变渗流条件下堤防稳定性的随机分析

Robert Lanzafame, Henry Teng, N. Sitar
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引用次数: 4

摘要

作者:Lanzafame, R;腾,H;Sitar, N |摘要:©ASCE。渗流对堤防稳定性的影响很大。具体而言,堤内的导水率分布影响着孔压分布,控制着土体的排水强度。在本研究中,在可靠性分析的背景下评估了导水率和毯层厚度对破坏概率的影响,可靠性分析还包括土强度和单位重量作为随机变量。采用一阶可靠度法(FORM)对随机变量进行可靠度评价,按重要度对随机变量进行排序,求得解对每个随机变量及其分布参数的灵敏度。稳定性计算采用Spencer的切片法与有限元渗流程序耦合,直接计算孔隙压力。此外,将响应面法解与直接可靠性解进行了比较,以评估响应面精度。结果表明,对于低渗层,毯层厚度的不确定性对安全系数的影响比大多数强度参数更重要,而导水系数的不确定性对安全系数的影响较小。讨论了实现有限元极限状态函数所带来的数值挑战。研究发现,当设计点位于响应面拟合点之间时,响应面法能较好地逼近直接可靠性解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stochastic Analysis of Levee Stability Subject to Variable Seepage Conditions
Author(s): Lanzafame, R; Teng, H; Sitar, N | Abstract: © ASCE. Levee stability is highly influenced by seepage. Specifically, hydraulic conductivity distribution within a levee influences pore pressure distribution and controls the drained strength of the soil. In this study the influence of hydraulic conductivity and blanket layer thickness on failure probability is evaluated within the context of reliability analyses that also include soil strength and unit weight as random variables. First-Order Reliability Method (FORM) is used to evaluate reliability, rank random variables by importance and to obtain sensitivity of the solution to each random variable and its distribution parameters. Stability is computed using Spencer's method of slices coupled to a finite element seepage code to directly evaluate pore pressure. In addition, response surface method solutions are compared to the direct reliability solution to assess response surface accuracy. The results show that blanket layer thickness is more important than most strength parameters and that the uncertainty in hydraulic conductivity is less important to the variance in safety factor for the case of a low-permeability blanket layer. Numerical challenges caused by implementing a finite element limit-state function are discussed. Response surface methods are found to give a reasonable approximation to the direct reliability solution when the design point is between response surface fitting points.
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