Abstract
Deep mining near faults may easily cause rock bursts, which seriously threaten mining safety. Based on the engineering background of deep mining near fault in Yima coalfield, by collecting the rock burst events that happened near fault during deep mining, the correlation between fault structure and time-space features of rock burst was analyzed. The results show that the deep rock burst accounts for 84% in Yima coalfield at 600 m and 93% in the mining area within 1000 m from F16 fault. The risk of rock burst is positively correlated with mining depth and negatively correlated with the distance between mining area and F16 fault, and the frequency and intensity of rock burst near F16 fault increase significantly. Rock burst occurs in high stress concentration area, mainly in roadway, releasing energy level of 1.1 × 104 J–3.5 × 108 J, with impact damage range of 60–500 m. The mechanism of rock burst was explained from the view of the distribution of mining stress in surrounding rock. The stress of coal seam in deep mining near fault increases, and the disturbance effect of fault is obvious. Rock burst is easy to be induced under static and dynamic loads. The occurrence and mechanical characteristics of fault have different effects on rock burst and should be considered when evaluating the risk of rock burst.
Highlights
Rock burst is a dynamic phenomenon due to the sudden and instantaneous release of elastic energy in the surrounding rock, which poses a great threat to the safety of underground personnel and the operation of equipment [1,2,3]
Almost every rock burst event has different geological and mining conditions, which need to be explained by corresponding theories. e mechanism of rock burst can be further understood by counting the previous rock burst events and summarizing the basic conditions of their occurrence
It can be seen that the F16 fault is the main geological structure, which has an important role in the occurrence of rock burst in Yima coalfield
Summary
Rock burst is a dynamic phenomenon due to the sudden and instantaneous release of elastic energy in the surrounding rock, which poses a great threat to the safety of underground personnel and the operation of equipment [1,2,3]. Geological structure, and stress state of surrounding rock are the major objective factors that determine the risk of rock burst [9,10,11,12]. Research on the rock burst occurrence rule near fault structure in deep mining is necessary to safety production. Xu et al [17] analyzed the occurrence law of rock burst from the geological perspective and delineated the high-risk rock burst area in Yima coalfield. It can be seen that the F16 fault is the main geological structure, which has an important role in the occurrence of rock burst in Yima coalfield. Rough the cases of rock burst near the fault area, this paper analyzes its appearance characteristics and reveals the mechanism of fault structure on coal mine rock burst so as to provide theoretical reference for deep mining near fault to preventing rock burst The geomechanical properties of faults tend to be complex, so it is difficult to accurately grasp the mechanical properties and stress state of faults, which restricts the study of related theory and numerical simulation. rough the cases of rock burst near the fault area, this paper analyzes its appearance characteristics and reveals the mechanism of fault structure on coal mine rock burst so as to provide theoretical reference for deep mining near fault to preventing rock burst
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