海下开采断层活化监测与稳定性分析

针对海底大型金属矿山三山岛金矿新立矿区西南翼矿体上盘赋存F1断层在高强度开采下受到不同程度扰动而存在活化失稳可能性的问题,以弹性力学和最小势能原理为基础,推导出了加锚断层面活化的力学模型。采用MGJY锚杆截面应力计和单点位移计对断层应力、位移变化情况进行监测,结合实测数据,综合判断断层的稳定性,结果表明监测点处断层未发生活化。研究成果可为该区域其他断层的稳定性评价和后续治理提供理论依据及技术指导。

Monitoring and Stability Analysis of Fault Activation in Undersea Orebody Mining

There are F1 faults in the upper wall of the ore body in the southwest wing of Xinli mining zone of Sanshandao Gold Mine, a large-scale undersea metal mine. And the faults are disturbed to varying degrees due to high-intensity mining activities, which may lead to local activation and instability problems. Based on the principle of elastic mechanics and minimum potential energy, a mechanical model for activation of the anchored fault plane was derived. MGJY stress meter for cross-sectional area of bolt and single point extensometer were used to monitor the variations in the fault stress and displacement. Combined with the measured data, the stability of the fault was comprehensively analyzed. The results showed that the fault at the monitoring point was not activated. This research results can provide theoretical basis and technical reference for the stability evaluation and subsequent treatment of other fault fracture zones in this region.