Sustainability and Performance-Based Ground Stabilization Assessment

可持续性日益成为建筑基础设施建设和发展的主要问题。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的度量是本研究的主要目标。为了开发这种框架的定量综合要素，将重点放在地震区的地面改善（稳定）上，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）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绩效的地面改善框架，其中包括经济影响和碳足迹指标；通过使用案例历史和模型测试的数据进行校准和验证，提高与改良地基地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，将对所研究的地面改善技术的现有数据进行合并和分析。在更好地理解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）的基础上，对现有的土本构模型进行扩展，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。将开发一个严格的基于概率性能的工程框架，其中包括可持续性考虑因素，并在数值上实施地面改善分析和设计。建筑信息模型（BIM）技术将用于将岩土技术数据、碳足迹和空间沉降情景与震后修复和可持续性指标相结合。从业员的直接意见将指导所有阶段，其总体目标是提高地面改善分析和设计的最新水平和实践水平。在此基础上，将对不同的地面改善方案进行评估，以实现决策支持过程。最后，将开发基于这一扩展的PBEE可持续性框架的分析和设计工具，以便有效地实施。在研究任务的同时，主要的努力是最大限度地提高对教育、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项目提供指导，并创造实地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，介绍本研究开发的工具的背景和使用。

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.