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.

该研究项目将着重于促进对地震触发的坡度故障机制的基本理解，并有助于预测，减少和减轻其破坏性后果。地震触发的斜坡故障导致地震活跃地区的巨大经济和生命损失。但是，解决共同斜坡失败的触发和跳动的最新程序是高度理想化的，并且不纳入经受循环载荷的土壤行为的复杂性。这项研究将开发一个经过验证的数值框架，以分析从地面震动和失败开始到失败过程的整体故障过程。该数值工具将适应大型变形和水力机械耦合，并将与现有基于连续性的本构型模型兼容，以模拟液化触发和环状迁移率。开发的数值工具和教程手册将通过开源平台共享。这项研究还将得到外展活动的补充，包括研究生的讲座和从业者的培训课程。这项研究的结果可以更全面地了解与地震危害相关的风险。这项研究的目的是更好地捕获和了解地面运动特征，孔隙压力演化和坡度故障的最终移动性之间的联系。因此，该项目的研究目标包括：（i）建立和验证一个通用的数值框架，能够模拟地震载荷，现场响应和复杂位点的大变形，所有这些框架都在统一的计算框架内；（ii）在整个不稳定性过程中量化孔隙水压的演化；（iii）将接地运动的强度与失败的启动，失败行为和水力机械响应相关联。为了实现这些目标，将进一步开发现有的物质点方法框架，以准确模拟地面摇动，现场响应和大变形。在同一框架中将考虑核算材料阻尼和环状迁移率的最新构成模型，并将评估其性能。这些发展将使用离心测试和现场案例研究中的现有数据进行验证。该项目将允许PI告知，提高和改变对共同斜率稳定性分析的方式，尤其是对于复杂的几何形状，以及当关键基础设施处于危险之中时。这项奖项反映了NSF的法定任务，并认为通过使用该基金会的知识分子和更广泛的影响来评估Criteria的评估，并被视为值得通过评估的支持。