Study of forecast of mine water inrush from the floor strata

Most water inrushes in coalmines in China occur from the floor strata and the source of water inrush mainly comes from the underground karst limestone aquifers, which differs considerably from that in other countries. Many theories and methods about predicating mine water inrush have been used. Based on a large number of mine water inrush cases in Feicheng coalfield, China. A new probabilistic method, called probability index of water inrush, is advanced to forecast mine water inrush from the floor strata. The ideas and the steps to obtain the probability index of water inrush are described together with the statistics of cases of water inrush in Feicheng coalfield.