Centrifuge modeling of axial behaviour of helical piles

螺旋桩轴向行为的离心机建模

• 批准号: 485776-2015
• 负责人: Deng, Lijun
• 金额: $ 2.33万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=649006
• 关键词: Centrifuge; modeling; axial; behaviour; helical

Helical pile foundations are widely used in the construction industry across Canada. A helical pile consists of a steel tubular shaft and one or more helices attached to the end of the shaft. Helical piles have many advantages such as large capacities, reusability, and rapid installation, compared to conventional straight-shaft piles; these advantages make helical piles especially suitable for the construction industry of Canada. In recent years, innovative helical pile types have been developed by pile manufacturers of Canada to meet the increasing demand of the industry. These piles often have large diameters and are subject to large static or cyclic loads. The design methodology of the piles has not been well established or validated by loading tests. In fact, it is nearly impossible to conduct in-situ loading tests for large-diameter piles due to the large pile capacities and the prohibitive cost of in-situ tests. Hence, a research program is necessitated for a comprehensive study of the in-situ performance of helical piles. **By partnering with Almita Piling Inc., Canada's manufacturer of helical piles, the research team at the University of Alberta will investigate the soil - helical pile interaction using geotechnical centrifuge model tests. Geotechnical centrifuge modeling is a laboratory test method for challenging geotechnical and structural problems. The proposed research will develop the technique and infrastructure for installing model helical piles on the centrifuge at the University of Alberta; the research will conduct loading tests of model helical piles installed in cohesive and cohesionless soils. The research will also conduct numerical modeling to calibrate the testing results. The outcome of the proposed research will benefit the industrial partner by providing a cost-effective and reliable laboratory testing method. The outcome will advance our understanding of the performance of helical piles and the soil - pile interaction. The research will benefit Canada's construction industry by providing a capable and economic foundation type.

螺旋桩基础广泛用于加拿大的建筑业。螺旋桩由钢管轴和一个或多个连接到轴末端的螺旋螺旋组成。与传统的直轴桩相比，螺旋桩具有许多优势，例如容量，可重复性和快速安装；这些优势使螺旋桩特别适合加拿大建筑业。近年来，加拿大的堆制造商开发了创新的螺旋堆类型，以满足该行业不断增长的需求。这些桩通常具有较大的直径，并且会承受较大的静态或循环载荷。桩的设计方法尚未通过加载测试来确定或验证。实际上，由于较大的桩容量和原位测试的过高成本，几乎不可能针对大直径桩进行原位装载测试。因此，必须对研究计划进行一项研究计划，以全面研究螺旋桩的原位性能。 **通过与加拿大螺旋桩制造商Almita Piling Inc.合作，艾伯塔大学的研究小组将使用岩土技术离心机模型测试研究土壤 - 螺旋桩的相互作用。岩土离心机建模是一种实验室测试方法，用于挑战岩土技术和结构问题。拟议的研究将开发用于在艾伯塔大学离心机上安装模型螺旋桩的技术和基础设施；这项研究将对安装在无内聚和内聚力土壤中的模型螺旋桩进行负载测试。该研究还将进行数值建模以校准测试结果。拟议研究的结果将通过提供具有成本效益且可靠的实验室测试方法来使工业合作伙伴受益。结果将提高我们对螺旋桩和土壤相互作用的性能的理解。这项研究将通过提供有能力的经济基础类型来使加拿大的建筑行业受益。