عنوان مقاله [English]
In the recent decades, the study of rock brittleness in infrastructure projects was addressed by different researchers. Unfortunately, a universally accepted definition of rock brittleness has not been presented yet. Furthermore, due to the lack of access to the equipment required and complexity and time consuming of the preparation and testing procedures of direct measuring of rock brittleness, indirect indices were mainly carried out. One of the most important Brittleness Indices, which has been widely used in various rock mechanic projects, is strength based brittleness index. The main objective of this study is to provide a new index on the basis of uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS) for evaluating the rock brittleness. For this purpose, by reviewing the existing strength-based indices, a general equation was firstly suggested for the new index. Then, an integrated approach based on the statistical analysis and probabilistic simulation was applied in order to calculate the coefficients of suggested index. According to the obtained results, the values of 0.807 and 0.485 were proposed for UCS and BTS coefficients, respectively. Using the suggested index, it is possible to predict the rock brittleness with the value of R2 equal to 0.88.
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