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首页> 外文期刊>International journal of structural stability and dynamics >Seismic Stability Sensitivity and Uncertainty Analysis of a High Arch Dam-Foundation System
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Seismic Stability Sensitivity and Uncertainty Analysis of a High Arch Dam-Foundation System

机译：高拱坝基础系统的地震稳定性灵敏度及不确定性分析

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摘要

Parameter uncertainty associated with concrete arch dams always arises from modeling assumptions and the lack of knowledge or information of the engineering geological situations, especially in the seismic stability analysis of arch dams. In this research, a high arch dam is selected as a case study for probabilistic analysis of the seismic stability performance. The arch dam abutment and the dam are coupled as a system. A comprehensive approach considering contraction joints, boundaries of the probable sliding rock mass and the dam-foundation interface is presented. The contact nonlinearity is solved by using the dynamic contact model with Lagrange multiplier method. The main parameters of the probable sliding block are considered as random variables containing the friction coefficients and cohesions. Both the slippage and sliding area ratio are chosen as the engineering demand parameters (EDP). The sensitivity analysis is performed to reveal the relative influence of each parameter separately by the approximate incremental dynamic analysis (IDA) method. The friction coefficients are shown to be more crucial than the cohesions on the dam's resistance to seismic instability. The sliding area ratio can be better used for unveiling the sliding process of the arch dam of concern, while the slippage is useful for one to judging the stability of the arch dam under seismic hazards. The Latin hypercube sampling (LHS) with approximate moment estimation is used to investigate the parameter uncertainty to the seismic stability performance of the high arch dam. The results provide a useful reference for using the median/mean-parameter model to accurately estimate the median/mean response of the dam.
机译：与混凝土拱坝相关的参数不确定性始终是建模假设以及缺乏工程地质情况的知识或信息，特别是在拱坝的地震稳定性分析中。在这项研究中，选择了一个高拱坝作为对地震稳定性性能的概率分析的案例研究。拱门坝和大坝作为系统耦合。提出了一种综合方法，考虑收缩接头，可能的滑动岩体和坝上界面的界限。通过使用Lagrange乘法器方法使用动态接触模型来解决接触非线性。可能的滑块的主要参数被认为是包含摩擦系数和内聚力的随机变量。选择滑动和滑动面积比作为工程需求参数（EDP）。通过近似增量动态分析（IDA）方法，执行对敏感性分析来揭示每个参数的相对影响。摩擦系数被示出比大坝对地震不稳定的抗性的内聚更关键。滑动面积比可以更好地用于揭示拱坝的关注的滑动过程，而滑动对于判断拱坝在地震危险下的稳定性是有用的。具有近似时刻估计的拉丁超立方体采样（LHS）用于研究高拱坝地震稳定性性能的参数不确定性。结果为使用中位数/平均参数模型提供了有用的参考，以准确估计大坝的中位数/平均反应。

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