Dynamic Superposition Support for Coupling Bearing Surrounding Rock of Gob-side Entry Retaining

Combined with the bearing structure characteristics of the backfill body and surrounding rock, the multi-region enhanced dynamic superposition coupling support technology is proposed for the large deformation problem of gob-side entry retaining. The coupling bearing coefficient model and numerical calculation model are used to analyze coupling bearing law of surrounding rock in gob-side entry retaining under different supporting technical conditions, and the coupling control effect is inverted. The research results have been successfully applied in engineering practice. Numerical simulation and engineering practice show that the smaller coupling coefficient, the larger and more unstable the deformation of the surrounding rock; on the contrary, the larger coupling coefficient, the smaller deformation and the stronger bearing performance of surrounding rock. Reinforcement of the backfill body, solid coal body, filling area roof and floor, reducing the deformation of surrounding rock and improving the coupling bearing effect of backfill body and surrounding rock, the surrounding rock control effect is better under the coupled bearing control scheme.