Rational Malposition Research of Simultaneous Mining Working Faces in Close Distance Seam Group

In order to determine rational malposition of simultaneous mining working face in close distance seam group,using theoretical analysis combined with numerical simulation,it is obtained that the lower working face not only can avoid the influence of the abutment pressure of the upper working face,but also maintain the integrity of the roof effectively when the malposition should be 40~45 m,which is verified by the observation of advancing abutment pressure under working face.