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Probabilistic models for the erosion rate in embankments and reliability analysis of earth dams

机译:堤坝侵蚀率的概率模型与土坝可靠度分析。

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摘要

Probabilistic models for the concentrated leak erosion of earthen water retaining structures are presented. The models predict the values of the critical shear stress, the coefficient of erosion and the pipe radius enlargement, starting from other measurable soil properties and the geometrical dimensions of the embankment. The models account for both the non-cohesive and cohesive contributions to the erosion behavior. A Bayesian approach is used for the treatment of the unknown parameters. An importance sampling simulation is adopted to calibrate the models and estimate the posterior distribution of the unknown model parameters using laboratory and in situ experimental data. The new proposed probabilistic model for the pipe radius is then used to develop fragility curves that capture the pipe enlargement as a function of time for a given earth dam.
机译:提出了土工保水结构集中渗漏侵蚀的概率模型。这些模型从其他可测量的土壤特性和路堤的几何尺寸开始,预测临界剪应力,侵蚀系数和管道半径增大的值。这些模型说明了腐蚀行为的非内聚和内聚贡献。贝叶斯方法用于未知参数的处理。采用重要抽样模拟来校准模型,并使用实验室和现场实验数据估算未知模型参数的后验分布。然后使用新提出的管道半径概率模型来开发易碎性曲线,该曲线捕获给定土坝的管道随时间的变化。

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