Study on the stope stability of Jilongshan gold mine under the condition of empty area around high stress and low grade

There are still a large number of ore bodies under the condition of empty area around high stress and low grade in Jilongshan gold mine have not been mined.In order to improve the utilization rate of mine resources and prolong the service life of the mine, the mining method and field test of these orebodies are carried out.Based on the physical properties of ore, the three-dimensional model of Jilongshan gold mine is established.By using finite difference element analysis software FLAC^3D, the distribution of original ground stress in test stope is simulated.The influence of the rectangular mining section, the elliptical mining section and the butterfly arch mining face on the stability of the stope are simulated and analyzed.The analysis results show that during the mining of ore body, no matter which horizontal mining section is adopted, there will be more stress on hanging and foot wall of the orebody and the pillar; the increment of stress and the distribution area of butterfly arch section are lower, which is beneficial to stope stability.The research results provide theoretical basis for the safety production in the field.