increase with an increasing modulus ratio. There are significant linear correlations between the penetration rates of percussive drills and the modulus ratio. In one of the cases of percussive drilling a strong correlation between the penetration rate and the modulus ratio was found for the rocks having a porosity value lower 1.23 %. It can be concluded that the modulus ratio might be a representative measure of rock drilling efficiency. However, further study is necessary to check the validity of the derived equations for other rock types. The effect of porosity on the correlations between the modulas ratio and penetration rate needs to be further investigated.Öğe Performance prediction of a jumbo drill in ankara-pozanti motorway tunnel (Turkey)(2006) Kahraman S.; Ipek M.; Guleryuz U.; Gunaydin O.In this study, the performance prediction of a jumbo drill used in Pozanti-Ankara Motorway Tunnel (Kirkgecit-1) was investigated. The performance of the drill was observed in once every 50 meters of the tunnel route. Rock blocks were collected from each observation points for the laboratory tests. In addition, joint count was performed on the tunnel face in each observation point. Schmidt hammer, P-wave velocity, impact strength and density values of the rock samples were determined in the laboratory. For each observation point, volumetric joint count (JV), which is defined as the sum of the number of joints per meter for each joint set, was calculated from joint measurements. Penetration rates of the drill were firstly correlated with rock properties. It was found that there was no correlation between the penetration rate and intact rock properties. This is due to the fact that rock properties belonging to each observation point are approximately same. Then, penetration rates were correlated with Jv values and found strong correlation. Penetration rate linearly decreases with increasing Jv values. Concluding remark is that, if the intact rock properties are approximately same, drilling performance of jumbo drill depends largely on the discontinuities on the rock mass.Öğe Performance prediction of circular diamond saws from mechanical rock properties in cutting carbonate rocks(2007) Fener M.; Kahraman S.; Ozder M.O.Possibility of estimating the sawability of carbonate rocks from some mechanical rock property was evaluated using simple and multiple regression analysis. Hourly Production of circular saws was firstly correlated with rock properties and then, multiple regression analysis was performed. Rock blocks were collected from the factories for laboratory tests, and attempt was made to collect rock samples that were large enough to obtain all of the test specimens of a given rock type from the same piece. Linear, logarithmic, exponential and power curve fitting approximations with the highest correlation coefficient was determined for each regression. Results showed that sawability of carbonate rocks can reliably be predicted from compressive strength, tensile strength using simple regression equations.Öğe Predicting the sawability of carbonate rocks using multiple curvilinear regression analysis(2004) Kahraman S.; Fener M.; Gunaydin O.Performance measurements of large-diameter circular saws were conducted on 13 different carbonate rocks in marble factories located in Turkey. Rock samples were collected from the factories for laboratory tests. Cohesion, friction angle, uniaxial compressive strength, tensile strength, Schmidt hammer value, point load strength, impact strength, Los Angeles abrasion loss and P-wave velocity values were determined in the laboratory. Slab production and rock properties were evaluated using multiple curvilinear regression analysis and estimation models were developed. Advancing rate of saw, saw diameter, depth of cut, tensile strength and impact strength were included for the best model. Alternative and more universal models were developed, including each rock property in turn together with the rotational speed of the saw. The developed models were verified by statistical tests.It was concluded that the slab production of carbonate rocks using large-diameter circular saws can reliably be estimated using one of the developed models. The models which include Schmidt hammer value, point load strength, impact strength and P -wave velocity have practical and economical advantages for the stone industry. © 2004 Elsevier Ltd. All rights reserved.Öğe Predicting the Schmidt hammer values of in-situ intact rock from core sample values(2002) Kahraman S.; Fener M.; Gunaydin O.[No abstract available]Öğe Predicting the UCS of pyroclastic rocks from the slake durability index(2010) Kahraman S.; Fener M.; Gunaydin O.The prediction of the uniaxial compressive strength (UCS) from indirect methods is widely used for the preliminary investigations. In this study, the possibility of predicting the UCS from the slake durability index (SDI) was investigated for pyroclastic rocks. For this purpose, pyroclastic rocks were collected from 32 different locations in Cappadocian Volcanic Province of Turkey. The UCS and the SDI tests were carried out on the samples in the laboratory. The dry and saturated UCS values were correlated with the SDI values and strong exponential relations were obtained. However, it was seen that there is a little change in the SDI values over the dry UCS values of 25 MPa and the saturated UCS values of 15 MPa. Concluding remark is that the developed equations are valid for the pyroclastic rocks having dry UCS values of lower than 25 MPa or having saturated UCS values of lower than 15 MPa. © 2010 Taylor & Francis Group, London.