Abstract: The determination and optimization of stope structural parameters of gently inclined thick large orebody is of great significance to stope safety,economy and reliable mining. Taking an underground mine in Shandong Peninsula as the example,this paper calculates the stope geological parameters and mining parameters based on Mathew stability chart method,and determines the range of stope size parameters. Using FLAC3D numerical simulation software,the stope parameters are further analyzed,and the reasonable values of stope parameters are determined by integrating economic and technical factors. The study results show taht:① Based on the comprehensive consideration of the support capacity of surrounding rock,a reasonable stope width range of 28. 36~ 42. 17 m is given. ② Using FLAC3D numerical simulation software to simulate the stope,through the analysis of stress field and displacement field under the conditions of different width schemes,it is indicated that the 34 m width of the stope is the optimal scheme.

Key words: gently inclined thick orebody,structural parameters,Mathew stability chart,FLAC3D,ore pillar