鲁中矿区破碎矿体开采地压测试及支护技术研究

STUDY OF GROUND PRESSURE TESTING AND SUPPORT TECHNIQUE IN MINING OF BROKEN ORE BODY IN LUZHONG MINES

鲁中矿区地质条件复杂,地下裂隙水发育,矿体破碎难以安全采出。采场地压表现为在自重应力作用下,顶板出现拉应力破坏,导致顶板冒落。针对这种情况,开展采场地压规律的动态监测。应用钻孔应变计测量采场地应力变化,采用电子数显式收敛计量测围岩变形,得出采场巷道地压变化的一般规律,为矿山今后选择合理的开采方案和地压控制措施提供科学依据。

Because of the complicated geological conditions,fragmentation of ore and rock mass,developed underground water,Luzhong iron mine is one of difficult excavation mine in China.According to the conditions of the very broken orebody in Luzhong mines,so they are difficult to be mined safely,the dynamic monitoring of the law of stope ground-pressure was carried out.The change of stope ground-pressure was measured by using the borehole strain sensor,and the electronic digitally-displayed convergence indicator was used to measure deformations of surrounding rock so as to obtain a general law of the ground pressure.This technique provides a scientific basis for selecting rational mining method and ground-pressure control measures.