The roof separation was investigated in a coal mine as part of the site charac- terization of roof strata deterioration in a longwall roadway. The separation of laminated, weak roof strata was initially characterized ...The roof separation was investigated in a coal mine as part of the site charac- terization of roof strata deterioration in a longwall roadway. The separation of laminated, weak roof strata was initially characterized as the maximum separation, effect of geologi- cal setting on separation and the effect of mining activities (heading development, 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 separa- tion is located and what geological setting it relates to;how large of the separation is;and how the separation propagates.展开更多
文摘The roof separation was investigated in a coal mine as part of the site charac- terization of roof strata deterioration in a longwall roadway. The separation of laminated, weak roof strata was initially characterized as the maximum separation, effect of geologi- cal setting on separation and the effect of mining activities (heading development, 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 separa- tion is located and what geological setting it relates to;how large of the separation is;and how the separation propagates.