Pore Pressure Response and Setup Behaviour of Helical Piles in Cohesive Soil

粘性土中螺旋桩的孔隙压力响应和安装行为

• 批准号: 521822-2017
• 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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=640550
• 关键词: Pore; Pressure; Response; Setup; Behaviour

A helical pile is an innovative deep foundation type that has numerous advantages over conventional piles. Asthese advantages are realized in the foundation industry, this pile type is becoming increasingly common acrossCanada. Helical piles are now a preferred foundation solution for structures such as: low-rise commercial andresidential buildings, power transmission towers, and modular buildings.It is widely accepted that the soil disturbance caused by helical pile installation is less than that ofconventional piles; however little research has been conducted to quantify this difference or to determine itseffect on pile capacity. Due to this research gap, the short-term capacity reduction caused by installationdisturbance is difficult to predict and is often neglected. These deficiencies may lead to improper capacityestimations and under-design.Located in Leduc, Alberta, Twist Development Inc. (Twist) is a manufacturer of helical piles. It is importantto Twist, and the helical pile industry as a whole, that the understanding of helical pile installation effects isfurther investigated. The overall objective of the proposed research is to quantify the installation induced porepressure generation and its effect on the short-term capacity of helical piles. This research will lead to moreaccurate designs and greater confidence in this pile type across the foundation community.

螺旋桩是一种创新的深基础类型，与传统桩相比具有许多优点。随着这些优势在基础行业中得到实现，这种桩型在加拿大变得越来越普遍。螺旋桩是低层商住楼、输电塔、模块化建筑等建筑物的首选地基处理方案。人们普遍认为，螺旋桩安装引起的土体扰动比常规桩小，但很少有人研究这种差异或确定其对桩承载力的影响。由于这一研究空白，安装扰动引起的短期容量降低是难以预测的，而且往往被忽视。这些缺陷可能导致不正确的容量估计和设计不足。位于艾伯塔省勒杜克的Twist开发公司(Twist)是螺旋桩的制造商。进一步了解螺旋桩的安装效果，对Twist乃至整个螺旋桩行业都具有重要意义。拟议研究的总体目标是量化安装引起的孔压产生及其对螺旋桩短期承载能力的影响。这项研究将导致更准确的设计和更大的信心，在整个基础社区的这种桩类型。