Unified Multi-phase Numerical Framework for Understanding Co-Seismic Slope Failures in Complex Sites

用于理解复杂场地同震边坡破坏的统一多相数值框架

基本信息

批准号：
2211002
负责人：
Alba Yerro Colom
金额：
$ 31.01万
依托单位：
Virginia Polytechnic Institute and State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2023
资助国家：
美国
起止时间：
2023-01-01 至 2025-12-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2211002&HistoricalAwards=false
关键词：
Unified Multi phase Numerical Framework

项目摘要

This research project will focus on advancing the fundamental understanding of the mechanics of slope failures triggered by earthquakes and will help to predict, reduce, and mitigate their destructive consequences. Earthquake-triggered slope failures cause significant economic and life losses in seismically active regions. However, state-of-the-art procedures that address triggering and runout of co-seismic slope failures are highly idealized and do not incorporate the complexities of soil behavior subjected to cyclic loading. This research will develop a validated numerical framework to analyze the overall failure process, from the ground shaking and failure initiation to the post-failure processes. The numerical tool will accommodate large deformations and hydro-mechanical coupling and will be compatible with existing continuum-based constitutive models for the simulation of liquefaction triggering and cyclic mobility. The developed numerical tool and a tutorial manual will be shared through an open-source platform. The research will also be complemented by outreach activities, including lectures for graduate students and training sessions for practitioners. The outcomes of this research can be provide a more comprehensive understanding of the risk associated with earthquake hazards.The goal of this research is to better capture and understand the connection between ground motion characteristics, pore pressure evolution and final mobility of slope failures. Thus, the research objectives of this project include: (i) to establish and validate a generalized numerical framework capable of simulating earthquake loading, site response, and large deformations of complex sites, all within a unified computational framework; (ii) to quantify pore water pressure evolution during the entire instability process; and (iii) to correlate the intensity of the ground motions with the failure initiation, post-failure behavior, and hydro-mechanical response. To accomplish these objectives, the existing Material Point Method framework will be further developed to accurately simulate ground shaking, site response, and large deformations. State-of-practice constitutive models accounting for material damping and cyclic mobility will be considered in the same framework, and their performance will be evaluated. The developments will be validated using existing data from centrifuge testing and field case studies. This project will allow the PI to inform, advance, and transform the way co-seismic slope stability analyses are approached, especially for complex geometries and when critical infrastructure is at risk.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.

该研究项目将侧重于增进对地震引发的斜坡破坏力学的基本理解，并将有助于预测、减少和减轻其破坏性后果。地震引发的边坡破坏在地震活跃地区造成重大经济和生命损失。然而，解决同震边坡破坏的触发和跳动的最先进程序是高度理想化的，并且没有考虑到循环荷载作用下土壤行为的复杂性。这项研究将开发一个经过验证的数值框架来分析整个故障过程，从地面震动和故障开始到故障后过程。该数值工具将适应大变形和水力耦合，并将与现有的基于连续体的本构模型兼容，用于模拟液化触发和循环流动。开发的数值工具和教程手册将通过开源平台共享。该研究还将得到外展活动的补充，包括为研究生举办的讲座和为从业人员提供的培训课程。这项研究的成果可以提供对与地震灾害相关的风险的更全面的了解。这项研究的目标是更好地捕捉和理解地震动特征、孔隙压力演化和边坡失稳的最终流动性之间的联系。因此，该项目的研究目标包括：（i）建立并验证一个能够在统一的计算框架内模拟地震荷载、场地响应和复杂场地大变形的通用数值框架； (ii) 量化整个不稳定过程中的孔隙水压力演变； (iii) 将地面运动的强度与失效起始、失效后行为和流体力学响应相关联。为了实现这些目标，现有的质点方法框架将进一步发展，以准确模拟地面震动、场地响应和大变形。将在同一框架中考虑考虑材料阻尼和循环迁移率的实践本构模型，并评估其性能。这些进展将使用离心机测试和现场案例研究的现有数据进行验证。该项目将使 PI 能够告知、推进和改变同震边坡稳定性分析的方法，特别是对于复杂的几何形状和关键基础设施面临风险时。该奖项反映了 NSF 的法定使命，并被认为值得通过以下方式获得支持：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。