无底柱分段崩落法的地压控制

The Ground Pressure Control for Sublevel Caving

符山铁矿四矿体采用无底柱分段崩落法回采,近年来相继发生四次大面积地压活动。本文介绍了采用岩体声发射监测仪、收敛计等多种手段,探索地压显现规律。在此基础上,相应地采用斜线回采工作线,改善联巷受力条件等地压控制措施及适当的巷道支护方式,使矿山地压活动得到了控制,实现了有计划地连续性生产,采场矿石回采率达82%以上。

The sublevel caving method is used in No.4 ore body of Fusan Iron Mine, and large scale stratum movement took place there for four times in the past a few years. Many kinds of instruments, such as AE monitor, convergence meter, etc., are used to study the law of stratum pressure appearance. On this basis, oblique stoping lines and proper support system are adopted, so that the stratum movement is controlled, and continuous production of iron ore is realized with an extraction rate of eighty two per cent.