Investigating the Effect of Pore Fluids on the Stability of Unsaturated Geomaterials

研究孔隙流体对非饱和岩土材料稳定性的影响

• 批准号: 1234031
• 负责人: Giuseppe Buscarnera
• 金额: $ 7.12万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1234031&HistoricalAwards=false
• 关键词: Investigating; Effect; Pore; Fluids; Stability

The key objective of this project is to investigate the stress-strain response of multiphase geomaterials and elucidate the mechanical implications of natural and/or artificial alterations in the state of the pore fluids. The multiphasic connotation of geomaterials makes their pore network a convenient setting for the physical interaction among constituents and plays a crucial role on how these materials deform and fail under stress. Rain infiltration, water table fluctuations and injection/extraction of fluids are only some examples of the remarkable interaction between geological materials and the interstitial fluids. There is therefore a pressing need for predictive theories explaining how changes in volume fractions and pore pressures can generate unexpected failures. The study will be based on the combination of advanced constitutive models for multiphase geomaterials and the mathematical theory of bifurcation. For this purpose, the predictive capabilities of modern modeling approaches will be discussed from a theoretical standpoint, with the goal of identifying the hydro-mechanical mechanisms that can originate failure in geotechnical materials.This research will contribute to an improved understanding of the mechanics of failure in geomaterials and has the potential to bridge the gap between the mechanical theories for multiphase media and the fundamental concept of material stability. These advances are important to extend to general saturation conditions a series of tools currently available only for fully saturated geomaterials and devise novel strategies for predicting the initiation of unstable mechanisms. The benefits of the research to society will be a better understanding of the mechanisms that govern the occurrence of geo-hazards, novel modeling tools for the design of geotechnical infrastructures and improved predictions of the consequences of multiphase flow across geological formations.

该项目的主要目标是研究多相地质材料的应力-应变响应，并阐明孔隙流体状态的自然和/或人工改变的力学含义。 岩土材料的多相性使其孔隙网络成为组分间物理相互作用的便利场所，并对这些材料在应力作用下如何变形和破坏起着至关重要的作用。 雨水渗透、地下水位波动和流体的注入/抽取只是地质物质与间隙流体之间显著相互作用的一些例子。 因此，迫切需要预测理论来解释体积分数和孔隙压力的变化如何产生意想不到的故障。 研究将基于多相岩土材料的先进本构模型和分叉的数学理论相结合。 为此，将从理论的角度讨论现代建模方法的预测能力，目的是确定水-该研究将有助于提高对岩土材料破坏机理的理解，并有可能弥合多相介质力学理论与岩土材料破坏基本概念之间的差距。材料稳定性 这些进展是重要的扩展到一般饱和条件下的一系列工具，目前只适用于完全饱和的地质材料和设计新的战略，用于预测不稳定机制的启动。 这项研究对社会的好处将是更好地了解地质灾害发生的机制，用于岩土基础设施设计的新型建模工具，以及改进对地质构造多相流后果的预测。