Abstract
Rockburst is one of the major disasters that threaten the safety of personnel and equipment underground and affect the normal production of the system. At present, there are many kinds of research on rockburst occurrence mechanisms, but most of them are based on statics and do not consider the time-varying effect of surrounding rock state. Regarding the stress state and characteristics changing with time of the surrounding rock support structure and the internal parameters after the tunnel excavation is analyzed qualitatively in this paper, the concept of the “self-sustaining time-varying structure of the surrounding rock” is put forward. The “self-sustaining time-varying structure of the surrounding rock” is regarded as a nonperiodic time-varying system with a single degree of freedom, then its dynamic characteristics are analyzed by using the momentum theorem of the particle system. The results show that when the mass of the self-sustaining time-varying structure changes with time and d m / d t < 0 , the rockburst may be induced by the free vibration with increasing amplitude. The faster the d m / d t changes, the more violent the rockburst is. This explains the rockburst occurrence mechanism from a new angle and explains the phenomenon that most rockburst occurs when σ θ was lower than σ c better.
Highlights
A rockburst is defined as damage to an excavation that occurs in a sudden or violent manner and is associated with a seismic event [1,2,3,4]
Less attention is paid to the dynamic response of surrounding rock when the stress transitions from the initial state (b) to the intermediate state (c), and from the intermediate state (c) to the stable state (d)
If this state can exist, it indicates that the surrounding rock has not been fractured after roadway excavation
Summary
A rockburst is defined as damage to an excavation that occurs in a sudden or violent manner and is associated with a seismic event [1,2,3,4]. The rockburst occurrence mechanism is studied in combination with the time-varying mechanics theory by analyzing the self-sustaining structure of surrounding rock after tunnel and tunnel excavation. Less attention is paid to the dynamic response of surrounding rock when the stress transitions from the initial state (b) to the intermediate state (c), and from the intermediate state (c) to the stable state (d) If this state can exist, it indicates that the surrounding rock has not been fractured after roadway excavation.
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