考虑渗透系数变异性的堤防渗透破坏概率分析方法
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TV139.1

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国家重点研发计划(2017YF1502603);国家自然科学基金(51609069)


Probability Analysis Method for Seepage Failure of Embankment Considering Variability of Permeability Coefficient
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    摘要:

    堤防对我国人民生命财产安全有着重要的保护作用,目前针对堤防渗流破坏概率分析的研究有较多局限性,存在渗流破坏极限状态方程单一,无法考虑随机因素影响等不足。通过在有限元方法中将渗透系数视为随机变量的手段实现随机渗流分析,针对堤防渗流破坏可能发生的位置及其形式根据土体的受力情况构造渗流破坏极限状态方程,建立了堤防随机渗流计算有限元模型,对比分析了变异系数对堤防渗流场的影响,结合JC法理论进行可靠度分析,结果表明变异系数变大会使得水力梯度标准差增大及局部破坏概率增大。

    Abstract:

    Embankments play an important role in protecting people's lives and property in China. There are few studies on probability analysis of seepage failure of dyke. In this paper, The traditional method has the shortcoming of single limit state equation and can't consider the influence of many factors. This paper focuses on the possible position and form of seepage failure of dyke and construct the seepage failure function according to the force analysis of soil, Treating the permeability coefficient as a random variable in the finite element method to realize the stochastic analysis. Established a finite element model for stochastic seepage calculation of dyke. Analyzing the variation of mean and standard deviation of seepage field under different coefficients of variation,The increase of variation coefficient will increase the standard deviation of hydraulic gradient at the boundary. Taking a typical dyke as an example, analyzing the reliability with JC method, obtaining the probability of seepage failure in different regions of dyke.

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柯浩进,王&#; 媛,冯迪. 考虑渗透系数变异性的堤防渗透破坏概率分析方法[J]. 科学技术与工程, 2020, 20(7): 2858-2863.
Ke Haojin, Feng Di. Probability Analysis Method for Seepage Failure of Embankment Considering Variability of Permeability Coefficient[J]. Science Technology and Engineering,2020,20(7):2858-2863.

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历史
  • 收稿日期:2019-06-09
  • 最后修改日期:2019-10-29
  • 录用日期:2019-09-17
  • 在线发布日期: 2020-04-15
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