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卡西阿露天矿上盘边坡高1000～1100呎,其中上部700呎由泥质板岩组成。本文即阐述此段边坡的稳定性分析和设计。分析表明,从可能取用的边坡角来看,深部破坏的可能性很小。然而,台阶上的楔形破坏却是稳定性的极重要因素。此种楔形破坏可能涉及整个台阶高度,也可能涉及其一部份。边坡稳定性分析及设计的基本依据是:按照台阶不稳定楔形破坏出现的概率来估计潜在楔形破坏的几何形状。概率论在边坡稳定性分析方面得以推广和应用,使之用来评价台阶失效的可能性,并把这种可能性与总体边坡设计联系起来。分析了不同宽度平台可能的楔形破坏概率,平台宽度是台阶几何形状、可能破坏体几何形状、总体边坡角及滑落材料安息角的函数。依此,矿山管理人员可以评价各种边坡设计方案并且自行决定,台阶破坏概率多大可为他们的特定采矿作业所接受。
Casia open-pit mine slope of 1000 to 1100 feet high, of which 700 feet above the top of the muddy slate composition. This article describes the stability analysis and design of this section of slope. Analysis shows that from the perspective of possible access to the slope, deep destruction is unlikely. However, wedging on the steps is an extremely important factor in stability. Such wedge-shaped damage may involve the entire step height, may also be part of it. The basic basis for slope stability analysis and design is to estimate the potential wedge geometry according to the probability of unstable wedge failure. Probability theory can be generalized and applied in slope stability analysis to evaluate the possibility of step failure and to link this possibility with the overall slope design. The possibility of wedge failure probability for different width platforms is analyzed. The width of the platform is a step geometry, which may destroy the geometry of the body, the overall slope angle and the angle at which the material slips. As a result, mine managers can evaluate various slope design options and decide for themselves how much step damage probability is acceptable to their particular mining operation.