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Slope stability case study by limit equilibrium and numerical methods.

机译：通过极限平衡和数值方法进行边坡稳定性案例研究。

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摘要

Stability analysis of slopes susceptible to different types of failures can be performed with different techniques. The selection of an appropriate technique is, therefore, a very important process of slope stability evaluation. In the assessment of slopes, the factor of safety values still remain the primary index for determining how close or how far slopes are from failure. Traditional limit-equilibrium (LEM) techniques are the most commonly-used analysis methods. Recently, however, the significant computing and memory resources typically available to geotechnical engineers, combined with low costs, have made the Finite Element Method (FEM) or Finite Difference Method (FDM) a viable additional method of analysis. The Shear Strength Reduction (SSR) technique enables FEM or FDM to calculate factors of safety of slopes.;In this study, five real case studies that used the Spencer's method, Morgenstern and Price's method, and finite difference method by SSR. The Spencer's and Morgenstern & Price's methods are limit equilibrium methods that satisfy all the static equilibrium condition. On the other hand, FEM or FDM methods are based on SSR. Slope stability of these five different cases was analyzed using LEM and FDM methods. GEOSTASE® software was used for analysis based on LEM, and FLAC® software was used for analysis based on FDM. Factors of safety (FS) values were calculated using both methods, and the results were compared for their applicability. Based on the comparison results, conclusions were drawn on the application of these methods. It was found that the results from these two methods are generally in good agreement. However, it was found in some cases that FDM analysis gave a factor of safety value that was less than the values determined by LEM. This is because the FDM considers more parameters and performs a detailed analysis of stress and strain conditions in the strata under consideration. Although the results may be different, the synergism of both methods can give valuable source of check on the slope failure mechanism.
机译：易受不同类型破坏影响的边坡的稳定性分析可以采用不同的技术来进行。因此，选择合适的技术是边坡稳定性评估的一个非常重要的过程。在对斜坡进行评估时，安全系数值仍然是确定斜坡距故障有多近或多远的主要指标。传统的极限平衡（LEM）技术是最常用的分析方法。但是，近来，岩土工程师通常可利用的大量计算和内存资源以及低成本使得有限元方法（FEM）或有限差分方法（FDM）成为可行的附加分析方法。剪切强度降低（SSR）技术使FEM或FDM可以计算边坡的安全系数。在本研究中，使用Spencer方法，Morgenstern和Price方法以及SSR的有限差分法的五个实际案例研究。 Spencer方法和Morgenstern＆Price方法是满足所有静态平衡条件的极限平衡方法。另一方面，FEM或FDM方法基于SSR。使用LEM和FDM方法分析了这五种不同情况的边坡稳定性。使用GEOSTASE®软件进行基于LEM的分析，使用FLAC®软件进行基于FDM的分析。使用这两种方法计算安全系数（FS）值，并比较结果的适用性。根据比较结果，对这些方法的应用得出了结论。发现这两种方法的结果总体上吻合良好。但是，发现在某些情况下，FDM分析给出的安全系数小于LEM确定的安全系数。这是因为FDM考虑了更多参数，并对所考虑的地层中的应力和应变条件进行了详细分析。尽管结果可能有所不同，但两种方法的协同作用可以为检查边坡破坏机理提供有价值的依据。

著录项

  • 作者

    Moudabel, Omar Ali M.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Geotechnology.;Engineering Civil.
  • 学位 M.S.
  • 年度 2013
  • 页码 78 p.
  • 总页数 78
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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