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为了合理确定露天矿最终边坡角,在岩石力学试验和工程地质调查研究的基础上,分别应用三维弹性有限元程序ANSYS、三维弹塑性有限元程序PHASE2和三维黏弹塑性有限元程序EVP模拟最终边坡角为42°、50°、53°的开挖模式。建立计算模型时,最终台阶坡面角取65°;按照《矿山安全规程》,台阶高度12 m时,安全平台宽度取4 m,清扫平台宽度取6 m;台阶高度14m时,安全平台宽度取5 m,清扫平台宽度取8 m。结果表明,上帮最终边坡角不超过48°,下帮最终边坡角不超过50°,端帮最终边坡角不超过49°。较原有设计上帮可增大6°,下帮可增大8°～10°。
In order to reasonably determine the ultimate slope angle of open-pit mine, three-dimensional elastic finite element program ANSYS, three-dimensional elastic-plastic finite element program PHASE2 and three-dimensional viscoelasto-plastic finite element program EVP Slope angle of 42 °, 50 °, 53 ° excavation mode. When the calculation model is established, the final step slope angle is 65 °. When the height is 12 m, the safety platform width is taken as 4 m and the sweeping platform width is taken as 6 m according to Mine Safety Code. When the step height is 14m, the width of the safety platform 5 m, sweeping platform width take 8 m. The results show that the final slope angle of the upper gang does not exceed 48 °, the final slope angle of the lower gang does not exceed 50 ° and the final slope angle of the end gang does not exceed 49 °. Compared to the original design to help increase the 6 °, the next to help increase the 8 ° ~ 10 °.