Career: Geosynthetic-Reinforced Soil Structures Subject to Strong Earthquake Loading

职业：承受强地震荷载的土工合成材料加筋土壤结构

• 批准号: 0092739
• 负责人: Hoe Ling
• 金额: $ 37.5万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-03-01 至 2007-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0092739&HistoricalAwards=false
• 关键词: Career; Geosynthetic; Reinforced; Soil; Structures

This action is taken within the NSF Faculty Early Career Development (CAREER) Program, NSF 00-89, to support a research/education career project in the use of geosynthetic-reinforced soil structures to resist strong earthquake shaking. Geosynthetics provide a cost-effective solution in reinforced soil technology for many civil engineering structures. They have been applied widely as geosynthetic-reinforced soil retaining walls (GRS-RW), especially modular block GRS-RW that has gained wide popularity because of its pleasing esthetics. But structurally, these and other uses of geosynthetics serve a much more critical purpose in resisting seismic activity. While the performance of such geosynthetic-reinforced soils under routine (static) loads, and even minor earthquakes, has been good, recent experience indicates that improved knowledge and performance is needed regarding their response under strong earthquake shaking. In the 1999 Taiwan earthquake that produced large acceleration together with a large vertical component of that acceleration, several geosynthetic-reinforced soil structures collapsed. Clearly, available analysis and design procedures did not account for such severe dynamic loading. It is this shortcoming that is addressed in this research and education program.The project builds upon prior experimental and numerical research, and international cooperation with researchers in Japan undertaken by the PI. State-of-the-art shaking table facilities in Japan are used to test models under complex dynamic loading conditions, including vertical acceleration, in order to understand better the failure modes. The result is an improved characterization of the soil, the geosynthetic reinforcement, and their interaction. Additional parametric studies will result in a simplified procedure that enables GRS-RW to be designed based on permanent displacement.In addition to the technical value to the design community, this research program also provides a valuable tool for education. Two specific educational applications are addressed. First, the courses on geosynthetic waste containment and geotechnical earthquake engineering will use the results directly, as will the web based home page that already presents the PI's current research. In addition, a web based software package (Java Geotech) will be developed, and will join the currently active Geotech Forum for undergraduates. Second, this project, which involves applications in currently appealing areas of earthquake resistance and environmental remediation, will serve to encourage high school students, and especially minority students, to pursue studies relating to these areas. This will be accomplished through two Columbia University related programs to encourage interest in science and engineering among minorities: the Double Discovery Center and the Salvadori Education Center. Working through these Centers, teaching modules on reinforced soil structures and waste containment systems can be presented through lectures and laboratory demonstrations in high schools and through field trips, such as to JFK International Airport that is currently undergoing expansion, and to Columbia's Biosphere.

这一行动是在NSF教师早期职业发展（CAREER）计划（NSF 00-89）中采取的，以支持使用土工合成材料加固土壤结构来抵抗强烈地震震动的研究/教育职业项目。 土工合成材料为许多土木工程结构的加筋土技术提供了具有成本效益的解决方案。 它们作为土工合成材料加筋土挡土墙（GRS-RW）得到了广泛的应用，尤其是模块式砌块GRS-RW因其美观而受到广泛欢迎。 但是在结构上，土工合成材料的这些和其他用途在抵抗地震活动方面起到了更重要的作用。 虽然这种土工合成材料加固土壤在常规（静态）荷载甚至轻微地震下的性能良好，但最近的经验表明，需要改进有关其在强烈地震震动下的响应的知识和性能。 在1999年的台湾地震中，产生了大的加速度和大的垂直加速度分量，几个土工合成材料加固的土壤结构倒塌。 显然，现有的分析和设计程序没有考虑到如此严重的动态载荷。 该研究和教育计划正是针对这一缺陷而开展的。该项目建立在PI先前进行的实验和数值研究以及与日本研究人员进行的国际合作的基础上。 日本最先进的振动台设备用于在复杂的动态载荷条件下测试模型，包括垂直加速度，以更好地了解破坏模式。 其结果是改善了土壤、土工合成材料加固及其相互作用的特性。 额外的参数研究将导致一个简化的程序，使GRS-RW设计的基础上永久位移。除了技术价值的设计界，这项研究计划也提供了一个有价值的教育工具。 两个具体的教育应用程序解决。 首先，关于土工合成废物控制和岩土地震工程的课程将直接使用这些结果，同样，基于网络的主页也将直接使用这些结果，该主页已经展示了PI目前的研究。 此外，将开发一个基于网络的软件包（Java Geotech），并将加入目前活跃的大学生Geotech论坛。 第二，该项目涉及抗震和环境补救等目前有吸引力的领域的应用，将有助于鼓励高中学生，特别是少数民族学生，从事与这些领域有关的研究。 这将通过两个与哥伦比亚大学有关的方案来实现，以鼓励少数民族对科学和工程的兴趣：双重发现中心和萨尔瓦多教育中心。 通过这些中心的工作，可以通过在高中的讲座和实验室演示以及实地考察，例如到目前正在扩建的肯尼迪国际机场和哥伦比亚的生物圈进行实地考察，来介绍关于加固土壤结构和废物容纳系统的教学单元。