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SPOIL PILES - COMPARISON OF STABILITY ANALYSIS METHODS

机译：桩桩-稳定性分析方法的比较

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摘要

A study has been undertaken to confirm appropriate analysis methods applicable to design of granular waste materials and specifically that of "spoil piles" for open pit coal mining. The authors' experience with spoil pile stability is that the critical failure mechanism is a two wedge mechanism in accord with that highlighted in the literature. Analysis requires careful consideration of the combination of spoil shear strengths and the angle of the "rear" scarp adopted. Moreover, the literature indicates analyses need to take account of the inclined "inter-slice" within the mechanism. To highlight these considerations an example case was assessed utilising five limit equilibrium stability packages, two "numerical based" packages and a spreadsheet developed by the author. Several analyses are based on vertical slices to pose the question: what is the magnitude of error not using an inclined "inter-slice"? The results are presented as overall spoil pile angle indicated by the use of different software, stability method and assumptions on inclination of "rear" scarp and inter-slice. The example case highlights that, provided a rigorous stability method is utilised, for a given rear scarp assumption, the results of the analyses are insensitive to the software utilised. Therefore with appropriate judgement assessment of spoil pile stability should not be predicated by use of one particular software or stability method.
机译：已经进行了一项研究，以确认适用于颗粒状废料设计的适当分析方法，特别是适用于露天煤矿的“弃渣堆”设计方法。作者在弃土桩稳定性方面的经验是，临界破坏机制是与文献中所强调的一致的两个楔形机制。分析需要仔细考虑土抗剪强度和所采用的“后”陡角的角度的组合。此外，文献表明分析需要考虑机制内倾斜的“片段间”。为了突出这些考虑，使用五个极限平衡稳定性软件包，两个“基于数字的”软件包以及作者开发的电子表格对一个示例案例进行了评估。有几种分析是基于垂直切片提出的问题：不使用倾斜的“切片间”的误差幅度是多少？结果以整体弃土堆角表示，通过使用不同的软件，稳定性方法以及“后”斜纹和层间倾角的假设来指示。该示例案例着重指出，对于给定的后方翘曲假设，如果使用严格的稳定性方法，则分析结果对所使用的软件不敏感。因此，在没有适当判断的情况下，不应通过使用一种特定的软件或稳定性方法来评估弃土桩的稳定性。

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