甲玛铜多金属矿二期工程角岩、南坑边坡地处青藏高原，其特点为：海拔高、坡度大、相对高差大是矿区地形特征；矿区储量丰富，为世界级特大型多金属矿床；矿区位于甲玛—卡军果推覆构造系的前部带，地质构造复杂，岩性受该构造及热液侵入影响明显；设计露采边坡为高边坡。首先根据二期工程角岩、南坑的设计方案，结合露天采场最终境界的展布、边坡坡向、岩层产状要素特点及地质构造的基本情况，将角岩、南坑进行工程地质分区；采用钻孔摄像测试与定向孔钻探、声波测试、室内岩石力学试验等多种工程地质调查方法，应用符合国际惯例的工程地质编录技术对边坡体原有地质钻孔及补勘钻孔进行编录，进而评价与研究边坡体各分区的岩体结构面特征、岩体质量与岩体力学参数；采用极限平衡分析方法，分析了角岩与南坑边坡的稳定性，推荐了在多因素影响下边坡各工程地质分区的边坡角。研究结论可作为露天开采工程设计的参考依据。
Hornfels and south pit slope in Phase 2 project of Jiama Copper Polymetallic Mine are located in Ti-betan Plateau. Their characteristics are:high altitude, steep inclination, large relative elevation in terrain; huge re-serves,qualifying a world-class super large polymetallic deposit;the mining district is located in the front zone of Jia-ma—Kajunguo nappe tectonic belt with complex geological structures and the rock property is influenced by the struc-ture and hydrothermal fluids invasion;the designed open-pit mining slope is high slope. First,according to the design scheme of the Phase 2 project of the hornfels and south open pit, the engineering geological zoning was carried out based on the final distribution of open-pit boundary,slope dipping direction,occurrence features of stratum rock and basic status of the geologic structure;the engineering geological investigation methods included the borehole imaging test and directional hole drilling, acoustic testing, indoor rock mechanical testing. The engineering geologic logging technology in line with international practices was used for logging original geological drilling and exploration drilling of the slope. The slope structure features,rock quality and rock mechanics parameters for each zone of slope were eval-uated and studied; By the limit equilibrium method, the stability of hornfels and south pit slope was analyzed. The slope angle for each slope geological zone was recommended. The conclusion can be used as reference for the engineer-ing design of open-pit mining.
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