Study on the rules of ground pressure variation under the mining disturbance in iron mine

Based on the geological exploration in the mining area, the geological structure and rock structure were analyzed. The weak structures in 45m were specially studied. According to the structural analysis, we can obtain that the joint fissure is relatively concentrated, and it is easy to appear stress concentration at-45m level. In order to study the mining ground pressure, the borehole stress meters were used to monitoring the ground pressure at J₃ and J₄ excavating drift of 45m level. By the dynamic pressure monitoring method and the analysis on the monitoring data, the developed law of mining ground pressure in surrounding rock mass were obtained. Simultaneously, the monitoring results can provide some basis for safe and efficient mining.