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针对红透山铜矿岩爆、采场冒落等地压灾害频发现状,采用声发射监测技术对深部采场开采过程中的围岩稳定性进行了研究,着重分析了爆破开采后岩体恢复至稳定状态的时间和声发射空间分布特征。研究结果表明:爆破开采后,声发射数目突增至较高水平,随着时间的推移,逐渐下降;岩体恢复至稳定状态的时间和爆破距离呈线性关系;对于距离爆破作业较远的围岩(超过35 m),声发射活动性在爆破后90 min内可以恢复较稳定状态;对于距离爆破作业较近的围岩(小于20 m),声发射数恢复到稳定状态超过2 h;声发射定位事件主要在采场顶板和边墙集中,斜坡道内片帮现象比较严重。
In view of the frequent occurrence of rock burst and stope collapse in Hongtoushan copper mine, acoustic stability monitoring of deep rock stope during mining process was studied by using acoustic emission monitoring technique. The rock masses after blasting mining Return to steady state time and acoustic emission spatial distribution characteristics. The results show that after blasting, the number of acoustic emission suddenly increases to a higher level, and gradually decreases with the passage of time. The time from rock mass restoration to a steady state shows a linear relationship with the blasting distance. For the distance from the blasting operation Rock (more than 35 m), the activity of acoustic emission can be restored to a stable state within 90 min after blasting. For the surrounding rock (less than 20 m) close to the blasting operation, the acoustic emission number has returned to steady state for more than 2 h. Launch positioning events are mainly concentrated in the stope roof and side walls, slash road slab more serious phenomenon.