Establishment of Surrounding Rock Structure Model of Gob-side Entry and Analysis On its Stability

摘要

This paper considers the characteristics of the surrounding rock deformation of gob-side entry, motion law of the overlying strata after mining and the structure of roadside supporting. The gob-side roof structure has been simplified as an elastic mechanical model which is composed of gangue in mined-out area, roadside packing and the roadside coal, and the anti-force on the main roof has been calculated under the conditions. By the use of controlling variables, the main factors of the antiforce on the main roof have been analyzed, which are backfill body width and backfill body elastic modulus, and the backfill body compression formula has been obtained. On this basis, using the method of UDEC numerical simulation, stress state of the key roof rock of the gob-side entry has been simulated, and rhe relationship of backfill body width and backfill body elastic modulus with roof convergence has been obtained.