In order to solve the problems such as strong mining pressure and large deformation of the surrounding rock or large amount of repair work in thick coal seam gob-side entry retaining, this research takes Tang'an coal mine in the Jincheng mining area as the engineering background, analyzes the defor-mation and damage characteristics of gob-side entry retaining, and proposes the control measures and corresponding technical solutions, by the method of underground observation, theoretical analysis and engineering test. Finally, the control measures are verified in the field. The research results show that the deformation of gob-side entry retaining is mainly manifested as the sinking of top coal, the splitting and skewing of roadside support, and the deformation of coal side and floor heave. The deformation and damage of the surrounding rock at different position shows an overall correlation. The deformation of the surrounding rock shows an overall “dislocation" mechanism. The deformation is mainly controlled by roof rotation and outward lateral movement, the inward deflection of the floor under horizontal stress. Under the combined action of the roof, floor, coal side, and roadside support, a “dislocation" deformation pattern towards the mining area is formed. Based on the “dislocation" deformation characteristics of the gob-side entry retaining, the following control measures are proposed, which mainly include thin and high strength concrete roadside support with pre-set angle, roof and coal side reinforcement support, the reinforcement support of retaining roadway “roof cutting control", regional hydraulic pre-cracking to pressure relief at the advance roof of the working face. Field tests and monitoring of the control measures show that the roof in the goaf is broken in time, the stress environment of the gob-side entry retaining is obviously improved, the roadside support is intact, and the effect of deformation control is remarkable. © 2023 China University of Mining and Technology. All rights reserved.
