Characteristics of deformation and damage of surrounding rock along the top roadway in the working face of an isolated island and its evolution law

In order to study characteristics of deformation and damage of surrounding rock along the top roadway in the working face of an isolated island and its evolution law, this paper takes a mine in Yangquan City, Shanxi Province, China, as the engineering background, and adopts FLAC 3D numerical simulation and on-site measurements to conclude that at different locations of the 15106 island face along the top of the roadway peripheral rock over the front face, the roadway in the excavation period and the mining phase all experience the asymmetric expansion of the plastic zone and gradually penetrate the plastic zone of the coal pillar, and overall experience the stage of the roadway sub-gang not penetrated and destroyed, the stage of the roadway sub-gang penetrated and destroyed, the stage of the development of the plastic zone of both gangs after penetrated and destroyed. In general, the roadway has experienced the stage of the sub-gang not penetrating and destroying, the stage of the roadway penetrating and destroying, and the stage of the roadway two-gang plastic zone development after penetrating and destroying. The asymmetric destruction of the roadway has the characteristics of rock selectivity and leaping through, and the rock layer of the roadway roof is relatively hard, and no large-scale destruction occurs; Through drilling and snooping, it was concluded that the large range of positive gang damage, the development of fissures, and the large depth of the roadway gang damage were the direct causes of the gang bulge, and that the size of the plastic zones of the two gangs of the roadway was positively correlated with the relative distance. During the monitoring period, the roadway displacement continued to increase, which is consistent with the situation in the coal mine.