Analysis on Fracture Mechanics of Unstable Rock

Abstract

Unstable rock is a kind of global geological disaster with high frequency. This paper, considering three kinds of combined loads which are gravity, fracture water pressure and seismic force, constructs a unstable rock mechanics model and it uses a fracture mechanics method to deduce the composite stress intensity factor of the type I -II. Based on the maximum circumferential stress theory, this article calculates the theoretical fracture angle by triangle universal formula.

Calculation Method of Bonding Section of Joint Surface of Dangerous Rock Mass Based on Amplitude Ratio

“…To study the influence of the damage and cracking of the bonding surface on the stability of dangerous rock masses, relevant scholars started to analyze the regularity of joint failure and rock fracture mechanism from fracture mechanics and damage mechanics [8] and achieved certain results. Chen et al [9,10] determined the instability and failure mechanism of dangerous rock masses under compression-shear and tensile-shear fractures and established the calculation formula of dangerous rock stability coefficient based on fracture mechanical parameters. He et al [11] and Wu et al [12] used fracture mechanics to analyze the stress changes during the failure of tensile and shear dumping dangerous rocks and determined the influencing factors in the stability of these rocks.…”