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.

这个CiviL气候变化减缓和适应基础设施研究（CLIMA）奖支持的研究重点是了解历史上稳定或缓慢蠕动的自然土壤边坡由于存在对热敏感的土壤材料而增加灾难性滑坡的风险，即，它们响应于温度的变化而表现出强度和刚度的显著变化。鉴于目前温室气体排放量的增加以及与地球平均温度上升的联系，这一点很重要。解释并预测滑坡的发生、发展和规模对于物理学家、地质学家和工程师来说仍然是一个挑战。该项目推进了温度变化何时以及如何引发这些灾难性和潜在致命事件的科学。这项研究专门针对在不同温度下观察到的少量天然材料的行为与经历温度变化的大型天然土质边坡的稳定性之间的联系。在此基础上，将探索通过使用碳纳米纤维降低其热敏感性来提高天然土壤斜坡对气候变暖的弹性的范围。最后，研究将进一步利用生产本科教材，以证明土木工程研究和实践如何适应气候变化。该研究探讨了多物理土壤热响应及其与灾难性斜坡破坏的联系，区分了土壤微观和宏观性质的作用与其状态变化的作用。中心假设是，在较高的温度下，热机械软化是主要的机制，触发深部的斜坡运动在热敏斜坡。一套热三轴试验和离心试验在缩小比例的热敏材料的斜坡将弥合现有的差距之间的实验观察的热-力学行为的土壤在元素水平和观察的斜坡破坏在现场。土工离心机内的专用气候室将实现等温测试和受控温度增量，以在缩小比例的模型上模拟气候变暖，捕获全尺寸边坡的非线性和应力相关行为。研究结果将丰富和验证预测性的热敏粘塑性本构模型。综合数据集将最终允许不同的变形和破坏机制的相对重要性的评估在一个热敏感的土壤边坡。这些将被进一步用于通知和测试的有效性，针对材料的织物在微观尺度上，以增加热敏感的斜坡，以适应气候变暖的弹性。这个奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。