Abstract: When mining in the deep buried coal seams, the roof of the excavated gallery is usually broken due to the effect of the coal extraction. The broken roof could result in a safety hazard to the safe of the gallery construction. This paper presents the numerical analysis results on the effect of the camber arch support on the stability of the coal extraction galleries using the case history of 143down04 gallery in Dongtan Coal Mine. The results indicate that height of the camber arch has a significant impact on the deformation and stresses in the supporting system. The settlement at the gallery roof decreases with the increase of the camber arch height, but the axial stress and the bending moments in the roof beam increase. The optimized arch height in the case history was determined to be 15 cm. The other parameters for the supporting design was also determined. The settlement observed in the coal roof supported by the camber arches were reduced and the settlement was stabilized in a short period of time.

Key words: Deep Mining: Gallery Support: Broken Roof, Camber Arch Support