Abstract: Aimed at complicated geological conditions of large inclined angle seam with soft coal, soft roof, and soft floor and difficulties for ground control in rotary and full-mechanized longwall mining with high height in Panbei coal mine, field observation and numerical simulation have been used to investigation into strata behaviors of No.12124. Based on strata behaviors analyzing, the ground pressure mechanism have been opened out with longwall and high height rotation mining in complicated geological and technical conditions. During the process of rotary mining, with the mining-induced stress affected after No.12125 longwall panel mined, the co-action of abutment pressure concentration developing and powered support periodical supporting is the key factor to result in roof fracturing, roof falling, coal collapsing in working face, and large deformation of entries’ surrounding rocks. Some technique have been implemented and practiced, which mainly includes as follows：to pave network and use steel beams to strengthen the roof salability; to apply anti-skid jack to connect hydraulic support to conveyor and advancing jack to control the decline of conveyor; to use bolting-wire-mesh to control stability of entries surrounding rock in rotation areas; to reinforce timbers to control stability of entries advanced about 10 m to working face. Engineering practice show that research plays an important role in safely mining and provides technologies for rotation mining in complicated geological conditions.

Key words: large inclined angle and thick seam, rotary full-mechanized mining, strata behaviour, surrounding rock stability, mining-induced stress