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ÖZMekanik kazı makinalarından beklenen yararlara ulaşabilmek için bu makinaların kazılacak kayaçların özelliklerine uygun olarak seçilmeleri gerekmektedir. Yüksek aşındırıcılık özelliğine sahip kayaçlar, kısa zamanda keskilerin körlenmesine neden olmaktadır. Bu durum, bir yandan keski tüketimini artırmakta, diğer yandan kazı verimini düşürmekte ve dolayısı ile kazı maliyetinin artmasına yol açmaktadır.Bu çalışma kapsamında, Zonguldak Bölgesi magmatik ve sedimanter olmak üzere 9 farklı kayaç türü üzerinde Cerchar aşınma indeksi (CAI), Norveç aşınma (AV) indeks deneyleri ile Schimazek aşınma (F) indekslerine göre aşındırıcılık deneyleri yapılmıştır. Üç farklı aşınma deney yönteminden elde edilen sonuçlar basit regresyon analiziyle birbirleriyle karşılaştırılmıştır.Schimazek aşınma indeks deneyi ile Cerchar aşınma indeksi ve Norveç aşınma indeks deneyi arasında doğrusal ilişkiler bulunmuştur. Deneylerden elde edilen sonuçlara göre incelenen kayaçların aşındırıcı ve oldukça fazla aşındırıcı oldukları bulunmuştur. ABSTRACTIn order to achieve the expected benefits from mechanical excavation machines, these machines must be selected in accordance with the characteristics of the excavated rocks. Highly abrasive Rocks cause fast cutter wear in short time. This increases the chisel consumption in excavation and reduces the efficiency, and thus increases in excavation cost.In this study, Cerchar abrasiveness index (CAI), abrasion value (AV) and Schimazek wear index (F) tests were carried out on 9 igneous and sedimentary rocks samples from Zonguldak Region. The results then evaluated with regression analysis to determine the relationship between different abrasion index values. According to the test results, rocks were classified as abrasive and extremely abrasive. The statistical analysis showed strong linear relationships between Schimazek wear index -Cerchar abrasiveness index, and Schimazek wear index -abrasion value.

Cerchar abrasivity index (CAI) test is widely used for determining the abrasivity of rocks. This test is applied to estimate bit life and determine the wear in various mining and tunneling machines. The results of tests in different laboratories have been showing some variations depending on type of test apparatus (classic or West) and tested specimen surface conditions. In this study, the effects of these factors on CAI tests were investigated. In this context, CAI tests were performed using two separate testing apparatus both on rough and on saw cut specimen surfaces of 13 different rock samples. The results indicated that there are some differences between rough and saw cut specimen surfaces. It was also founded that rough surface CAI values were generally higher than the saw cut surface values. In addition, the statistical analysis in these experiments revealed that there exist linear relationships between CAI values on rough and saw cut surface. Additionally, CAI values on rough surface is about 15% higher than CAI values on saw cut surface. However, it was seen that the type of testing apparatus has insignificant effects on CAI measurements. Because, CAI measured by Classical test device was found higher than CAI measured by West apparatus and the difference was about 1%.