基于FLAC^(3D)的空区下矿体回采隔离保安矿柱厚度研究

Study on the Thickness of Isolated Pillar for the Mining Under the Goaf Based on FLAC^(3D)

以某地下矿山为工程背景,通过FLAC^(3D)数值建模,讨论不同隔离矿柱厚度下开采矿体对空区的影响,并将结果与现场监测数据进行了对比分析。研究结果表明:隔离矿柱的设置确实能够有效控制围岩变形和空区破坏,保证空区下矿体回采的安全进行;拉应力破坏是围岩破坏的主要形式;考虑到围岩自承能力以及矿量的损失,隔离矿柱厚度确定为15m左右。隔离保安矿柱的尺寸确定对类似矿山的空区治理及开采具有参考意义。

According to the background of an underground mine, using FLAC3D numerical modeling, the impact of mining with different thickness of isolation pillar on goaf was discussed. And the results were compared with the field monitoring data. The results showed that, setting isolated pillar can effectively control the deformation of surrounding rock and the damage of goaf, as well as ensure the safety of mining under the goal. Tensile stress was the main damage form of surrounding rock. Considering the bearing capacity of surrounding rock and ore loss, the thickness of isolated pillar should be determined for about 15 m. The determination of isolated pillar size had significant reference to goaf management and exploitation for similar mines.