The Law of Strata Behavior and Risk Assessment of Rock Burst During the Square Period in Deep Inclined Working Faces

In recent years, rock burst accidents have frequently occurred in deep mining operations in China's coal mines. With the gradual increase in mining depth of inclined coal seams in many mining areas, the threat of rock burst disasters in working faces has intensified. This paper employs a comprehensive approach, including theoretical analysis, numerical simulation, and field measurements, to analyze the movement of overlying strata and the distribution laws of abutment pressure in inclined coal seam working faces. A computational model for stress superposition on the working face and the solid coal side of the gate road is established. Based on stress control theory, a method for assessing rock burst risk in inclined coal seam working faces is proposed. By analyzing the calculated results of abutment pressure and numerical simulation results, the rock burst risk level of the working face is comprehensively determined. Building on theoretical analysis and field measurements, the relationship between deep mining pressure and rock burst in inclined coal seam working faces is further investigated. The results indicate that the theoretical model calculates a medium rock burst risk level during the square period of the working face, with abutment pressure reaching its maximum value. The microseismic events and energy release also peak, validating the rationality of the theoretical model. The numerical simulation results and field monitoring data collectively demonstrate that mining pressure manifestations are most pronounced during the square period of the working face. By combining the established model to assess the rock burst risk level, the research confirms the mining pressure manifestation laws during the square period. The calculated rock burst risk level aligns with field conditions, providing guidance for subsequent mining operations and rock burst prevention during the square period of the working face.