Feasibility Study of High-Performance Cut-off Walls for Levees in Seismic Regions: Dynamic Wall Analyses and Ductile Slurry Development

地震区堤坝高性能防渗墙的可行性研究：动力墙分析和延性泥浆开发

• 批准号: 1030159
• 负责人: Adda Athanasopoulos-Zekkos
• 金额: $ 38.44万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1030159&HistoricalAwards=false
• 关键词: Feasibility; Study; Performance; Cut; off

The vast majority of U.S. river cities, now growing at increasing rates, are protected from flooding by earthen levees that are at risk from many sources of failure including seepage (both underseepage and through seepage), erosion and instability due to seismic loading. This grant provides funding to develop a novel type of slurry cut-off wall for levees that possesses multiple risk mitigation, including seepage resistance, high seismic resistance, constructability, and sustainable fabrication. The project aims at establishing the feasibility of such a cut-off wall through a combination of advanced materials design and non-linear dynamic numerical simulation of failure resistance against seismic loading. The cement and bentonite based material reinforced with nano/micro fibers will be designed using a micromechanics composite design methodology combined with numerical analyses of cut-off walls under seismic loading. To confirm the expected benefits, the project will include finite-element numerical analyses of levees and embankments with cut-off walls to understand the mechanical behavior of these slurry cut-off walls under seismic loading, as well as the soil-cut-off wall interaction. The results of this research will directly impact the design of vertical cut-off walls for levees in seismic regions, providing a safer, more efficient and sustainable alternative. The coupled material tailoring, mechanical and transport property testing, and soil-structure analyses represent a novel departure from past practice and provide an intellectual platform to attain significantly enhanced safety for U.S. river cities. This interdisciplinary project is expected to bring about new approaches to addressing the performance of broad geotechnical infrastructure systems beyond levees, including e.g. piles, below grade pipes and underground construction that have common features of soil/structure/materials interactions and are often subjected to large imposed deformation and water seepage.

绝大多数美国河流城市，现在以越来越快的速度增长，受到土堤的保护，这些土堤面临着许多失败的风险，包括渗流（地下渗流和通过渗流），侵蚀和地震荷载引起的不稳定性。该拨款为开发一种新型堤坝泥浆截渗墙提供资金，该墙具有多种风险缓解措施，包括抗渗透性、高抗震性、可施工性和可持续制造性。该项目的目的是通过先进材料设计和对地震荷载破坏抗力的非线性动态数值模拟相结合，确定这种截水墙的可行性。 将采用细观力学复合设计方法结合地震荷载下防渗墙的数值分析，设计纳米/微米纤维增强水泥和膨润土基材料。为了确认预期的效益，该项目将包括对带有防渗墙的堤坝和堤坝进行有限元数值分析，以了解这些泥浆防渗墙在地震荷载下的力学行为，以及土壤-防渗墙相互作用。该研究成果将直接影响地震区堤坝垂直防渗墙的设计，提供更安全，更有效和可持续的替代方案。耦合的材料剪裁，机械和运输性能测试，以及土壤结构分析代表了一种新的背离过去的做法，并提供了一个知识平台，以实现显着提高安全性的美国河流城市。这一跨学科项目预计将带来新的方法来解决堤坝以外的广泛的岩土基础设施系统的性能，包括例如桩，地下管道和地下建筑，具有土壤/结构/材料相互作用的共同特征，并且经常受到大的强制变形和渗水。