Abstract
Rock burst is a catastrophic phenomenon that often occurs in underground rock mass engineering. In order to reveal the essence of rock burst of a hard roof in the process of roadway excavation, the particle discrete element method is used to establish a roadway model and simulate the disturbance of harmonic dynamic load based on the analysis of a rock burst accident in a deep mine. The crack field, stress field, displacement field, and kinetic energy of roadway surrounding rock disturbed by cyclic dynamic load were analyzed, and the disaster mechanism of roadway impacting roof instability was discussed. The results show that, compared with the roadway support structure under static load that can give full play to its control function of surrounding rock, the roadway surrounding rock will collapse and lose stability in a large area under the roof cyclic dynamic load, and the ordinary supporting structure cannot give full play to its control function of surrounding rock, resulting in the surrounding rock destruction and supporting structure failure. In addition, the essence of rock burst in a hard thick roof is due to the instantaneous superposition of static stress and dynamic load, leading to the instantaneous instability and collapse of roadway roof in a large area. The research is of great significance to further understand the deformation and failure mechanism of roadway surrounding rock under strong impact load, to guide the safe production and prevent the occurrence of rock burst hazard in underground rock mass engineering.
Highlights
Under the deep rock mass engineering, due to the complex geological occurrence and mining technical conditions, the occurrence frequency of impact dynamic disaster is increasing, and its destruction level is becoming more and more prominent [1,2,3,4,5,6,7]
After the first dynamic load, the roof and the two sidewalls were damaged and cracked, respectively. e main cracks in the roof were vertical cracks, and several vertical cracks were connected in a range to form the broken zone. e damaged cracks mainly appeared in the top of the coal, and the broken zone of the roof arch was basically formed
After the third dynamic load, the impact energy mainly acted on the sidewalls, and the damage area of the sidewalls began to connect with the damage area of the roof
Summary
Under the deep rock mass engineering, due to the complex geological occurrence and mining technical conditions, the occurrence frequency of impact dynamic disaster is increasing, and its destruction level is becoming more and more prominent [1,2,3,4,5,6,7]. Erefore, studies of rock burst mechanism and control technology are the key problems to ensure the safe production of a deep mine. In the study of rock burst in underground rock mass engineering, many studies have been carried out to understand the deformation characteristics and failure mechanism of roadway surrounding rock, and a series of effective control methods are put forward [12,13,14,15,16,17,18,19,20,21]. With the continuous increase of the mining depth, the frequency and intensity of its occurrence tend to increase. erefore, it is of great significance to study and discuss the characteristics of roadway rock burst
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