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    EFFECT OF PHYSICAL AND MECHANICAL PROPERTIES OF ROCKS ON THE IMPACT HAMMER PERFORMANCE IN Nİ?DE PROVINCE QUARIES
    (Chamber of Mining Engineers of Turkey, 2020) Sari, Mehmet; Yilmaz, Tevhit; Çomakli, Ramazan
    In this study, the effects of physical and mechanical properties of the rocks on the performance of impact hammers used to crush boulders in muck piles produced after drilling and blasting were investigated for seven different quarries operating in Ni?de province. For this purpose, the muck piles were analysed using image processing method to determine the amount of the boulders. Total operating time and breaking rate of the hydraulic impact hammers were measured during a secondary breaking task for oversized boulders. Hydraulic hammers with the similar specifications were employed in all quarries visited in this study. In this regard, it was possible to investigate the relationships between hydraulic hammers' instantaneous production rate with the physical and mechanical properties of the rocks by simple regression method. Accordingly, significant linear relationships in various levels were found between the physical-mechanical properties of the rocks and hydraulic hammer performance. At the end of the study, a multiple linear regression equation was proposed to estimate instantaneous production rate of the impact hammers based on the independent parameters. © 2020 Union of Chambers of Engineers and Architects of Turkey. All rights reserved.
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    Investigation of the relationship between the mineral shape properties and destruction specific energy in granitic rocks
    (Union of Chambers of Engineers and Architects of Turkey, 2017) Çomakli, Ramazan; Atici, Ümit
    One of the mechanical property of rocks is destruction specific energy that estimated from the area (integral) under the stress-strain curve in unconfined compression test. The minerals in the rocks are effective on the mechanical properties of the rocks. In this study, the relation between destruction specific energy and mineral shape properties were investigated. The unconfined compressive tests were performed on nine different rock samples and the destruction specific energy values were estimated with calculating the area (integral) under the stress-strain curve for each rock sample. The texture coefficient approach was used for determining of the mineral shape properties and the texture coefficient values were calculated for each rock sample. The results were analyzed with using linear regression analyze method and a strong relation was found between destruction specific energies and the texture coefficients of rocks.