Abstract
Based on RFPA software, the numerical simulation of rock burst in circular roadway is carried out under different horizontal stresses. The paper studies the distribution of stress field, the crack propagation and acoustic emission characteristics in the process of rock burst. The results show that the stress moves and the concentration of compressive stress appears on left and right sides of roadway after excavation of the roadway, and tensile stress zone appears at the top and bottom of the roadway. The shear fracture on the roadway’s left and right sides is more serious. The larger the horizontal stress is, the earlier the energy releases and the higher the total energy is.
Highlights
The world's oldest rock burst occurs in Britain in 1738
Many scholars generally hold the thought that rock burst is a kind of dynamic disaster, and due to underground excavation under the condition of high ground stress, the stress redistribution, the elastic energy stored in rock mass suddenly releases, which results in the rock blowout, loose, particle ejection and even throwing damage[2]
In the literature[3], the instability and rupture of rock in unloading process reappears with RFPA2D, and the mechanism of rock burst is discussed
Summary
The world's oldest rock burst occurs in Britain in 1738. The study on crack evolution process of rock burst is little. Numerical simulation technology has become an important method to research rock burst. In the literature[3], the instability and rupture of rock in unloading process reappears with RFPA2D, and the mechanism of rock burst is discussed. The literature[4] simulates the excavation process of rock cavern with numerical method, and analyze the release of elastic energy of rock burst. The literature[5] simulates the rock burst of circular roadway under the condition of unloading process with RFPA. In the literature[6], the instability rupture of deep roadway caused by dynamic disturbance is simulated, and the mechanism of rock burst triggered by dynamic disturbance is revealed
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