Abstract: Taking the return air roadway of Jiangjiahe coal mine as the study example,the in-situ measure method and industrial test method are adopted to analyze the cause of the floor heave,the analysis results show that the compound floor heave is produced under the influence of surrounding rock characteristics,in-situ stress, hydraulic nature,mining influence of nearby working face and supporting structure,the rock characteristics and hydraulic nature of the roadway floor are the essential influence factors of the roadway floor heave.Based on the above analysis results, the prestressed grouting comprehensive reinforcement scheme in whole section is proposed,the failure strain of roadway surrounding rock is controlled effectively.

Key words: Mudstone, Compound floor heave, Rheological, Prestressed grouting comprehensive reinforcement method in whole section