Öğe Prediction of the penetration rate of rotary blast hole drills using a new drillability index(2000) Kahraman S.; Balci C.; Yazici S.; Bilgin N.Rotary blast hole drills were observed in several formations at different open pit mines and quarries. Rock samples were collected as near as possible to drilling locations and mechanical and physical properties of the total 22 rock samples were determined. Indentation tests were carried out on the block samples from the same formations. A new drillability index for the prediction of the penetration rates of rotary blast hole drills and the mechanical and physical properties of the rock formations was defined from force-indentation curves of indentation tests. A penetration rate model for rotary for blast hole drills was developed using this drillability index. It was seen that the model was valid for the formations having uniaxial compressive strength over 40 MPa and especially for carbonaceous rocks. The drillability index exhibits a significant correlation with the proportionality constant k defined in the model. It is also seen that significant correlations exist between the drillability index and rock properties suggesting that the proposed model may be used universally to estimate the penetration rate of rotary blast hole drills. (C) 2000 Elsevier Science Ltd. All rights reserved.Öğe Rotary and percussive drilling prediction using regression analysis(Elsevier Science Ltd, Exeter, United Kingdom, 1999) Kahraman S.[No abstract available]Öğe Sawability prediction of carbonate rocks from brittleness indexes(2004) Gunaydin O.; Kahraman S.; Fener M.Performance measurements of large-diameter circular saws were conducted on eight different carbonate rocks in marble factories located in some areas of Turkey. Rock samples were collected from these factories for laboratory tests. Uniaxial compressive strength, tensile strength and impact strength were determined in the laboratory. The brittleness of B3 (the ratio of compressive strength minus tensile strength to compressive strength plus tensile strength), the brittleness of B5 (the product of percentage fines in the impact strength test and compressive strength) and the brittleness of B8 (half of the product of compressive strength and tensile strength) were calculated from the test results. Hourly slab productions were correlated with brittleness indexes. It was concluded that sawability of carbonate rocks can best be predicted from the brittleness of B8.Öğe Sawability prediction of carbonate rocks from shear strength parameters using artificial neural networks(2006) Kahraman S.; Altun H.; Tezekici B.S.; Fener M.[No abstract available]Öğe The correlations between the mean particle size in grinding and physico-mechanical properties of igneous rocks(Grup Matbaacilik, 2009) Kahraman S.; Uçurum M.; Yo?urtçuo?lu E.Igneous rocks are ground for different purposes. Mean particle size (d50) can be a quantitative measure of grindability at the same grinding conditions. The prediction of d50 is useful for the mining engineers. For this reason, to investigate the relations between the d50 and physico-mechanical properties of igneous rocks, five different rocks including granite, basalt and andesite were tested in the laboratory. d50 values obtained from the size distribution plots were correlated with the corresponding physico-mechanical properties. Good correlations between the d50 and physico-mechanical properties could not be found using the simple regression analysis. However, the prediction equations having strong correlation coefficients were developed for the d50 using the multiple regression analysis. It was concluded that the d50 of igneous rocks can be predicted from the equations developed from the multiple regression analysis especially for preliminary investigations. The derived equations including index test values are also important for the practical consideration. Further research is necessary to check the validity of the derived equations for the other rock types.Öğe The effect of water saturation on the strength of marbles(International Society for Rock Mechanics, 2008) Kahraman S.; Gunaydin O.; Fener M.Uniaxial compressive strength (UCS), Brazilian tensile strength (BTS) and point load strength (Is) of rocks are commonly used for the rock engineering applications. These important rock properties are strongly influenced by the water saturation. In this study, to investigate the effects of water saturation on the strengths of marbles, the UCS, BTS and Is tests were carried out on eight different marble types in the laboratory. The evaluation of results showed that the strength losses due to saturation ranges from 5.0 % to 25.3 % for UCS, from 5.1 % to 20.9 % for BTS, and from 5.6 % to 14.4 % for Is, respectively. The ratios between saturated and dry strength ranges from 74.7 % to 94.9 % for UCS, from 79.1 % to 94.9 % for BTS, and from 85.6 % to 94.4 % for Is, respectively. Linear regression equations between saturated and dry-rock strength values were also derived. The saturated UCS, BTS and Is of marbles can be predicted from the dry UCS, BTS and Is using the developed equations. Keywords: Marbles; Water saturation; Uniaxial compressive strength; Tensile strength; Point load strength. © ISRM International Symposium - 5th Asian Rock Mechanics Symposium 2008, ARMS 2008. All rights reserved.
