Abstract: Fully-mechanized mining technology is difficult to apply in large inclined coal seams, due to the hard stability control of fully mechanized supports under such conditions. Based on the 3up509 large inclined and mining height coalface in Gaozhuang Coal Mine, the mechanical analysis of support stability (dumping and slipping) was done during special mining period (roof fall or passing through fault) from inclined and strike direction in this paper. The analysis results show that the minimum working resistance for keeping support stability in 3up509 coalface should be not less than 4 743 kN, and the support selection of 6 600 kN resistance is reasonable. In addition, based on the analysis of the mechanics, the technical measures of increasing setting load of support, adding bottom adjustable jack device in support base, installing anti-inclining device on the top beam of support and changing movement way of support have been proposed, which can effectively prevent supports to happen slipping and in- clining during coalface process, and greatly improve the overall stability of supports in coalface.

Key words: large inclined, large mining height, special mining period, support stability, lateral stress