Abstract: To solve support dismantling problems caused by big cross-section finishing cut and to control strata movement in solid backfilling mining face，this paper has adopted the theoretical analysis and FLAC^3D numerical simulation method to study laws of surrounding rock deformation and failure mechanism of finishing cut. Then the comprehensive support technology of anchor (rope) mesh reinforcement, temporary support of “#” type wooden cogs filled with grouting and permanent support of finishing cut grouting have been put forward. In addition，the supporting parameters of concrete pier consisting of wooden cogs has been optimized. The results have shown that when the reasonable spacing of concrete pier is 2 000 mm, the pier bearing capacity can satisfy the requirement of temporary support. The technology has been applied in Yangzhuang coal mine of Huaibei Coal Mining Group, and the accumulated sink value about 80 m above the working face has been only 60 mm, which has indicated that surrounding rock deformation control of finishing cut is well controlled.

Key words: solid backfilling coal mining, finishing cut, support, strata control