Soil and Foundation Improvement Solutions for Seismic Hazards

针对地震灾害的土壤和地基改良解决方案

• 批准号: 386019-2012
• 负责人: TofighRayhani, Mohammad
• 金额: $ 1.75万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572909
• 关键词: Soil; Foundation; Improvement; Solutions; Seismic

The upgraded seismic loading included in the revised national building code (NBCC 2005) postulates an increased seismic hazard in Canada. Most existing structures, including major infrastructure (e.g. nuclear power plants, bridges, etc.), were designed and constructed prior to these new design guidelines and are susceptible to earthquake damage. Thus there is a need to provide innovative solutions for earthquake resistant foundations for new and existing structures. This research program represents an effort towards resistant seismic design through developing innovative retrofitting techniques for foundations of existing structures as well as developing new techniques for constructing earthquake-resistant foundation systems. Previous earthquakes have clearly highlighted the role of local site conditions and soil-structure interaction (SSI) on earthquake damage. This research investigates the site response and SSI in urban areas and explores a soil improvement solution to mitigate the ground motion at the base of a structure. Considering the growing need for revision of hazard prevention measures for infrastructure facilities and disadvantages of available options, the proposed research also seeks to investigate two innovative techniques using geofoam and sheet piles to retrofit the foundations of existing infrastructures in order to protect them from earthquake damage. Foundation rocking during an earthquake contributes significantly to its response and may involve both uplift at one end and yield at the other. A composite mircopile foundation system, reinforced with fibre reinforced polymer, will be investigated using pile-load tests and numerical modelling for seismic resistant design. The research is expected to provide soil and foundation improvement techniques, efficient foundation systems and design guidelines for retrofitting of existing inadequate foundations as well as new seismic resistant foundations. These techniques are in high demand in the construction industry and transportation.

修订后的国家建筑法规（NBCC 2005）中包含的升级的地震负荷假设加拿大的地震危险增加了。在这些新的设计指南之前设计和建造了大多数现有的结构，包括主要的基础设施（例如核电站，桥梁等），并且容易受到地震损害的影响。因此，有必要为新的和现有结构的抗震基础提供创新的解决方案。该研究计划代表着通过为现有结构的基础开发创新的改造技术以及开发用于构建抗震抗震基础系统的新技术，这代表了抗拒地震设计的努力。 以前的地震显然强调了当地现场条件和土壤结构相互作用（SSI）对地震损害的作用。这项研究调查了城市地区的现场响应和SSI，并探索了一种土壤改善解决方案，以减轻结构底部的地面运动。考虑到对基础设施的危害预防措施的修订需求日益增长，拟议的研究还旨在研究使用地理剂和薄板堆进行研究的两种创新技术，以改造现有基础设施的基础，以保护它们免受地震损害。地震期间的基础摇摆对其反应做出了重大贡献，并且可能涉及一端的隆起，而另一端则屈服。将使用桩载测试和用于地震抗性设计的数值建模来研究一个用纤维增强聚合物加固的复合千边粉底系统。预计该研究将提供土壤和基础改进技术，有效的基础系统和设计指南，以改造现有基础不足以及新的地震抗性基础。这些技术在建筑行业和运输中需求很高。