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.

螺旋桩基础在加拿大各地的建筑业中得到了广泛的应用。螺旋桩由一个钢管桩和一个或多个连接到桩末端的螺旋组成。与传统的直桩相比，螺旋桩具有容量大、可重复使用、安装速度快等优点，这些优点使螺旋桩特别适合加拿大的建筑业。近年来，加拿大的桩基制造商开发了创新的螺旋桩类型，以满足行业日益增长的需求。这些桩往往直径较大，承受较大的静力或循环荷载。桩的设计方法还没有很好地建立起来，也没有通过载荷试验进行验证。事实上，大直径桩的现场载荷测试几乎是不可能的，因为桩的承载能力很大，而且现场测试的成本高昂。因此，需要一个研究程序来全面研究螺旋桩的现场工作性能。*通过与加拿大螺旋桩制造商Almita桩公司合作，阿尔伯塔大学的研究小组将使用土工离心机模型试验来研究土壤与螺旋桩的相互作用。土工离心机模型是一种用于解决岩土和结构问题的实验室测试方法。拟议的研究将开发在阿尔伯塔大学的离心机上安装螺旋桩模型的技术和基础设施；该研究将对安装在粘性和无粘性土壤中的螺旋桩模型进行载荷测试。研究还将进行数值模拟，以校准测试结果。拟议的研究结果将通过提供具有成本效益和可靠的实验室测试方法而使工业合作伙伴受益。研究结果将有助于我们对螺旋桩的工作性能和桩土相互作用的理解。这项研究将为加拿大的建筑业提供一个有能力和经济基础的类型。