Abstract: In response to the serious problem of deformation and fracture caused by repeated mining gob-side entry retaining in the lower coal seam, the reasonable location and the support parameter between the roadway and excavation have been studied by using numerical simulation filed practice and theoretical calculation. The result has shown that a certain range of stress-relaxed area below the goaf arises after the upper coal seam mining, which creates favorable conditions for gateway layout; However a certain range of stress-concentrated area below the residual pillar arises, and the influence outside scope of which spread to 10.8-11.54 m from coal pillar in coal seam 3+4. Adopting the method of multipoint displacement monitoring roof-floor and lanes convergence, the result has shown that the amount is within the controllable range. The arrangement and support design for the remained gateway along goaf, according to engineering practice, is reasonable. Research results have provided the basis and guidance for the reasonable layout and support design of gob-side remained gateway under similar conditions.

Key words: close coal seam, remained gateway along goaf, layout of roadway, strata control observation