Abstract: Selecting the first mining project at the -230~-290 m middle section of an iron mine as the research object, the space-time rule of filling body for controlling the movement of stope surrounding rock in the large-diameter long-hole with the delayed filling open stoping method has been studied in methods of field monitoring of multipoint displacement extensometers and numerical simulation. The three-dimensional mechanical structure model of abutment pressure for the movement control of overlying rock mass has been established in this paper. The results indicate that the movement and deformation of surrounding rock could be effectively controlled as long as the stope of 15-meter width has been filled within the demurrage time. The footwall becomes the main bearing structure to support overlying rock mass. The capacity of the cement filling body is limited to support overlying rock mass while it is a valid constriction of the movement and deformation of overlying rock mass. The maximum vertical deformation of overlying rock mass is 39 mm and there is almost no difference between the ultimate deformations of surrounding rock at the room and pillar. So the ground pressure is not obvious.

Key words: filling body, movement and deformation of surrounding rock, bearing pressure arch, space-time rule, numerical simulation