Abstract: In order to solve the problems of serious ore loss and poor stope stability in the point column upward horizontal
layered filling method,a new type of concrete filled steel tube pillar suitable for underground metal mine stope was developed.
Based on the engineering background of a stope in Hongbu mining area of Xincheng Gold Mine,the roof protection technology
and effect of concrete-filled steel tubular pillars are introduced. The results show that the new concrete-filled steel tube pillar
has the characteristics of " active support "," decompression and subsidence prevention "," blasting and collapse prevention
" and " collaborative control",which breaks through the limitation of the application of concrete-filled steel tube pillar in under-
ground metal mine stope. When the concrete-filled steel tube pillar roof protection technology is used to mine the ore body,
the plastic zone and the maximum displacement of the roof are controlled within a small range,which ensures the stability of the
stope. Compared with the method of supporting the overlying roof with point pillars,the roof protection technology of concretefilled
steel tubular pillars can realize the full recovery of ore in the stope under the premise of ensuring safe production,and has
significant economic benefits. The research results can provide new ideas for safe and efficient mining of ore bodies under similar
mining technology conditions.