Electronic Thesis and Dissertation Repository

Thesis Format

Integrated Article

Degree

Master of Engineering Science

Program

Civil and Environmental Engineering

Supervisor

Newson, Timothy

Abstract

This research investigates the mechanics of frost heave and its influence on small piles. Frost heave, which results in the upward movement and deformation of the ground surface due to freezing temperatures penetrating the soil is a critical concern in cold climate regions. The study examines various methods for predicting frost heave and pile-soil interaction, encompassing empirical, analytical, and numerical approaches. It was found that there are advantages of centrifuge modeling, allowing researchers to replicate freezing and thawing processes at a reduced scale, thus providing dependable data for investigating deformation and failure mechanisms and ultimately pile behavior. Moreover, the work found significance of accurately estimating the depth of freezing and resulting frost heave to design physical model tests. The work revealed scaling conflicts and the necessity for further validation of predictive methods to establish reliable pile design approaches for frost heave resistance.

Summary for Lay Audience

This research explores frost heave, a phenomenon in geotechnical engineering where freezing temperatures cause the ground to lift and deform. This issue is particularly important in cold climates, where it can affect the stability of structures and roads.

The study looks at different ways to predict frost heave, including methods based on real-world observations, mathematical calculations, and computer simulations. One key focus is on centrifuge modeling, a technique that allows researchers to simulate freezing and thawing in a controlled environment with scaled physical models. This method helps generate reliable data to better understand how frost heave can cause ground deformation and potential failures.

A major aspect of the research is accurately determining how deep the freezing extends into the soil, which is crucial for designing effective tests that mimic field conditions. The study also examines how frost heave affects small piles used in construction, utilizing both centrifuge modeling and analytical techniques.

Through this work, the researchers identified some challenges in scaling these model tests to real-life situations, highlighting the need for more validation of their predictive methods. Ultimately, the goal is to develop reliable strategies for designing structures that can withstand the effects of frost heave, ensuring safety and durability in cold climates.

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