Abstract
Through the establishment of structural mechanics model, this paper analyzes the fracture of super thick rock stratum. Through the model, it can be seen that the fracture of low-level super thick rock stratum produces large elastic energy release and dynamic load, which is easy to produce disasters such as rock burst. The numerical calculation shows that under the influence of low hard and thick rock stratum, the leading area of coal mine roadway will produce energy concentration, and the coal pillar will also produce energy accumulation. Thick rock stratum is in bending state and has large bending elasticity. Coal pillar has large compression elasticity, which is the main reason for rock burst. The accumulation of elastic properties of overburden and rock burst caused by coal pillar energy storage can be effectively controlled by using advanced presplitting blasting, coal seam drilling pressure relief, and strengthening support.
Highlights
In China, the geological conditions of coal mine are complex, and the underground mining is gradually developed from shallow to deep
In the process of coal mining, rock burst caused by many factors, such as improper mining design, coal pillar setting, unknown geological conditions, and high in situ stress, has caused huge casualties and property losses. e rock burst disaster in engineering practice has challenged the existing accident mechanism research, treatment scheme, and prediction theory
Jiao et al [3] analyzed the correlation between fault structure and temporal and spatial characteristics of rock burst by collecting rock burst events occurred near fault in the process of deep mining
Summary
In China, the geological conditions of coal mine are complex, and the underground mining is gradually developed from shallow to deep. Jiao et al [3] analyzed the correlation between fault structure and temporal and spatial characteristics of rock burst by collecting rock burst events occurred near fault in the process of deep mining. He et al [4, 5] developed the key technologies such as roof directional presplitting technology, negative Poisson’s ratio high prestressed constant resistance support technology, and coal gangue plugging support technology, which are conducive to reducing the stress concentration of coal pillar and rock burst accidents. Rough theoretical analysis, numerical calculation, and field engineering practice, this paper analyzes the occurrence mechanism and control measures of rock burst from the perspective of energy distribution. e characteristics of advance and lateral energy distribution of roadway under low-level and thick rock stratum are put forward. e strategy of controlling rock burst by means of advanced presplitting is put forward
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