The air impulsion coupling model with roof caving and its difference solution under closed goaf

Based on Newton secondary law and air dynamics principle,the incidental hurricane disaster caused by abruptly roof caving over extent in mine mining process was analyzed,the air impulsion coupling model with roof caving under closed goaf was built,and its difference solution was discussed.With the help of numerical solution,roof movement law,impact time,and the varying one of compressed air flow within roadways under closed goaf were studied.