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基于熵权−TOPSIS法的超深竖井岩爆倾向性研究与应用

Research and application of rock burst proneness in ultra-deep shafts based on entropy weight−TOPSIS method

  • 摘要: 岩爆是深部岩体在高地应力条件下一种常见的灾害,对岩爆倾向性的判定是有效防治岩爆灾害的关键。以三山岛金矿工程项目为依托,开展超深竖井的岩爆倾向性研究。以钻孔岩芯试样为对象,开展了劈裂拉伸试验、单轴压缩试验和循环加卸载试验,基于岩性和围岩条件进行不同指标的岩爆倾向性评价,结果表明各评价指标存在明显差异。进一步开展了岩爆倾向性多指标综合研究,运用熵权−TOPSIS法进行岩爆倾向性综合评判。结果表明:600 m深度岩爆等级为中等岩爆,900 m、1 200 m和1 500 m深度均为强岩爆,预测结果总体上与凿井施工现场发生岩爆记录相符合。根据超深竖井面临的特殊条件,提出分区分序支护方案,构建主动锚固支护体系,从而调整释放围岩应力,减小岩爆危害程度。研究成果可为超深竖井围岩的岩爆预测和灾害预警与预防技术提供有益参考。

     

    Abstract: Rock burst is a common disaster in deep rock masses in high in-situ stress conditions, and the determination of rock burst proneness is the key to effective prevention and control of rock burst disasters. Based on the Sanshandao Gold Mine engineering project, a research was conducted on the rock burst proneness of ultra-deep shafts. Meanwhile, by taking drill core samples as the objects, split tensile tests, uniaxial compression tests, and cyclic loading and unloading tests were carried out. The evaluation of rock burst proneness based on different indicators of lithology and surrounding rock conditions shows significant differences in each indicator. Additionally, further comprehensive research was conducted on multiple indicators of rock burst proneness, and the entropy weight−TOPSIS method was adopted for comprehensive evaluation of rock burst proneness. The results indicate that the rock burst level at a depth of 600 m is moderate, while at depths of 900 m, 1200 m, and 1500 m, it is strong. The prediction results are generally consistent with the records of rock bursts occurring at the construction site. Based on the special conditions facing ultra-deep shafts, a zoning and sequential support scheme was proposed, and an active anchoring support system was constructed to adjust and release the stress of the surrounding rock and reduce the damage degree caused by rock burst. The research results can provide useful reference for rock burst prediction, disaster early warning, and prevention technology of the surrounding rock of ultra-deep shafts.

     

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