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辽宁某金矿矿柱回收过程地应力演化规律研究

Ground stress evolution during pillar recovery at gold mine in Liaoning Province

  • 摘要: 随着浅部资源的日渐枯竭,中国大量黄金矿山企业开始对浅部高品位资源进行残矿回收。残矿回收过程中,采场稳定性与地表沉降是安全回收的重要评价指标,因此需要对开采过程中地应力演化规律进行研究。依托辽宁某金矿浅部采场矿柱回收工程,采用Flac3D数值分析方法对顶柱回收进行了仿真计算,并对回收过程重点区域进行了地应力监测,获得了顶柱回收过程采场周边围岩地应力演化规律。数值模拟结果显示,采场顶柱回收过程会造成采场周边围岩位移增大0.3~0.5 cm,地应力向采场周边围岩集中,拉应力增大0.2~0.4 MPa,塑性区由剪切破坏向拉伸破坏扩展;地压监测数据显示顶柱回采扰动后围岩应力上升,为0.2~0.6 MPa,与数值模拟结果相符,验证了数值模拟的可靠性。由于地压调整的幅度不大并最终趋于稳定,对稳定性影响有限,可以判断该金矿在残矿回收过程中稳定性良好。研究结果表明,矿柱回收过程中利用地压监测与数值分析可以对采场围岩进行准确的稳定性评价,为现场施工提供了理论指导与安全保障。

     

    Abstract: As shallow mineral resources become increasingly depleted, many gold mining companies in China have begun recovering remnant ore from shallow, high-grade ore bodies. During this process, stope stability and surface subsidence are critical indicators in safety assessments, making it necessary to investigate how ground stress evolves during mining operations. This study was based on a pillar recovery project in shallow stopes at a gold mine in Liaoning Province. The top-pillar recovery process was simulated using FLAC3D, and ground stress was monitored in key areas during recovery. The results reveal how ground stress evolves in the rock surrounding the stope during top pillar recovery. The numerical simulation results indicate that top-pillar recovery increases the displacement of the surrounding rock by 0.3−0.5 cm, concentrates ground stress around the stope, increases tensile stress by 0.2−0.4 MPa, and expands the plastic zone, with the failure mode shifting from shear to tensile failure. Ground pressure monitoring data show that the stress in the surrounding rock increases by 0.2−0.6 MPa after the disturbance caused by top pillar extraction, which is consistent with the simulation results and validates the reliability of the numerical simulation. Given that the ground pressure adjustment is small and eventually stabilizes, its effect on overall stability is limited, indicating that the gold mine remains stable during remnant ore recovery. The results show that combining ground pressure monitoring with numerical analysis during pillar recovery enables an accurate assessment of the stability of the rock surrounding the stope and provides theoretical guidance and safety assurance for on-site operations.

     

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