通过矿岩力学强度测试和工程地质调查对丰山铜矿北缘试验采场稳定性开展研究,重点分析矿岩质量评价结果和采场顶板水力半径计算结果.研究结果表明:RMR法和Q分类法对矿岩质量评价均为好;通过Mathews稳定性图表法计算得出,北缘矽卡岩的无支护安全跨度为9.19～11.49 m;大理岩的无支护安全跨度为9.45～11.81 m;花岗闪长斑岩的无支护安全跨度为11.40～18.00 m.
Stability study of trial stope on the northern margin of Fengshan Copper Mine
This study investigates the stability of trial stope on the northern margin of Fengshan Copper Mine through ore rock mechanics strength tests and engineering geological surveys.The focus is on analyzing rock mass quality assessment results and calculating the hydraulic radius of the stope roof.The research findings indicate:that rock mass quality is rated as good using both the RMR method and the Q classification method;according to the Mathews stability graph method,the unsupported safe span for skarn in the northern margin ranges from 9.19 m to 11.49 m;the unsupported safe span for granite ranges from 9.45 m to 11.81 m;the unsupported safe span for granodiorite porphyry ranges from 11.40 m to 18.00 m.
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