Energy release law of roadway surrounding rock and energy⁃driven rock burst mechanism

The occurrence of rock burst is accompanied by a large amount of energy release. In this study，the mechan⁃ ical model of energy release of roadway surrounding rock is established，the law of energy release is analyzed，the rock burst mechanism caused by kinetic energy release is revealed，and a field case study is carried out. Results show that the kinetic energy released by the impact⁃body (which is defined by the rapid separation part of a certain range of coal mass in coal rib) nonlinearly increases with the increase of stress concentration factor or impact⁃bodywidth，but decreases nonlinearly with the increase of plastic zone width. As the influencing range of abutment pressure is steady，the re⁃ leased energy of elastic zone acting on the impact⁃body decreases nonlinearly with the increase of plastic zone width. The energy of dynamic failure driven by the roof and floor increases with the increase of the width of the impact⁃body and the thickness of the roof and floor，but decreases with the increase of plastic zone width in the coal. With the in⁃ crease of the elastic modulus of the roof and floor，the energy driven dynamic failure of the impact⁃body decreases and tends to be stable，but the energy driven by the coal in the elastic zone increases linearly. In the process of energy re⁃ leasing in near⁃field surrounding rock，the energy adjustment of roadway wall is inconsistent，resulting in the generation of high energy gradient in the coal body，which makes it easier for the coal body to release impact energy to free face of the roadway. As the impact⁃body width increases，not only the released energy of impact⁃body increases，but also the driving energy in the elastic zone and the roof and floor increases. It is easy to make the ratio of the sum of elastic strain energy stored in the impact⁃body and the released energy of roof and floor and elastic zone to the consumed en⁃ ergy of impact⁃body failure larger than 1，reaching the critical value of rock burst occurrence.