关键词: 深部破碎硬岩, 采动压力, 收敛监测, 峰值范围, 影响范围, 锚网喷浆联合支护

Abstract: In order to figure the mining pressure distribution law in deep crushed hard rock， and with Gongchangling iron mine as engineering background， mining convergence monitoring is made in three stopes with different depths. The monitoring results show that the mining pressure in Gongchangling shows a fluctuating trend with the maximum mining pressure appearing at about 8 m away from the boundary of the gob. The peak of mining pressure appears within 3 m above the hanging wall and 10 m below the foot wall. The influence scope of the pressure exceeds 11.5 m along the direction of the ore-body， and the concentrated mining pressure exists in the range of 8.5 to 11.5 m from the working face. The peak mining pressure is within 6.2 to 9.3 m to the boundary by auxiliary side-pressure monitoring， which verifies the maximum mining pressure appearing at about 8 m away from the boundary. On this basis， a bolt-net-grouting joint support scheme is proposed to solve the problem of mining pressure in deep underground and achieve expected supporting effect.

Key words: Deep broken hard rock, Mining pressure, Convergence monitoring, Peak value scope, Influence scope, Bolt-net-grouting joint support