Assessing Static Liquefaction Triggers in Tailings Dams Using the Critical State Constitutive Models CASM and NorSand

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Erick Rógenes, Ian Torras Paes, Bruno Guimarães Delgado, Rafael Jabur Bittar, Alessandra dos Santos Gomes, Alessandro Cirone, Alomir H. Fávero Neto, Leandro Lima Rasmussen
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引用次数: 0

Abstract

Static liquefaction-induced failure in tailings dams can result in extensive economic and environmental damage. In practice, the use of constitutive models capable of capturing this phenomenon and assessing structures susceptible to liquefaction is increasing. Numerous constitutive models exist and have been applied to model static liquefaction of tailings materials, but the extent of the influence exerted by the choice of constitutive model on analysis outcomes remains to be determined. This study addresses this uncertainty by employing the Clay and Sand Model (CASM) and NorSand models to analyze the well-documented case of the B1 dam failure in Brazil. Initially, a back analysis of the failure was conducted, and further analyses were carried out by simulating hypothetical triggers: crest loading and increased gravity. The influence of the adopted constitutive model on results was analyzed through the failure mechanisms generated, stress paths, and levels of disturbances necessary to trigger liquefaction. Both models produced compatible failure mechanisms, with slight differences observed in the level of disturbance required to trigger liquefaction. The results obtained from the B1 case indicate that the most important aspect related to the constitutive model in assessing structures susceptible to static liquefaction lies in the constitutive model's capacity to represent the sudden strength loss due to pore pressure generation, while the particular formulations employed in each method tend to be a secondary consideration in the analysis.

基于临界状态本构模型CASM和NorSand的尾矿坝静态液化触发因素评估
尾矿坝的静态液化破坏会造成广泛的经济和环境破坏。在实践中,能够捕捉这种现象并评估易液化结构的本构模型的使用正在增加。目前已有许多本构模型用于模拟尾矿材料的静态液化,但本构模型的选择对分析结果的影响程度仍有待确定。本研究通过采用粘土和沙子模型(CASM)和NorSand模型来分析巴西B1大坝溃坝的充分记录案例,解决了这一不确定性。最初,对破坏进行了反向分析,并通过模拟假设的触发因素(峰值载荷和重力增加)进行了进一步分析。通过产生的破坏机制、应力路径和触发液化所需的扰动水平,分析了所采用的本构模型对结果的影响。两种模型都产生了相容的失效机制,在触发液化所需的扰动水平上观察到轻微的差异。B1案例的结果表明,在评估易受静液化影响的结构时,与本构模型相关的最重要方面是本构模型表征孔隙压力产生引起的突然强度损失的能力,而每种方法中使用的特定公式在分析中往往是次要考虑因素。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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