三山岛金矿西山深部北区矿岩质量分级及稳定性研究

Study on Quality Classification and Stability of Ore Rock in Deep North Area of Xishan in Sanshandao Gold Mine

为了保障三山岛西山深部矿体安全高效回采,对-1080~-1050 m水平矿岩的岩体质量进行调查研究。结果表明:节理裂隙表现为越往深部越发育的趋势,优势走向范围为30°~50°,270°~330°,优势倾向范围为100°~130°,60°~90°,300°~330°。基于RMR岩体质量分类法,结合岩体在工程尺度上的分级标准和开采作业等其他要素,构建西山深部矿区岩体质量分级与稳定性评价体系,计算出各中段水平岩体质量分级分布图。分级结果表明,大部分岩体为Ⅲ级岩体,小部分为稳定性较好的Ⅱ级岩体,极少部分为Ⅳ级岩体,基本无Ⅴ级岩体。随着开采深度不断加深,围岩等级种类越多,说明高应力对岩体的稳定性产生很大的威胁。对于高危岩体,应该采取支护或者局部卸压的方式来保障岩体的稳定性。

In order to ensure the safe and efficient mining of deep orebody in Xishan,Sanshandao,the rock mass quality of-1080~-1050 m level ore rock is investigated and studied.The results show that the joint fissures tend to develop deeper and deeper.The dominant strike ranges are 30°~50°and 270°~330°,and the dominant tendency ranges are 100°~130°,60°~90°and 300°~330°.Based on the RMR rock mass quality classification method,combined with the classification standard of rock mass on the engineering scale and other factors such as mining operation,the rock mass quality classification and stability evaluation system of Xishan deep mining area is constructed,and the horizontal rock mass quality classification distri⁃bution map of each middle section is calculated.The classification results show that most of the rock mass is Grade III rock mass,a small part is Grade II rock mass with good stability,a very small part is Grade IV rock mass,and there is basically no Grade V rock mass.With the deepening of mining depth,the more types of surrounding rock grades,indicating that high stress poses a great threat to the stability of rock mass.For high-risk rock mass,support or local pressure relief should be adopted to ensure the stability of rock mass.