Study on Failure Characteristics and Rock Burst Mechanism of Roadway Roof under Cyclic Dynamic Load

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.

Research and Application of Rock Burst Hazard Assessment of the Working Face Based on the CF-TOPSIS Method

“…Hazard Assessment. Table 1 is imported into the improved CRITIC objective weighting model and then substituted into equation (7) together with the subjective weight obtained by FAHP, which yields the ideal evaluation index for rock burst factor assessment, as presented in Table 2. 1 reveals diferences in the degree of infuence of diferent rock burst criteria on rock burst events.…”

“…Numerous scholars have conducted extensive research on predicting rock bursts [5]. Teir proposed measures can be categorized into mine-wide prediction (intelligent hazard-level judgement), regional prediction (utilizing three spatialtemporal monitoring methods), and local prediction (employing a multiparameter monitoring and early warning index system for rock bursts) [6][7][8][9][10]. Given the complexity of factors contributing to rock bursts, evaluating the level of rock bursts in mines can be challenging.…”

Acoustic Emission Characteristics and Initiation Mechanism of Instantaneous Rock Burst for Beishan Granite

“…Based on the assumption of static and dynamic stress coupling, Cai et al [17] studied the mechanism of rock burst and proposed four quantitative evaluation methods, which provided a method for understanding the mechanism of rock burst and monitoring rock burst. Based on a rock burst accident in a deep mine, Zheng et al [18] analyzed the crack feld, stress feld, displacement feld, and kinetic energy of roadway surrounding rock under cyclic dynamic load by using a particle discrete element method and discussed the instability mechanism of roadway rock burst roof. Si and Gong [19] conducted triaxial unloading compression tests on granite specimens to investigate the efects of the three-dimensional stress state and unloading rate on the rock burst mechanism.…”

Mechanisms and Models of Attenuation of Shock Waves through Rock Formations

“…Tan et al proposed the "Stress Relief-support Reinforcement" synergistic technology for preventing a rock burst in deep roadways, studied the energy release mechanism of coal bodies and analyzed the failure characteristics and types of the surrounding rock due to different energy releases. Zheng et al [27] Proposed that 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 fulfil its control function of the surrounding rock, resulting in the surrounding rock destruction and supporting structure failure. Zhang et al [16] evaluated the abutment stress applied to the roadway surrounding rock by constructing an abutment stress transfer model after roadway excavation.…”