Abstract: In mining,the upward stratified backfill mining method is widely used.In the traditional upward stratified backfill mining method,each shift operator enters the stope to drill rock to drop the mine.The local stability of the stope roof is difficult to guarantee,and the large block rate is high.It requires secondary crushing,low work efficiency and high construction cost.In order to overcome the abovementioned problems,the layerbylayer extrusion and smooth blasting mining methods are adopted,and the layerbylayer extrusion smooth blasting technology is used to perform extrusion blasting and then the surface roof smooth blasting.This method has a small block rate and low blasting cost;layerbylayer smooth blasting,the roof of the stope is relatively flat,reduces disturbance to the surrounding rock,maintains stability of the surrounding rock,and workers are safer in the stope.

Key words: Upward stratification,Squeeze layer by layer,Smooth surface blasting