Abstract: According to the upward access filling mining scheme of the boundary ore body, the author accomplishes the numerical simulation of the impact from the underground mining methods on the high and steep slope stability. The numerical simulation of the large deformation of discrete element, the finite element static force and the slope stability under blasting dynamic load may be obtained. The calculating results demonstrate that the access and every-other-stope exploration method, with a vertical ore body layout of 4m height and 4m breadth and timely concrete filling, will acquire a safety factor of 1.50. Therefore, the stope production beside the nearest slope has not lead to connecting plastic zones or slip bands. Under the blasting dynamic load, the vibration velocity of the nearest slope toe will reach 3.2 cm per second, which is within the slope allowing limit. The discrete element calculating results show that after exploration the slope safety factor of boundary ore has reduced to 1.453, which still is the first-class slopes. The engineering practice has proved that the boundary ores had been explored and filled by the time of May, 2011. The slope project stability turns to be sound, and there is no sign of such disasters as landslide, collapse or subsidence until now.

Key words: underground mining disturbance, high and steep slope stability, discrete element method PFC2D, finite-element approach FLAC3D, statics/dynamics analysis