深部金矿岩爆倾向性分析与防控支护设计研究
Research on rockburst tendency analysis and control support design of deep gold mine
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摘要: 深部开采是矿山未来发展的必由之路。受深部高地应力环境影响,开采过程中存在岩爆的工程风险,尤其是深部硬岩金属矿山更为突出。针对深部金矿岩爆问题,以阜山金矿为工程背景,开展了现场地应力测试,进行了室内岩石加卸载试验,得到了不同位置岩体弹性变形能指数,分析了岩体岩爆倾向性,提出了不同岩体质量情况下的岩爆防控支护技术。研究结果表明:第一主应力与第三主应力方向接近水平,平均水平主应力与自重应力的比值在1.02~1.09之间,说明矿区的地应力场以水平构造应力为主导;岩体上盘及矿岩内部弹性变形能较低,不具有岩爆倾向性,下盘具有弱岩爆倾向性;对比全长树脂锚杆支护、树脂锚杆+能量吸收锚杆补强支护和单纯能量吸收锚杆支护下岩体抗爆安全系数的差异,针对不同围岩条件下的永久巷道和临时巷道提出了差异化的支护方案。Abstract: Deep mining is the only way for the future development of mines.Under the influence of deep high ground stress environment, there is engineering risk of rock burst during mining, especially in deep hard rock metal mines.Aiming at the rock burst problem of deep gold mine, the field stress test and indoor rock loading and unloading test are carried out with Fushan Gold Mine as the engineering background.The elastic deformation energy index of rock mass at different locations is obtained, the rock burst tendency of rock mass is analyzed, and the rock burst prevention and control support technology under different rock mass quality is proposed.The results show that the direction of the first principal stress and the third principal stress are close to the horizontal, and the ratio of the average horizontal principal stress to the dead weight stress is between 1.02 and 1.09, indicating that the ground stress field of the mining area is dominated by the horizontal tectonic stress.The upper wall of rock mass and the inner elastic deformation energy of rock mass are low, and there is non-rockburst tendency, while the lower wall has weak rockburst tendency.By comparing the difference of anti-explosion safety factor of rock mass under full-length resin bolt support, resin bolt + energy absorbing bolt reinforcement support and simple energy absorbing bolt support, differentiated support schemes are proposed for permanent roadway and temporary roadway under different surrounding rock conditions.