大柳行金矿床节理裂隙调查与岩体质量评价

Investigation into the joint fissures and evaluation of rock mass quality in Daliuhang Gold Deposit

在现场对大柳行金矿奄口矿区进行了节理裂隙调查统计工作,采用Mathematica软件对调查区域内660条节理裂隙测量数据进行分析并绘制相应的裂隙等密图、倾向和走向玫瑰图及倾角直方图。经分析研究后得出如下结论:矿区矿体较为破碎,下盘围岩完整程度低于上盘围岩;各中段节理裂隙分布密度均约为2~3条/m;节理裂隙总体上有越往深部越不发育,岩体完整性变好的趋势。对矿区具有代表性的矿岩现场取样并进行物理力学试验,依据RMR岩体质量评价方法,得出上盘围岩RMR评分值68.3,岩体质量等级为Ⅱ级,为良好性岩体;下盘围岩RMR评分值65.7,岩体质量等级为Ⅱ级,也为良好性岩体;矿体RMR评分值55.8,岩体质量等级为Ⅲ级,为一般性岩体。研究成果对保证矿体的安全、高效、经济回采具有重要指导意义。

Investigation into the joints fissure was conducted in the field of Ankou mining district of Daliuhang Gold Mine. Mathematica software was used to analyze the survey data of 660 joint fissures within the survey area and mapped the corresponding fissure iso-density diagram,inclination and tendency rose diagram and dip angle histogram.The conclusion is that the orebodies in the mining area are relatively fractured and the integrity of the footwall rocks is below that of the hanging walls; the joint fissure distribution density in each level averages 2-3 strips per meter; generally the integrity of rock mass becomes better with increasing depth while joint fissure development does otherwise.Representative rock mass was sampled in the field and tested by physical mechanics. The RMR rock mass quality evaluation method obtained the RMR score of the hanging wall to be 68.3 and the rock mass quality grade to be Grade Ⅱ,indicating a good rock mass; the RMR score of the footwall rocks is 65. 7 and the quality is Grade Ⅱ,also indicating a good rock mass; the RMR score of the orebody is 55. 8 and the quality is Grade Ⅲ,indicating a common rock mass.The study has guiding significance in ensuring safe,efficient and economic extraction of orebodies.