A unified framework for engineering characterization of argillaceous formations (soils and rocks)

泥质地层（土壤和岩石）工程表征的统一框架

• 批准号: RGPIN-2015-06703
• 负责人: Wong, Ron
• 金额: $ 1.46万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=677058
• 关键词: unified; framework; engineering; characterization; argillaceous

Argillaceous formations are the most abundant sedimentary soil and rock types, varying according to different estimates from 45 to 55% of the total sedimentary formation column. The argillaceous formations containing silt- or clay-sized particles or clay minerals could be uncemented (stiff clays and hard clays) or hardened (shales, argillites, siltstones, and mudstones). Due to their abundance and variation in engineering properties, the argillaceous formations impose many challenges on the geotechnical community (e.g., foundation, slope stability, and underground excavation) and energy sector (e.g., well completion, reservoir containment, and hydraulic fracturing). ***    All these argillaceous formations are composite equivalents of clays, muds, and silts, with varying degree of consolidation or cementation (induration). Their engineering properties depend on constituent type, composition, size distribution, arrangement, and cementation. Most of previous research investigations on argillaceous formations are very site specific. Empirical correlations based on simple physical tests indices (such as clay content, liquid and plastic limits) have been made among argillaceous formations from different sites. These empirical correlations have no room for scientific development and limiting use in engineering practices. The long-term goal of this proposed research program is development of a unified framework for engineering characterization of argillaceous formations (soils and rocks). The framework will be built on understanding and quantifying the fundamental physics of the nano- and micro-structures of the argillaceous formations, and the interaction of the composite materials with the environmental changes encountered in practical applications. Advanced imaging and microscopy techniques will be used in characterizing the argillaceous formation structure in nano- and micro-levels. Innovative methodologies will be developed in laboratory to evaluate the behavior and performance of argillaceous formations under high temperature, pressure, stress and chemical gradient conditions in practical applications. The findings from this research program can be readily transferred to other research and practical activities listed above in terms of constitutive modelling, numerical simulation and design. **

泥质地层是最丰富的沉积土壤和岩石类型，根据不同的估计，占总沉积地层柱的 45% 至 55%。含有淤泥或粘土大小的颗粒或粘土矿物的泥质地层可能是非胶结的（硬质粘土和粘土）。硬质粘土）或硬化岩（页岩、泥岩、粉砂岩和泥岩）由于其丰富性和工程特性的变化，泥质地层给岩土工程领域（例如地基、边坡稳定性和地下开挖）和能源领域（例如完井、水库封堵和水力压裂）带来了许多挑战***    所有这些泥质地层都是粘土的复合等价物。 、泥浆和淤泥，具有不同程度的固结或胶结（硬结），其工程特性取决于成分类型、成分和尺寸。先前对泥质地层的大多数研究都是基于简单的物理测试指标（例如粘土含量、液体和塑性极限）对不同地点的泥质地层进行的经验相关性。经验相关性没有科学发展的空间，并且限制了在工程实践中的使用。该研究计划的长期目标是开发一个统一的泥质地层工程表征框架。该框架将建立在理解和量化泥质地层纳米和微观结构的基础物理基础上，以及复合材料与实际应用中遇到的环境变化的相互作用，用于表征泥质地层结构。将在实验室开发纳米和微米水平的创新方法，以评估泥质地层在高温、压力、应力和化学梯度条件下的行为和性能。实际应用 该研究项目的结果可以很容易地转移到上面列出的本构建模、数值模拟和设计方面的其他研究和实践活动中。