Laboratory investigation of screw micropiles as foundations in the Arctic

北极地区螺旋微型桩基础的实验室研究

• 批准号: 538566-2019
• 负责人: Deng, Lijun
• 金额: $ 1.82万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=680838
• 关键词: Laboratory; investigation; screw; micropiles; foundations

The infrastructure of Canada's Arctic regions is largely dependent on the performance of deep foundations. The traditional foundations used in the Arctic may pose several risks, such as the excessively large long-term settlement and the vulnerability of the foundations in warm permafrost during the summer. ARKK Engineering Corp., a consulting company located in Alberta, has a strong interest in re-designing foundations that are suitable for the Arctic. As a consultant, ARKK can choose the most appropriate foundation type for the Arctic. ARKK has chased several emerging foundation types in the past decades and suggest that the screw micropile may offer a viable solution to the foundations in the Arctic. However, before this emerging pile type could be practically used, the concerns with the long-term settlement and the engineering behaviour in warm permafrost should be addressed.ARKK and researcher at the University of Alberta therefore propose to investigate the performance of screw micropiles in the Arctic by conducting laboratory tests. The objectives of the proposed research are: 1) to investigate the long-term creep settlement of the pile; and 2) to study the efficiency of the pile as a ground freezing tool in warm permafrost during the summer. The proposed research will train two graduate students in geotechnical engineering. Findings of the project will significantly leverage ARKK's knowledge in cold regions foundation design and bring a well-engineered foundation type to Canada's Arctic.

加拿大北极地区的基础设施在很大程度上取决于深层地基的性能。北极地区使用的传统地基可能会带来若干风险，例如长期沉降过大，以及夏季在温暖的永久冻土中地基的脆弱性。ARKK工程公司，位于阿尔伯塔的一家咨询公司，对重新设计适合北极地区的地基有着浓厚的兴趣。作为顾问，ARKK可以为北极选择最合适的基础类型。在过去的几十年里，ARKK一直在研究几种新兴的基础类型，并认为螺旋微型桩可能为北极地区的基础提供可行的解决方案。然而，在这种新兴的桩类型可以实际使用之前，长期沉降和工程行为的关注，在温暖的永久冻土应解决。ARKK和研究人员在阿尔伯塔大学，因此建议进行实验室测试，以调查在北极的螺旋微型桩的性能。拟议研究的目标是：1）调查桩的长期蠕变沉降; 2）研究桩在夏季温暖永久冻土中作为地面冻结工具的效率。该研究将培养两名岩土工程专业的研究生。该项目的研究结果将大大利用ARKK在寒冷地区基础设计方面的知识，并为加拿大北极地区带来精心设计的基础类型。