某铀矿上下分区间保安矿柱破坏规律研究

对某铀矿上下分区间保安矿柱破坏规律进行了研究,采用FLAC3D进行数值模拟,确定12m为水平保安矿柱的安全厚度。同时对矿柱破坏引发的上盘岩体失稳演化过程进行了分析,由于矿体的开采,造成地应力二次分布,在开采区上盘形成卸压区和承压区,矿柱也发生从稳定阶段到变形阶段、破坏阶段的演化,与岩石的压破坏类似,水平保安矿柱的破坏机制符合岩石的破坏规律。

Study on Failure Rule of Security Pillars Between Partitions of a Uranium Mine

The failure law of security pillars between the upper and lower partitions of a uranium mine was studied,and FLAC 3D was used for numerical simulation to determine the safe thickness of a horizontal security pillar is 12 m.At the same time,the evolution of the upper rock mass caused by the destruction of the pillar was analyzed.Due to the mining of the ore body,the secondary stress was distributed.The evolution from the stable stage of the pillar to the deformation stage of the pillar and the destruction stage of the pillar occurs similar to the compressive failure of the rock.The failure mechanism of the horizontal security pillar conforms to the law of rock failure.