Sustainability and Performance-Based Ground Stabilization Assessment

可持续性和基于性能的地面稳定评估

• 批准号: 1201195
• 负责人: Ahmed Elgamal
• 金额: $ 34.11万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-15 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1201195&HistoricalAwards=false
• 关键词: Sustainability; Performance; Based; Ground; Stabilization

Sustainability is increasingly becoming a major concern in construction and development of the built infrastructure. Systematic inclusion of environmental impacts and life-cycle costs as metrics in performance-based engineering frameworks is a primary objective of this research. In order to develop the quantitative integrated elements of such a framework, attention is placed on ground improvement (stabilization) in seismic regions, as a representative geotechnical engineering area of major economic and environmental consequences. Researchers with complementary expertise from the University of California, San Diego (UCSD) and the University of Central Florida (UCF) are collaborating on this effort. The study will develop and implement for use an extended performance-based framework for ground improvement that incorporates economic impacts and carbon footprint metrics; advance the computational modeling capabilities related to the seismic performance of improved ground through calibration and verification using data from case histories and model testing; and report the probabilistic sustainability results in terms of risk/expense and carbon equivalent outcomes, suitable for decision-making considerations. In conducting this research, available data on the studied ground improvement techniques will be coalesced and analyzed. An existing soil constitutive model will be extended to more accurately capture post-liquefaction reconsolidation settlement behavior, based on a better understanding of the volumetric strain distribution and settlement patterns of the improved ground (including the influence of foundation loading on post-liquefaction settlement). The open source platform OpenSees will be employed for conducting the underlying Finite Element (FE) computations. A rigorous probabilistic performance-based engineering framework that integrally includes sustainability considerations will be developed and numerically implemented for ground improvement analysis and design. Building information modeling (BIM) techniques will be used to integrate geotechnical data, carbon-footprint, and spatial settlement scenarios with post-earthquake repair and sustainability metrics. Direct input from practitioners will guide all phases, with the overall goal of advancing the state-of-the-art and state-of-practice in ground improvement analysis and design. On this basis, different ground improvement options will be evaluated, towards the decision-support process. Finally, analysis and design tools based on this extended PBEE sustainability framework will be developed for efficient practical implementation.In parallel with the research tasks, a primary effort is made to maximize the impacts on education, outreach, and industry interaction. A small industry advisory board will provide guidance on the research program, and create field and office summer undergraduate student internship opportunities. Instructional seminars will be offered to practicing engineers on the background and use of the tools to be developed in this study.

可持续性日益成为建筑基础设施建设和发展的一个主要关切。 本研究的主要目标是系统地将环境影响和生命周期成本作为基于性能的工程框架中的指标。 为了开发这样一个框架的定量综合要素，注意力放在地震区的地基加固（稳定），作为一个代表性的岩土工程领域的主要经济和环境后果。 来自加州大学圣地亚哥分校（UCSD）和中央佛罗里达大学（UCF）的具有互补专业知识的研究人员正在合作开展这项工作。 该研究将制定和实施一个扩展的基于性能的地基改良框架，其中纳入经济影响和碳足迹指标;通过使用案例历史和模型测试数据进行校准和验证，提高与改良地基的抗震性能有关的计算建模能力;并报告风险/费用和碳当量结果方面的概率可持续性结果，以供决策考虑。 在进行这项研究时，将合并和分析所研究的地基加固技术的现有数据。 基于对改良地基的体积应变分布和沉降模式（包括地基荷载对液化后沉降的影响）的更好理解，将扩展现有的土壤本构模型，以更准确地捕捉液化后再固结沉降行为。 开源平台OpenSees将用于进行底层有限元（FE）计算。 一个严格的概率性能为基础的工程框架，整体包括可持续性的考虑将开发和数字实施的地基加固分析和设计。 建筑信息建模（BIM）技术将用于整合岩土工程数据，碳足迹和空间沉降方案与震后修复和可持续性指标。 从业人员的直接输入将指导所有阶段，总体目标是推进地基加固分析和设计的最新技术和实践水平。 在此基础上，将对不同的地基加固方案进行评估，以支持决策进程。 最后，基于此扩展PBEE可持续发展框架的分析和设计工具将被开发，以实现有效的实际实施。在研究任务的同时，主要努力最大限度地提高对教育，推广和行业互动的影响。 一个小型的行业咨询委员会将为研究项目提供指导，并为本科生创造实地和办公室暑期实习机会。 教学研讨会将提供给执业工程师的背景和使用的工具，在这项研究中开发。