Abstract
Considering the difficulty in measuring the model I fracture toughness of rocks, this study aims to develop a quantitative relationship between model I fracture toughness and strength parameters such as the tensile strength, the uniaxial compressive strength, and the Hoek-Brown (H-B) strength parameter m i . Based on the collected experimental data from the literature, a relationship between model I fracture toughness and tensile strength is derived statistically. The rock tensile strength can be determined using a closed-form relationship from the uniaxial compressive strength and the H-B strength parameter m i , which can be easily measured. Combining the two relationships, a new method is proposed to determine the model I fracture toughness conveniently. Finally, collected experimental data is used to validate the proposed estimating method.
Published Version
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