Abstract
Deep coal mining changes the original rock state, stress concentration occurs in the process of self-stabilizing adjustment of surrounding rock. At this time, rock burst is very easy to occur, which brings great threat to mine safety production. Based on catastrophe theory, the energy catastrophe criterion, displacement mode catastrophe criterion and entropy catastrophe criterion for surrounding rock system of deep buried tunnel are established in this paper. And the criteria are applied to the stability judgment of surrounding rock in Binchang coal mine. The analysis results show that the energy eigenvalue, displacement eigenvalue and entropy information eigenvalue for surrounding rock of deep buried tunnel suddenly jump and the surrounding rock loses stability when the excavation reaches the fourth step. The accuracy of the criterion is verified by laboratory test and FLAC3D numerical simulation. The above criteria can be used to judge the possibility of instability from different aspects according to the system mutation conditions, which can provide some reference for preventing local surrounding rock system instability in the process of excavation disturbance of deep buried tunnel.
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