CLIMA/Collaborative Research: Landslide Triggering of Thermally Sensitive Slopes due to Climate Change

CLIMA/合作研究：气候变化引发热敏斜坡滑坡

• 批准号: 2332069
• 负责人: Emmanouil Veveakis
• 金额: $ 34.94万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-01-01 至 2026-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2332069&HistoricalAwards=false
• 关键词: CLIMA; Collaborative; Research; Landslide; Triggering

This CiviL Infrastructure research for climate change Mitigation and Adaptation (CLIMA) award supports research focused on understanding the risk of increased catastrophic landslides of historically stable or slowly creeping natural soil slopes due to the presence of soil materials that are thermally sensitive, i.e., they exhibit significant changes of strength and stiffness in response to a change of temperature. This is important in view of current and increased greenhouse gas emissions and the link to increases of the average planet temperature. Explaining, and hence predicting, the initiation, progression and size of landslides remains challenging for physicists, geologists and engineers. This project advances the science of when and how temperature changes could trigger these catastrophic, and potentially deadly, events. This research specifically targets the link between the observed behavior of small volumes of natural material at different temperatures and the stability of large natural soil slopes experiencing a temperature change. Building on this link, the scope to improve the resiliency of natural soil slopes to warming climates by reducing their thermal sensitivity using carbon nano fibers will be explored. Finally, the research will be further leveraged to produce undergraduate teaching materials to demonstrate how Civil Engineering research and practice can adapt to climatic changes. The research explores the multi-physics thermal soil response and link to catastrophic slope failures, distinguishing between the role of the soil’s micro and macroscopic properties versus a change to its state. The central hypothesis is that at higher temperatures thermomechanical softening is the dominant mechanism that triggers deep-seated slope movements in thermally sensitive slopes. A suite of thermal triaxial tests and centrifuge experiments on reduced scale slopes of thermally sensitive materials will bridge the existing gap between experimental observations of the thermomechanical behavior of soils at the element level and the observations of slope failures in the field. A specialized climate chamber within a geotechnical centrifuge will enable isothermal tests and controlled temperature increments to model climatic warming on a reduced scale model capturing the non-linear and stress dependent behavior of the full-scale slope. The results will enrich and validate predictive, thermally sensitive visco-plastic constitutive models. The combined datasets will ultimately allow the assessment of the relative importance of different deformation and failure mechanisms induced in a thermally sensitive soil slope. These will be further used to inform and test the effectiveness of targeting the material’s fabric at the microscale to increase the resiliency of thermally sensitive slopes to warming climates.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项用于缓解气候变化和适应性的民用基础设施研究（CLIMA）奖的研究旨在理解增加历史稳定或缓慢逐渐爬行的天然土壤槽的灾难性降落的风险，因为存在热敏感的土壤材料，即，它们揭示了对温度变化的强度变化和对温度变化的响应的显着变化和僵硬的变化。鉴于当前和增加的温室气体排放以及与平均行星温度升高的联系很重要。解释并预测，对物理学家，地质学家和工程师的倡议，进步和大小仍然受到挑战。该项目推进了何时以及如何变化可能触发这些灾难性且可能致命的事件的科学。这项研究专门针对不同温度下的小体积天然物质的观察到的行为与经历温度变化的大天然土壤槽的稳定性之间的联系。在此链接的基础上，将探索使用碳纳米纤维来降低其热敏感性来提高天然土壤槽对变暖气候的弹性。最后，这项研究将进一步杠杆作用，以生产本科教学材料，以证明土木工程研究和实践如何适应杂志的变化。该研究探讨了多物理的热土反应，并与灾难性的斜率失败联系在一起，从而区分了土壤的微观和宏观特性的作用，而不是其状态的变化。中心假设是，在较高温度下，热机械软化是主要机制，它触发热敏感插槽中深处的斜率运动。一套热三轴测试和对热敏感材料尺度插槽较小的离心机实验将弥合土壤在元素水平的热力学行为的实验观察与田间斜率故障的观察之间的现有差距。岩土离心机内的专门气候腔将实现等温测试和受控温度增量，以模拟降低的尺度模型上的杂交变暖，从而捕获全尺度斜率的非线性和压力依赖性行为。结果将丰富和验证预测性，热敏感的粘膜塑构模型。合并的数据集将最终允许评估在热敏感的土壤斜率中引起的不同变形和失效机制的相对重要性。这些将进一步用于告知和测试靶向微观材料的织物以提高热敏感插槽对变暖气候的弹性的有效性。该奖项反映了NSF的法定任务，并被认为是通过基金会的智力优点和更广泛的影响审查标准通过评估来评估的。