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ANALYSIS AND DESIGN OF EMBANKMENT DAM SLOPES: A PROBABILISTIC APPROACH (SOIL MECHANICS, INDIANA).

机译:路堤大坝边坡的分析和设计:一种概率方法(土壤力学,印第安纳州)。

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摘要

The purpose of this research was to develop probabilistic procedures to improve present methods of analysis and design for embankment dams. Presently, the safety of an embankment slope is assessed by calculating a factor of safety which relates soil strength and loading conditions. Strengths are represented by single values chosen from scattered test results; both the "strengths" and the factor of safety are uncertain quantities.; In the proposed procedure, uncertainty was accommodated by treating strength as a random variable. Procedures were developed to characterize soil strength by a beta distribution fitted to three probabilistic moments. Strength variability for the Clarence Cannon Dam was estimated using a large number of tests obtained during embankment construction.; The use of a probabilistic design method necessitates the prediction of the expected mean and variance of embankment strength. Data from Cannon Dam was used to develop a recommended prediction procedure.; A review of existing probabilistic slope stability methods revealed several limitations regarding the general analysis and design of dam embankments: these relate to the ability to accommodate embankment zonation, loading conditions, possible failure surface shapes, and the shape of the strength probability distributions. An analysis procedure was developed that accommodates skewed strength distributions, the correlation between the (phi) and c strength parameters, multiple soils, and failure surfaces of a general shape. Results are expressed in terms of a "probability of failure" or reliability index.; Using the developed method, a series of parametric studies were performed for Cannon Dam to evaluate the relationship between probability of failure and loading conditions, parameter skewness, parameter correlation, reservoir level, and factor of safety. Different loading conditions having similar factors of safety were found to have greatly different probabilities of failure. The probability of failure was found to be strongly dependent on strength parameter correlation and somewhat dependent on parameter skewness. The method was also used to study Shelbyville Dam, where a slide had occurred, and to evaluate the increase in reliability due to its repair.; Recommendations are offered for the implementation of the proposed procedures in design practice.
机译:这项研究的目的是开发概率程序,以改善目前堤坝的分析和设计方法。目前,通过计算与土壤强度和荷载条件有关的安全系数来评估路堤边坡的安全性。强度由从分散的测试结果中选择的单个值表示; “强度”和安全因素都是不确定的数量。在提出的程序中,通过将强度视为随机变量来容纳不确定性。开发了通过拟合三个概率矩的beta分布来表征土壤强度的程序。克拉伦斯加农炮水坝的强度变异性是通过在路堤施工期间进行的大量测试估算得出的。概率设计方法的使用需要预测路堤强度的预期均值和方差。 Cannon大坝的数据被用于制定推荐的预测程序。对现有概率性边坡稳定性方法的回顾揭示了关于大坝路堤的一般分析和设计的一些局限性:这些局限性涉及适应路堤分区的能力,荷载条件,可能的破坏面形状以及强度概率分布的形状。开发了一种分析程序,可以适应偏斜的强度分布,(phi)和c强度参数之间的相关性,多种土壤以及大致形状的破坏面。结果以“故障概率”或可靠性指标表示。使用开发的方法,对Cannon大坝进行了一系列参数研究,以评估失效概率与载荷条件,参数偏斜度,参数相关性,水库水位和安全系数之间的关系。发现具有相似安全系数的不同装载条件具有极大不同的失效概率。发现失败的可能性很大程度上取决于强度参数的相关性,而在某种程度上取决于参数的偏度。该方法还用于研究发生滑坡的谢尔比维尔大坝,并评估由于修复而增加的可靠性。提供有关在设计实践中实施拟议程序的建议。

著录项

  • 作者

    WOLFF, THOMAS FRANCIS.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 274 p.
  • 总页数 274
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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