摘要
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。
Aimed at the serious condition of ground pressure disasters,such as rock burst and roof caving,appeared in Hongtoushan Copper Mine,acoustic emission（AE） monitoring technique was used to assess the rockmass stability during mining process in the deep stope,and the duration time of rock mass retraced to the stable state after blasting and the spatial distribution characteristics of AE signals were emphatically studied.The results show that AE activities suddenly jump to a higher level after the blasting,and decrease gradually with time going on.Additionally,a linear relationship is found between the duration time of rockmass retraced to stable state and the distance of monitoring area from blasting position.In the zone over 35 m from the blasting position,AE activity can be recoverd to stable state within 90 minutes after blasting,while in the zone within 20 m from the blasting area,the duration time of AE back to the initial background activity needs more than 2 hours.Moreover,AE events are mainly concentrated in the roof and side walls,and the spalling is more serious in the slope ramp.
出处
《采矿与安全工程学报》
EI
北大核心
2013年第2期243-250,共8页
Journal of Mining & Safety Engineering
基金
国家"十二五"科技支撑计划项目(2013BAB02B01
2013BAB02B03)
国家自然科学基金项目(51109035
51204030
51274055
51204031)
中央高校基本科研业务费专项资金项目(N110301006
N110501001)
关键词
深部采场
岩体稳定性
声发射
监测
deep stope
rockmass stability
acoustic emission
monitoring
