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.

可持续性日益成为已建成基础设施建设和发展中的一个主要问题。系统地将环境影响和生命周期成本作为衡量标准纳入基于绩效的工程框架是这项研究的主要目标。地震区作为具有重大经济和环境影响的代表性岩土工程地区，为了发展这一框架的定量综合要素，重点关注了地基加固(加固)。来自加州大学圣地亚哥分校(UCSD)和中佛罗里达大学(UCF)的研究人员拥有互补的专业知识，正在合作开展这项工作。这项研究将开发和实施一个扩展的基于绩效的地基改良框架，纳入经济影响和碳足迹指标；通过使用案例记录和模型测试的数据进行校准和验证，提高与改良地基抗震性能相关的计算建模能力；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，将对所研究的地基改良技术的现有数据进行汇总和分析。在更好地了解地基的体积应变分布和沉降规律(包括地基荷载对液化后沉降的影响)的基础上，对现有的土体本构模型进行扩展，以更准确地模拟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。将制定一个严格的、以概率为基础、以业绩为基础的工程框架，综合考虑可持续性因素，并以数字方式加以实施，以便进行地基改善分析和设计。建筑信息建模(BIM)技术将用于将岩土数据、碳足迹和空间定居情景与地震后修复和可持续性指标相结合。从业者的直接意见将指导所有阶段，总体目标是推动地基改善分析和设计方面的最先进和最先进的实践。在此基础上，将对不同的地基改善方案进行评估，以推动决策支持进程。最后，基于这个扩展的PBEE可持续性框架的分析和设计工具将被开发用于有效的实际实施。在研究任务的同时，主要努力最大化对教育、外展和行业互动的影响。一个小型的行业咨询委员会将为研究项目提供指导，并创造现场和办公室暑期本科生实习机会。将为实习工程师提供教学研讨会，介绍本研究将要开发的工具的背景和使用情况。