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A Case Study of Safety Factor Comparison of Different Slope Stability Methods for Levee Design in New Orleans

机译:新奥尔良堤防设计中不同边坡稳定方法安全系数比较的案例研究

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Factors of safety are of the primary design criteria used in most slope stability analysis. Various analytical methods have been developed to assess factors of safety based on limit equilibrium theory, such as Janbu Simplified, Bishop Simplified and Spencer Methods. For decades, US Army Corps of Engineers, Mississippi Valley District (MVD), has been using a wedge-shape based approach called the Method of Planes. By analyzing one typical cross section in the New Orleans area, factors of safety calculated from different methods were compared assuming both circular and wedge-shaped failure surfaces. The calculations were performed utilizing commercial slope stability software SLOPE/W by GEO-SLOPE International Ltd. and program "Stability with Uplift" by US Army Corps of Engineers, MVD. It was found that for the same failure surfaces, Method of Planes tends to yield exactly the same factor of safety as Janbu Simplified Method when in cohesive soils using total stress strength parameters. In general, Method of Planes and Janbu Simplified Method usually have factors of safety lower than those calculated by Bishop Simplified and Spencer Methods for the same assumed failure surfaces. However, the actual difference significantly depends on the method's assumptions, soil properties and stratification, loading, geometry, pore water pressures, and methods of searching. This paper has limited these differences to major differences in soil properties and search mechanisms.
机译:安全因素是大多数边坡稳定性分析中使用的主要设计标准。已经基于极限平衡理论开发了各种分析方法来评估安全因素,例如Janbu Simplified,Bishop Simplified和Spencer方法。几十年来,密西西比河谷地区(MVD)的美国陆军工程兵团一直在使用一种基于楔形的方法,称为“飞机方法”。通过分析新奥尔良地区的一个典型横截面,比较了假定圆形和楔形破坏面的情况下通过不同方法计算出的安全系数。计算是使用GEO-SLOPE International Ltd.的商业边坡稳定性软件SLOPE / W和美国陆军工程兵团MVD的程序“ Uplift with Stability”进行的。结果发现,对于相同的破坏面,在使用总应力强度参数的粘性土壤中,“平面方法”往往会产生与“ Janbu简化方法”完全相同的安全系数。通常,对于相同的假定破坏面,平面方法和Janbu简化方法的安全系数通常低于Bishop简化和Spencer方法计算的安全系数。但是,实际差异在很大程度上取决于方法的假设,土壤性质和分层,载荷,几何形状,孔隙水压力以及搜索方法。本文将这些差异限制为土壤性质和搜索机制的主要差异。

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