关键词: 固体充填沿空留巷, 围岩稳定性控制, 充实率, 矸石带强度, 矸石带宽高比

Abstract: In this paper，the gangue lane of 04(south)-2 workface with gob-side entry retaining in 63rd mining district，Jining No.3 coal mine，has been set as the engineering background. The concept of cooperative control system including overburden layers and gob-side entry retaining with solid backfilling has been put forward. Also the support characteristic of key components in such cooperative control system have been analyzed. Based on such indexes as the roof-allowing subsidence and mining cost，three parameters of affecting surrounding rock stability in roadway are obtained by using FLAC3D. In other words，the entry can be controlled stably under three conditions: 1) filling ratio of working face achieves up to 80%，2) strength of Gangue belt reaches 4 MPa，and 3) width/height ratio is 1∶1. Combined with the specific geological conditions of Jining No.3 coal mine，enhanced support plan for gob side entry has been proposed. The results from field test show that the roadway will be well maintained when the maximum convergence between roof and floor is approximately 300 mm and the side to side convergence amount is 240 mm.

Key words: gob-side entry retaining with solid backfilling, surrounding rock stability control, filling ratio, strength of gangue belt, width/height ratio of gangue belt