基于围岩应力监测和振动监测的采场稳定性研究  

Stope Stability Analysis Based on Monitoring of Surrounding Rock Stress and Vibration

作　　者：毛文杰 赵国彦[1] 王玺 陈立强 党成凯 MAO Wenjie;ZHAO Guoyan;WANG Xi;CHEN Liqiang;DANG Chengkai(School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China;Deep Mining Laboratory Subsidiary of Shandong Gold Mining Technology Co Ltd,Laizhou 261400,Shandong,China)

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]山东黄金矿业科技有限公司深井开采实验室分公司,山东莱州261400

出　　处：《矿冶工程》2023年第2期1-4,共4页Mining and Metallurgical Engineering

基　　金：国家重点研发计划项目(2018YFC0604606)。

摘　　要：采用自主设计的多功能监测杆对某金属矿采场开挖过程中的围岩稳定性进行实时监测,记录采场回采过程中监测杆长度范围内岩层垂直方向应力变化和围岩振动事件。结果表明,开挖面积增大会导致围岩所受应力和峰值速度呈现上升趋势,反映出围岩内部发生破裂次数增多,围岩稳定性下降,松动圈深度增加。对于采用集中端头锚固式锚杆进行支护的矿山,锚杆长度大于松动圈深度时,能更有效地控制松动圈演化和岩体冒落。该采场完成为期一个月的开采后,岩层沉降使监测杆长度范围内岩层垂直方向应力增加约3.9 MPa,振动事件强度满足我国爆破振动安全许可标准,综合评价围岩稳定性较好。A self⁃designed multi⁃functional rod was adopted to provide a real⁃time monitoring of surrounding rock stability during the excavation of a metal mine,and the variations of vertical stress of rock stratum and surrounding rock vibration occurrence within the monitoring range of the multi⁃functional rod during stoping were all recorded.It is found that the stress and peak ground velocity of the surrounding rock are all trending up as excavation area increases,which reflects that more fractures occur inside the surrounding rock,leading to lower degree of stability for the surrounding rock,and the excavation damage zone(EDZ)goes deeper.As for mines supported by top threaded anchor bolts,the EDZ evolution process and caving of rock mass can be more effectively controlled when the thread length of rod is greater than the depth of EDZ.After one month′s mining of this stope,it is found that the vertical stress of the rock stratum within the monitoring length of the multifunctional rod increases by 3.9 MPa due to the subsidence of the stratum,and the frequency of vibration occurrence meets the blast vibration standard for safety permit in China.It is shown that the surrounding rock has a good stability based on the comprehensive evaluation.

关 键 词：金属矿山 围岩 应力 地压监测 多功能监测杆 振动信号 松动圈 采场稳定性 

分 类 号：TD326[矿业工程—矿井建设]