Abstract: In order to explore the pressure law when fully mechanized mining workface going under slice pillar in close distance coal seams and study the method to control the roof which can prevent roof accidents, the method of field observation and theory analysis were studied in this paper. In two kinds of conditions which were the beginning of mining and common mining were studied in this paper. During the observation and Analysis on coal pillar of rock pressure, the pressure law of fully mechanized mining workface going under slice pillar showed out. The roof structure was also been studied and a lot of roof control methods were raised which successfully guided the field production. These results has enriched the roof control method of special fully mechanized working face geological special conditions.

Key words: Close coal seams, Through coal pillar, Ground pressure, Roof control