Abstract
In deep mining, much elastic energy is stored in rock mass due to the high geostress. Rockburst will be induced by accumulated energy during excavation. Meanwhile, because of blasting vibration energy in the host rock, there will be an obvious superimposed effect on the probability and intensity of rockburst. To explore the most reasonable and effective method for understanding rockburst problem under blasting, a deep roadway of Sanshandao gold mine was studied. On the basis of in situ geostress data, the accumulated energy of three-centered arch roadway after quasi-static excavation was derived. Then, a series of in situ blasting vibration were monitored, and the blasting vibration energy was calculated by employing the equivalent theory of elastic vibration boundary. Finally, the tendentiousness of rockburst was evaluated qualitatively with the superimposed energy. The results indicated that the disaster-driven energy was increased by 45.1% and 28.2% on different places of roadway. Also, the probability and intensity of rockburst would be raised.
Highlights
Nowadays, resource exploration has entered deep mining
Much elastic energy is stored in rock mass, and deeper buried depth leads to more energy
Xiao et al raised a new method for calculating energy release rate in tunnel excavation subjected to high in situ stress [7]
Summary
Resource exploration has entered deep mining. Much elastic energy is stored in rock mass, and deeper buried depth leads to more energy. Liu et al put forward a method for dynamic risk assessment and management of rockbursts in drill and blast tunnels [25]. These methods mentioned above are mainly based on theoretical derivations or numerical simulations. Based on the in situ geostress data and energy calculation method of circular tunnels, the accumulated energy of three-centered arch roadway in Sanshandao gold mine after quasi-static excavation was derived. The effect of blasting vibration on rockburst intensity was quantified, which provides theoretical guidance and supporting data for dynamic disasters of deep rock under blasting vibration conditions
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