Study on stope ground pressure control technology in Gongchangling underground mine

The ground pressure occurs violently in-280 m middle section of Gongchangling underground mine and high-strength metal arch supporting cannot prevent the destruction of ground pressure along with collapse and deformed rebar which seriously affected the normal production of mine.Field investigation shows roadway damage is divided into three kinds:structural plan tensile damage,structural plane shear failure and roof-fall damage.This paper analyzes two reasons for deformation of roadway:many cross faults exist in ore body with the decrease of the strength of the rock mass;chlorite schist develops with joint fissure and low intensity.This paper reveals that metal arch support is not suitable for complexity deformation of soft rock and discusses the development and practicality of bolt support.On this basis,this paper puts forward spray the anchor net supporting which is suitable for the damage of roadway and parameters.Practice shows that spray the anchor net supporting can commendably solve the problem of roadway damage to achieve the goal of controlling the ground pressure.