Abstract: Based on the analysis of stratum structure of wall rock of Gucheng Colliery, rock mechanical parameter test and wall-rock stability classification were made. It was concluded that the main north roadway at 850m level in the colliery is of typical “instable wall rock roadway (Class IV)”. In view of this, compound support mode was proposed and the support capability of inverted arch analyzed. The results indicate that the compound support mode can make the surrounding supporting body to form an enclosed structure, thus facilitating the improvement of the roadway support effect.

Key words: Deep ground pressure, Roadway stability, Inverted arch, Grouted bolting, Grouting reinforcement