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首页> 外文期刊>Journal of geotechnical and geoenvironmental engineering >Accounting for Spatial Variability in Nonlinear Dynamic Analyses of Embankment Dams on Liquefiable Deposits
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Accounting for Spatial Variability in Nonlinear Dynamic Analyses of Embankment Dams on Liquefiable Deposits

机译：液体沉积物堤防坝非线性动态分析中的空间变异性

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摘要

Nonlinear dynamic analyses (NDAs) of embankment dams of different heights founded on a spatially variable, liquefiable alluvial layer are used to examine factors influencing embankment deformations and develop guidance on selecting representative properties for uniform analysis models. Simulations are presented for embankments ranging from 5 to 45 m high on stochastic and uniform alluvial layers subjected to a range of input motions, with sensitivity cases including the effects of various parameters describing the alluvium and embankments. Crest settlements and slope displacements obtained from the analyses with stochastic and uniform alluvial layers are compared to obtain equivalent uniform or representative percentile properties for which a uniform model produces the same deformation as a stochastic model. The representative percentile properties to estimate median deformations from a set of stochastic realizations are generally between the 40th and 60th percentile, whereas the representative percentile properties to estimate deformations conservatively (i.e., exceeded in less than 16% of the analysis cases) are generally closer to the 30th percentile. The variability in deformation patterns obtained with the stochastic models increases as the alluvium's scale of fluctuation in the horizontal direction increases relative to the embankment base width. Recommendations regarding factors to consider in selecting representative properties for spatially variable alluvial foundations in NDAs of embankment dams and the corresponding variability in deformations are presented.
机译：在空间变量上成立的不同高度的非线性动力学分析（NDAS），液化液化液层采用液化液化层，检查影响路堤变形的因素，并在为均匀分析模型选择代表性的制定指导。对于在经过一系列输入运动的随机和均匀的冲积层上的堤防，仿真范围为5至45米，具有灵敏度案例，包括各种参数描述血管和堤防的效果。将与具有随机和均匀的冲积层的分析获得的嵴沉降和斜率位移以获得均匀模型产生与随机模型相同变形的等效均匀或代表性百分位性能。从一组随机实现中估计中值变形的代表性百分位性质通常在第40和第60百分位之间，而代表性百分位性能保守（即，超过分析案例的不到16％的分析案例）通常更近30百分位数。随着随机模型获得的变形图案中的变形图案随着Alluvium在水平方向上的波动规模而相对于堤防基础宽度增加而增加。提出关于在堤防水坝NDA中选择空间可变的冲积基础的代表性的因素的建议以及变形的相应变化。

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