缓倾斜
发布时间：2018-10-15 21:04
【摘要】：浅孔落矿爆破损伤直接影响到回采的损失贫化率和采场安全。采用ANSYS/LS-DYNA三维非线性动力有限元软件,研究矿山回采浅孔爆破落矿时炮眼沿矿体走向和垂直矿体走向布置的2种爆破方案。模拟研究浅孔落矿不同时刻围岩的有效应力云图和矿柱、顶板不同位置监测点的有效应力时程曲线,并引入爆破荷载下岩石Von Mises屈服准则,分析了顶板、矿柱的损伤范围和破坏范围。研究结果表明:在控制装药量和炮孔数量一定的情况下,当炮孔沿矿体走向方向布置时,爆炸动荷载对矿柱的损伤范围在距离矿房侧帮5 m,爆炸动荷载对矿柱的破坏范围在距离矿房侧帮2~3 m。当炮孔垂直矿体走向方向布置时,爆炸动荷载对矿柱的损伤范围在距离矿房侧帮4~5 m,爆炸动荷载不会对矿柱产生破坏作用;两种爆破方式对顶板的损伤范围在1~1.5 m,对顶板不会产生破坏作用。爆破数值模拟能在时间和空间上反映爆炸应力特征,为寻求最优的爆破施工方案提供了可靠的依据。
[Abstract]:The damage of shallow hole blasting directly affects the loss and dilution rate of mining and stope safety. In this paper, using ANSYS/LS-DYNA software, two blasting schemes are studied, in which the blasting holes are arranged along the strike of the orebody and the strike of the vertical orebody. The effective stress cloud diagram and pillar of surrounding rock at different time of shallow hole sinking and the effective stress time history curve of monitoring points at different position of roof are simulated and studied. The Von Mises yield criterion of rock under blasting load is introduced to analyze the roof. Damage range and damage range of pillar. The results show that under the condition of controlling the charge and the number of holes, when the holes are arranged along the direction of the orebody, The damage range of blast dynamic load to pillar is 5 m from the side of mine house, and the damage range of explosion dynamic load to pillar is 2 ~ 3 m from the side of mine house. When the hole is arranged perpendicular to the direction of the orebody, the damage range of the blasting dynamic load to the pillar is 4m from the side of the mine house, and the blasting dynamic load will not destroy the pillar. The damage range of the two blasting methods to the roof is 1 ~ 1. 5 m, and it will not damage the roof. Numerical simulation of blasting can reflect the characteristics of explosion stress in time and space, which provides a reliable basis for seeking the best blasting construction scheme.
【作者单位】： 武汉科技大学资源与环境工程学院;
【基金】：湖北省科技支撑计划(2014BCB033)
【分类号】：TD235.32
本文编号：2273829
[Abstract]:The damage of shallow hole blasting directly affects the loss and dilution rate of mining and stope safety. In this paper, using ANSYS/LS-DYNA software, two blasting schemes are studied, in which the blasting holes are arranged along the strike of the orebody and the strike of the vertical orebody. The effective stress cloud diagram and pillar of surrounding rock at different time of shallow hole sinking and the effective stress time history curve of monitoring points at different position of roof are simulated and studied. The Von Mises yield criterion of rock under blasting load is introduced to analyze the roof. Damage range and damage range of pillar. The results show that under the condition of controlling the charge and the number of holes, when the holes are arranged along the direction of the orebody, The damage range of blast dynamic load to pillar is 5 m from the side of mine house, and the damage range of explosion dynamic load to pillar is 2 ~ 3 m from the side of mine house. When the hole is arranged perpendicular to the direction of the orebody, the damage range of the blasting dynamic load to the pillar is 4m from the side of the mine house, and the blasting dynamic load will not destroy the pillar. The damage range of the two blasting methods to the roof is 1 ~ 1. 5 m, and it will not damage the roof. Numerical simulation of blasting can reflect the characteristics of explosion stress in time and space, which provides a reliable basis for seeking the best blasting construction scheme.
【作者单位】： 武汉科技大学资源与环境工程学院;
【基金】：湖北省科技支撑计划(2014BCB033)
【分类号】：TD235.32
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