As time goes on, some strip pillars will be unstable and collapse in the future then they are steay at formerly, those pillars become potential disasters while development of other industrial in old mining areas.At the same time, in order to extend the mine life, some mines have to consider to exploitate the former pillars.Deep pillar timeliness is more obvious, study the long-term stability of deep coal pilla has a positive role r to reduce disasters caused by coal pillar losing stability and can provide a...
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