Study on Underlying Seam Mining Affected to Upward Mine Transportation Roadway

The underlying seam mining would cause an unfavorable influence to the mine transportation roadway for the upward seam mining.ln order to determine the failure scope and degree of the mine transportation roadway influenced by the underlying seam mining as well as to set up the design of the underlying seam minin g plan and to set up the reinforcement measures of the mine transportation roadway, the FLAC3D software was applied to the simulation on the displacement and defor mation conditions of the mine transportation roadway as well as on the stress distribution of the rock strata in the mine roadway.The limit balance theory in combination with the features of the mine roadway surrounding rock and support system was applied to analyze the deformation failure causes of the mine roadway.The study result s showed that the mining of No.21040 coal mining face would not affect to the stability of the mine roadway.After the mining of No.21060 coal mining face completed, th e mine transportation roadway liner at the 280- -500 m section of the mine roadway was failure in different degree And the mine transportation roadway was seriously fa ilure at the 240- 440 m section of the mine roadway.The strength of the mine roadway surrounding rock was low and the integrality of the surrounding rock was poor.Th e failure of the mine roadway liner caused the support resistances reduced and the rock stress obviously increased in the mine roadway would be the cause to make th e deformation failure in serious.