Failure analysis and control measures of deep roadway with composite roof: a case study

Abstract There is great variation in the lithology and lamination thickness of composite roof coal-measure strata; thus, prone to delamination falling, it difficult control surrounding rock when developing roadway such strata. In deep mining, stress environment complex, mechanical response mass different from that shallow mass. For composite-roof excavated mass, key safe efficient production mine ensuring stability roadway. The present paper obtains typical failure characteristics deformation mechanisms with a buried depth 650 m at Zhaozhuang Coal Mine (Shanxi Province, China). On basis determining reasonable cross-section shape according regions, divided into an unstable layer, metastable stable layer. controlled layer are regarded as small structure while large structure. A superimposed coupling support technology structures multi-level prestressed bearing arch formed by strong rebar bolts highly cable put forward. provides good application results field. study thus theoretical technical guidance for ground under similar geological conditions.