RAPID/Collaborative Research: Subsurface Characterization of Liquefaction Case Histories from the 2023 Kahramanmaras Earthquake Sequence

快速/协作研究：2023 年卡赫拉曼马拉斯地震序列液化案例历史的地下特征

• 批准号: 2338025
• 负责人: Diane Moug
• 金额: $ 1.03万
• 依托单位: Portland 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: 2023-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2338025&HistoricalAwards=false
• 关键词: RAPID; Collaborative; Research; Subsurface; Characterization

This Grants for Rapid Response Research (RAPID) award will provide well-documented case histories on building and ground performance during earthquakes. The US has not experienced a large, widely-damaging earthquake for nearly 30 years. However, advancements can be made by understanding earthquake damage in countries with similar seismic risks and infrastructure, such as Turkey. The 2023 Kahramanmaras, Turkey earthquake sequence provides a unique opportunity to evaluate the effects of earthquake shaking on diverse infrastructure in varied geologic environments subjected to a wide range of shaking intensities. The post-earthquake observations enable the study of the effects of near-fault ground motions, liquefaction-induced infrastructure damage, and the cyclic behavior of silt and clay soils. Characterization of the ground at key sites allows to develop insights that are directly applicable to US cities such as San Francisco, Seattle, and Memphis. The work will proceed collaboratively with Turkish researchers to learn as much as possible from these earthquakes. The goal of the project is to benefit society through increased resiliency, sustainability, and affordability of civil infrastructure considering seismic impacts. The award will help train the next generation of US earthquake engineering leaders by supporting the interaction of a senior researcher with three early-career researchers from four institutions across the US, as well as the mentorship of a graduate student. This project focuses on obtaining subsurface data at key sites, which is essential to developing well-documented case histories of building and ground performance during earthquakes. The subsurface information will be collected primarily through seismic piezocone penetration tests to characterize the ground conditions, including shear wave velocity, and to detect critical soil layers. Additionally, exploratory soil borings will be performed to obtain samples for soil index testing. The subsurface data collected in this project will provide critical information to significantly expand the number of comprehensive case histories of liquefaction-infrastructure interactions, focusing on (1) infrastructure affected by ground shaking and ground failure in the near-fault region, (2) liquefaction-induced building damage, and (3) liquefaction of silts and clays. These three topics represent areas of earthquake engineering with knowledge gaps due to a dearth of case histories. Additionally, the subsurface data will provide insights regarding climate change and earthquake multi-hazards by contributing to evaluations of the frequent coastal flooding of Iskenderun, presumably due to liquefaction-induced ground movements.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.

这项快速反应研究补助金(RAPID)奖将提供关于地震期间建筑和地面性能的详细记录。近30年来，美国从未经历过一场破坏性极大的大地震。然而，通过了解具有类似地震风险和基础设施的国家(如土耳其)的地震破坏情况，可以取得进展。2023年土耳其Kahramanmaras地震序列提供了一个独特的机会，可以在不同的地质环境中评估地震震动对各种基础设施的影响，这些地质环境受到各种震动强度的影响。震后观测能够研究近断层地面运动、液化引起的基础设施破坏以及粉土和粘性土的循环特性的影响。对关键地点的地面进行表征，可以开发出直接适用于旧金山、西雅图和孟菲斯等美国城市的见解。这项工作将与土耳其研究人员合作进行，以尽可能多地从这些地震中了解情况。该项目的目标是通过提高考虑到地震影响的民用基础设施的弹性、可持续性和可负担性来造福社会。该奖项将通过支持一名高级研究员与来自全美四个机构的三名早期研究人员的互动，以及一名研究生的指导，帮助培养下一代美国地震工程领导人。该项目的重点是获取关键地点的地下数据，这对于开发记录良好的地震期间建筑物和地面性能的案例历史至关重要。地下信息将主要通过地震压电触探测试来收集，以表征地面条件，包括剪切波速，并检测关键土层。此外，还将进行探索性土壤钻探，以获取土壤指标测试的样本。该项目中收集的地下数据将提供关键信息，以显著扩大液化-基础设施相互作用的综合案例数量，重点是(1)近断层地区受地面震动和地面破坏影响的基础设施，(2)液化引起的建筑物破坏，以及(3)粉土和粘土的液化。这三个主题代表了地震工程领域，由于缺乏案例，知识空白。此外，地下数据将提供有关气候变化和地震多重危害的见解，有助于评估伊斯肯德伦频繁发生的沿海洪水，可能是由于液化引起的地面移动。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。