Yazar "Tunusluoglu, M. Celal" seçeneğine göre listele

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    A new empirical approach for prediction of rock mass strength based on a strength reducing curve zone instead of unique strength reducing curve
    (International Society for Rock Mechanics, 2010) Sonmez, Harun; Kasapoglu, K. Ercin; Coskun, Aycan; Dinc, S. Ozge; Tunusluoglu, M. Celal
    As is well known from rock mechanics literature, the mechanical parameters of a rock mass cannot be obtained by conventional laboratory tests due to the difficulties encountered in the preparation of cores from a rock mass containing discontinuities. To overcome these difficulties, researchers have focused on developing empirical equations for predicting stress-strain behavior of a rock mass, including based on measurements of the discontinuity patterns. However, the UCS value of rock mass (UCS RM ) can be predicted by decreasing UCS i based on quality of rock mass such as Rock Mass Rating (RMR), Geological Strength Index (GSI), Q value, etc. For this reason, an empirical equation in a unique reducing curve form has limited application in generalizing on the prediction of UCS RM from particularly soft rock mass to hard rock mass. In this study, a new empirical approach is developed to be used for predicting of strength of rock masses from soft to hard rock masses. In addition, a new procedure for defining of the disturbance effect on the strength of rock mass is introduced to the new empirical approach in conjunction with Hoek and Brown failure criterion. © 2010 International Society for Rock Mechanics. All rights reserved.
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    Assessment of the instability mechanism of spillway with reference to an earthfill dam in the northwest Turkey
    (Springer Heidelberg, 2014) Tunusluoglu, M. Celal
    Dams are one of the most important engineering structures that need detailed geological and geotechnical investigation since several types of engineering problems are encountered during construction and postconstruction phases of dams. In May 2010, during the spillway construction of an earthfill dam from the northwest Turkey (Akcin Dam), toe buttress supporting the spillway was disturbed, and a mass movement occurred at the right bank. Furthermore, the spillway started to move in the dip direction of the slope, and the mass movement direction at the right bank. Thus, shear diagonal cracks on the walls of the spillway constituted. This study aims to describe the slope failure mechanism and the damages on the spillway of the Akcin Dam and to suggest effective remedial measures. In the first stage of the study, the mechanism of the failure was investigated, and it was found that claystone-tuff contact acting as a weakness plane comprised the failure surface. Then, the seismicity of the study area was assessed, and the peak ground acceleration was determined as 163 gal. Finally, as the necessary remedial measures, drainage control, grouting, reinforcement of buttresses, and concrete piles front of the tuffite mass were suggested to provide the dam safety.
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    Landform effect on rockfall and hazard mapping in Cappadocia (Turkey)
    (Springer, 2011) Zorlu, Kivanc; Tunusluoglu, M. Celal; Gorum, Tolga; Nefeslioglu, Hakan A.; Yalcin, Ali; Turer, Dilek; Gokceoglu, Candan
    The Cappadocia region has unique geomorphological features resulting from differential erosional processes which make it very attractive to tourists. Besides the fairy chimneys for which the area is best known, there are also impressive buttes and mesas. Buttes and mesas are formed in regions having flat-lying strata in which the uppermost levels are composed of well-cemented limestones and granular ignimbrites, whereas the lower parts and slopes consist of low-durability tuff and ignimbrites. This durability difference results in serious rockfall events. This study involves two-dimensional rockfall analyses in and near the Avanos, Zelve, and Cavusini areas, where volcano-sedimentary units of Neogene age outcrop, to provide a rockfall hazard map in which areas of tourism activity are also considered.
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    Liquefaction severity mapping based on SPT data: a case study in Canakkale city (NW Turkey)
    (Springer, 2018) Tunusluoglu, M. Celal; Karaca, Oznur
    Soil liquefaction is one of the major causes of damage to buildings and structures during earthquakes. Very shallow groundwater table in Quaternary alluvial deposits and the seismic properties of a region can cause a significant damage to buildings and infrastructure dependent on liquefaction. Canakkale city is located in the first-degree seismic hazard zone according to the earthquake zone map of Turkey. A large part of the Canakkale settlement area is located on unconsolidated alluvium recently deposited by the Saricay River. In this survey, the liquefaction potential of the Canakkale settlement area was investigated based on the liquefaction severity index and liquefaction potential index for two possible earthquake scenarios with a moment magnitude (M (w)) and peak ground acceleration (a (max)) of 7.5 and 319 gal and 7.0 and 222 gal, respectively. In addition, these two methods were analysed using the peak ground acceleration (a (max) = 141 gal) value measured at the Canakkale station during the 2014 Aegean Sea earthquake. Based on the results of the analyses, liquefaction susceptibility maps of Canakkale city were produced for different a (max) values. The study involved three stages: field work, laboratory testing, and generation of the liquefaction severity maps. Geotechnical boreholes at 151 locations were drilled and Standard Penetration Tests (SPT) performed. Thereafter, natural moisture content, unit weight, grain-size distribution, and Atterberg limits were determined by means of laboratory testing. Finally, Quaternary alluvial deposits in the study area were divided into five classes representing very low-to-very high liquefaction for three a (max) values.