CORRELATION BETWEEN EQUOTIP HARDNESS INDEX, MECHANICAL PROPERTIES AND DRILLABILITY OF ROCKS

Abstract

Selection of a jumbo drill and appropriate bit type are important factors affecting machine performance and unit costs when excavating a mine roadway or tunnel. The selection process can be optimized if the drillability, hardness and other mechanical properties of rocks are accurately measured. In this article, block samples collected at various locations around the world were initially prepared according to ISRM standards. Next, the Equotip hardness, Shore hardness, and mechanical properties were determined. In addition, the drilling rate index of the samples was measured and each sample was categorized based on its drillability. The relationship between Equotip hardness index, Shore index, drilling rate index, and other mechanical properties were analyzed. Simple regression statistics revealed that Equotip hardness index test could be reliably used to predict the drillability of rocks that have a compressive strength higher than 19 MPa and a drilling rate index lower than 70

Keywords

• Equotip Hardness Index, Drilling Rate Index, Drillability, Jumbo drill

KAYAÇLARIN EQUOTİP SERTLİK İNDEKSİ İLE MEKANİK ÖZELLİKLERİ VE DELİNEBİLİRLİĞİ ARASINDAKİ İLİŞKİLER

Abstract

Yeraltı maden galerileri veya tünel kazısı sırasında uygun delici makine ve uç seçimi, makine performansını ve birim maliyetleri etkileyen önemli faktörlerdir. Bu seçim kayacın delinebilirlik, sertlik ve diğer mekanik özelliklerinin doğru olarak ölçülmesiyle yapılabilir. Bu makalede, öncelikle yurt içi ve yurt dışından alınan blok numuneler ISRM standartlarına göre uygun boyutlarda hazırlanmıştır. Daha sonra, laboratuvarda Equotip ve Shore sertliği ile mekanik özellikleri belirlenmiştir. Ayrıca, her bir numunenin delinebilirliğini sınıflandırmak üzere delme oranı indeksi ölçülmüştür. Bu bağlamda Equotip sertlik indeksi ile Shore indeksi, mekanik özellikleri ve delme oranı indeksi arasındaki ilişkiler incelenmiştir. Basit regresyon analizlerinden dayanımı 19 MPa’ın üzerinde ve delme oranı indeksi 70’in altında olan kayaçlarda Equotip sertlik indeksinin delinebilirliğin tahmininde güvenilir olarak kullanılabileceği belirlenmiştir

Keywords

• Equotip Sertlik İndeksi, Delme Oranı İndeksi, Delinebilirlik, Jumbo Delici

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