关键词: 无底柱分段崩落法, 边孔角, 离散单元法, PFC, 数值模拟

Abstract: With sublevel caving as the research object, the paper studied the laws in the ore drawing process with the changes of the lateral opening angle. Based on PFC2D, the movement of particles and the pressure field, especially lateral pressure of the funnel are all simulated and analyzed. As is shown, the lateral pressure rises with the increase of the angle of the lateral opening; the limit equilibrium cove forms and disintegrates much more frequently when the angel of lateral opening is lower.

Key words: Sublevel pillarless caving, Angle of the lateral opening, Discrete element method, PFC, Numeral simulation