Roof separation characteristics of laminated weak roof strata of longwall roadway

摘要

The roof separation was investiqated in a coal mine as part of the site characterization of roof strata deterioration in a longwall roadway. The of laminated, weak roof strata was initiallycharacterized as the maximum separation, effect of geological setting on separation and the effect of mining activities (heading d evelopment, time-dependent and longwall extraction) on separation. Then the separation process was studied, so as to answer the questions of: when the separation occurs; where the tion is located and what geological setting it relates to; how large of the separationo is; and how the separation