REVIEW OF ROCK BRITTLENESS EVALUATION METHODS AND DISCUSSION ON THEIR ADAPTABILITIES

Brittleness is one of the most important mechanical properties of rock materials. Accurate evaluation of rock brittleness has extremely high practical value and plays a crucial role in underground engineering and slope stability,rock drillability and cutability analysis in water conservancy,hydropower,transportation,energy exploration and development. Researchers from all over the world have established many brittleness evaluation indexes from physical parameters,mechanical parameters,and elastic parameters. However,there is no unified recognition and definition of rock brittleness yet. This article systematically reviews the methods of rock brittleness evaluation at home and abroad,classifies dozens of commonly used brittleness evaluation indicators,summarizes the basic principles and application status of existing brittleness indicators,and discusses the adaptability,advantages and existing problems of brittleness indicators. Finally,the future research direction of rock brittleness evaluation method is discussed.