崩落岩石侧压力作用下隔离矿柱宽度研究

Study on the Width of Isolated Pillar under the Lateral Pressure of Caving Rock

为确定在崩落岩石侧压力作用下隔离矿柱的宽度,采用FLAC3D模拟计算了5种不同宽度隔离矿柱的稳定性。结果表明:在侧压力作用下,隔离矿柱底部位置有明显的应力集中,空区侧的拉应力和水平位移明显大于二步骤矿柱;隔离矿柱的应力和水平位移随着宽度的增加而减小,确保隔离矿柱稳定的临界宽度为15 m。考虑受地质因素和爆破振动的影响,推荐矿山留设隔离矿柱宽度为20 m。

In order to determine the width of the isolated pillar under the lateral pressure of the cav ing rock,FLAC3D was used to simulate the stability of five different widths of isolated pillars.Under the ac tion of lateral pressure,there is obvious stress concentration at the bottom of the isolated pillar,and the ten sile stress and horizontal displacement on the side of the goaf are significantly greater than those of the two-step pillar.The stress and horizontal displacement of the isolated pillar decrease with the increase of the width,and the critical width to ensure the stability of the isolated pillar is 15 m.Considering the influence of geological factors and blasting vibration,it is recommended that the width of isolated pillar should be 20 m.