关键词: 点柱尺寸, 数值模拟, 地表变形

Abstract: With the continuous development of China's national economy，the demand for mineral resource is increasing.Some "three-under" resources that was not worth mining in the past are gradually listed to be mined.It is a focus in the study of mining industry in recent years that how to recycle those resources safely，efficiently，economically and ensure the safety of the related facilities on the surface.The panel overhand cut and filling mining method which is suitable for low value resources is put forward based on the mining technology condition of Cangshan Iron Mine.Groups of parameters including pointed pillar size and exposed area of roof are primarily selected by reference to the similar mining experience.Then，the numerical simulation is used to analyze and predict its influence on surface deformation.The results show that the scheme with pillar size 4m×4m and exposed area of roof 500 m2 is optimal，compared with other schemes.It improves the ore recovery by 3% ~ 5%.The simulation results show that the surface deformation value is less than the allowed under the recommended parameters.

Key words: Pointed pillar size, Numerical simulation, Surface deformation