露天边坡稳定性影响因素分析及防治措施

Influencing Factor Analysis and Control of Open Pit Slope Stability

陡帮开采条件下,露天边坡的稳定对生产的持续性及高效性影响重大。综合考虑锦丰露天金矿受岩体结构面控制的平面破坏、楔形破坏、倾倒破坏、圆弧形破坏、土质边坡破坏5种失稳类型,以及地表地下水、开挖爆破的影响,分别提出长锚索+喷锚网支护、长锚索+钢网(局部区域喷锚网)支护、长锚索+喷锚网+抗滑桩支护、长锚索+钢带支护、HDPE防渗膜等支护手段,地表截(排)水沟及仰斜泄水泄压孔等疏水措施,及逐孔起爆修边爆破的爆破控制方案,有效保证了陡帮开采条件下的露天边坡稳定性。同时结合矿山多年实践经验,阐述了各种边坡加固方法的实际应用效果。

Under steep slope mining, the slope stability of open pit greatly affects the continuity and efficiency of production. Through fully considering 5 failure types of planar, wedge, toppling, circular and loose soil slope and its effect on surface water, groundwater and excavation blasting in Jinfeng Gold Mine, various reinforcement methods were proposed as follows： long cable bolt ＋ spray anchor net, long cable bolt ＋ steel mesh, long cable bolt ＋ spray anchor net ＋ anti - slide pile, long cable bolt ＋ steel mesh stripe and HDPE membrane. Some drainage measures as surface ditches and upward - inclined dewatering! depressurization holes and the hole - by - hole blasting with trim shot controlled method effectively guaranteed the slope stability of open pit under steep slope mining. Meanwhile, the practical effects of these reinforcement methods were elaborated combining with years of engineering practice.