Technique based on “double maps” for assessment of water inrush from roof aquifer and its application——with New Shanghai No.1 coal mine at western edge of Ordos basin as example

To solve the difficult problem of forecast and evaluation of water inrush from roof, on the basis of proposing the water abundance index and water inrush risk index, taking New Shanghai No.1 coal mine at western edge of Ordos basin as research object, the maps of water abundance index and and water inrush risk index were used to to evaluate water inrush risk from roof in 3 coal mining face. The results showed that coal mining at water-abundant zone and risky zone of water inrush was the necessary condition for water inrush from roof.