基于不同地压监测尺度实现矿柱安全回采

单一的地压监测尺度已经不能满足矿柱回采过程中对不同尺度岩体安全监测的需求,针对该问题提出了"宏观与微观结合,整体与局部协同"的"最优化"原则,采用微震、应力、应变、位移等不同监测尺度的地压监测技术对某磷矿试验盘区矿柱回采过程中的地压活动进行监测,并指导矿山安全回采矿柱,取得了良好的效果。

Realization of ore pillar stoping safely based on different ground pressure monitoring scales

On the basis of summarizing existing anchoring theory research results, the mechanism about full grouted bolt and end-anchoring bolt was discussed in this paper. Then FLAC3D software was applied to establish the three-dimensional mechanical model of anchor bolt, and mechanical characteristics of the bolt was analyzed under different prestressing forces (0, 10 kN, 60kN), revealing that the stress distribution tended to concentrate in the front part of the bolt when prestressing force increased. In addition, relative displacement on the surface of the rock model under prestressing forces of 0 and 60 kN was presented. The analysis shows that the relative displacement is centered at the anchor point, within a range of 1 m. The maximum relative displacement peaks at the center and the relative displacement experiences a sharp decrease as the range increased. Finally, the conclusion is verified rationally by the on-site axial force measurement test.