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Advances on the Failure Analysis of the Dam—Foundation Interface of Concrete Dams

机译:混凝土坝坝基界面破坏分析研究进展

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摘要

Failure analysis of the dam-foundation interface in concrete dams is characterized by complexity, uncertainties on models and parameters, and a strong non-linear softening behavior. In practice, these uncertainties are dealt with a well-structured mixture of experience, best practices and prudent, conservative design approaches based on the safety factor concept. Yet, a sound, deep knowledge of some aspects of this failure mode remain unveiled, as they have been offset in practical applications by the use of this conservative approach. In this paper we show a strategy to analyse this failure mode under a reliability-based approach. The proposed methodology of analysis integrates epistemic uncertainty on spatial variability of strength parameters and data from dam monitoring. The purpose is to produce meaningful and useful information regarding the probability of occurrence of this failure mode that can be incorporated in risk-informed dam safety reviews. In addition, relationships between probability of failure and factors of safety are obtained. This research is supported by a more than a decade of intensive professional practice on real world cases and its final purpose is to bring some clarity, guidance and to contribute to the improvement of current knowledge and best practices on such an important dam safety concern.
机译:混凝土大坝基础坝界面的破坏分析具有复杂性,模型和参数不确定性以及强烈的非线性软化特性。在实践中,这些不确定性通过经验,最佳实践以及基于安全系数概念的审慎,保守的设计方法的结构化混合来处理。但是,对于这种故障模式的某些方面,他们仍然拥有丰富而深入的知识,因为在实际应用中,使用这种保守方法已将其抵消了。在本文中,我们展示了一种基于可靠性的方法来分析此故障模式的策略。拟议的分析方法综合了关于强度参数和大坝监测数据空间变异性的认识不确定性。目的是生成有关此故障模式发生概率的有意义且有用的信息,这些信息可以纳入风险告知的大坝安全审查中。另外,获得故障概率与安全因素之间的关系。这项研究得到了十多年针对现实世界案例的深入专业实践的支持,其最终目的是提供一些清晰性,指导性意见,并有助于改善有关这一重要大坝安全问题的当前知识和最佳实践。

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