Abstract: According to the mining technical conditions of Asele copper mine,the Ansys software is adopted to calculate and analyze the stress and displacement change rule of the stope wall rocks with various spans of 10,12,13,15 m.The research results show that,stope span is the important factor which influences the stability of stope.Under the existing condition,if the stope span is above 13 m,it will be not remain stable,therefore,the optimal value of stope span is from 8 m to 12 m.

Key words: Numerical calculation, Optimization of stope structure, VCR mining method