Abstract: The upward horizontal slice filling method with point pillars is used as the main mining method above -692 m level in Xiadian Gold Mine,during the stoping process,the width of chamber is 6 m,and the with of pillar is 2 m,the pillar with the with of 2 m do not be recovered,which caused a serious loss of ore.The optimization of the mining method used in the mining area below -692 m level is conducted,the upward horizontal slicing filling method is proposed.Based on FLAC^3D numerical simulation software,the structural parameters of mining area are simulated,the optimal width of chamber and pillar are determined by analyzing the variation characteristics of plastic zone and stress of different simulation schemes corresponding with of chamber and pillar designed in this paper.The study results show that when the with of pillar is 4 m,the plastic deformation degree of the rock mass in pillar is low,the pillar integrity and security are both good;when the with of chamber is 5 m,the plastic zone area is smallest,and the plastic deformation is weakest.Therefore,the optimal width of pillar and chamber are 4 m and 5 m.

Key words: Upward horizontal slicing filling Method, Structural parameter optimization, FLAC3D, Numerical simulation