Abstract: In order to formulate the ground pressure control measures for gently inclined orebody mining in north mining area of Xishimen Iron Mine， the ground pressure activity characteristic is summarized according to the field investigation. The ground pressure behavior of two sidewalls crashing and arch leg bending occurrs mainly around 35m in the hanging side of the mined-out area. The severity of ground pressure behavior decreases gradually with the increase of distance away from the upper goaf. The ground pressure behavior is consistent with the simulated ground pressure of the wedge body， which reveals that the ground pressure is caused mainly by the action of wedge body in the hanging side. The control measures are as follows: for ore body mining under the action of wedge pressure， the most suitable mining sequence is from the boundary of the mined-out area to the hanging side; the roadway should be perpendicular to ore body strike; arch supports with auxiliary sidewalls supports can control deformation effectively.

Key words: gently inclined orebody, highstress, roadway deformation, wedge, ground pressure control