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.

可持续性日益成为基础设施建设和发展的主要关注点。 将环境影响和生命周期成本系统地纳入基于性能的工程框架中作为指标是本研究的主要目标。 为了开发这种框架的定量综合要素，重点关注地震区的地面改良（稳定），作为具有重大经济和环境后果的代表性岩土工程领域。 来自加州大学圣地亚哥分校 (UCSD) 和中佛罗里达大学 (UCF) 的研究人员正在合作开展这项工作，他们具有互补的专业知识。 该研究将开发和实施一个基于绩效的扩展框架，用于地面改良，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，提高与改良地面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，适合决策考虑。 在进行这项研究时，将合并和分析有关所研究的地面改良技术的可用数据。 基于对改良地面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，现有的土壤本构模型将得到扩展，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。 将开发并以数字方式实施一个严格的基于概率性能的工程框架，该框架整体上包括可持续性考虑因素，用于地面改进分析和设计。 建筑信息模型（BIM）技术将用于将岩土数据、碳足迹和空间沉降场景与震后修复和可持续性指标相整合。 从业者的直接输入将指导所有阶段，总体目标是推进地面改进分析和设计的最先进和最实践。 在此基础上，将评估不同的地面改进方案，以实现决策支持过程。 最后，将开发基于扩展的 PBEE 可持续性框架的分析和设计工具，以实现高效的实际实施。在研究任务的同时，我们将主要努力最大限度地发挥对教育、推广和行业互动的影响。 一个小型行业咨询委员会将为研究计划提供指导，并创造现场和办公室暑期本科生实习机会。 将为执业工程师提供有关本研究中开发的工具的背景和使用的指导研讨会。