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

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的实现，这种桩型在加拿大各地越来越普遍。螺旋桩现在是低层商业和住宅建筑、输电塔和模块化建筑等结构的首选基础解决方案。螺旋桩对土体的扰动小于常规桩对土体的扰动；然而，很少有研究对这种差异进行量化或确定其对桩容量的影响。由于这一研究空白，安装扰动引起的短期容量下降难以预测，往往被忽视。这些缺陷可能导致不适当的能力估计和设计不足。Twist Development Inc. （Twist）位于艾伯塔省勒杜克，是一家螺旋桩制造商。进一步研究螺旋桩安装效果的认识，对Twist乃至整个螺旋桩行业都具有重要意义。本研究的总体目标是量化安装引起的压力产生及其对螺旋桩短期承载力的影响。这项研究将导致更准确的设计和更大的信心，这种类型的桩在整个基础社区。

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.