Thesis Format
Integrated Article
Degree
Master of Science
Program
Civil and Environmental Engineering
Supervisor
El Naggar, M. Hesham
Abstract
The foundations for soundwalls pose unique design challenges that require small and closely spaced piles. Due to their relatively short length, these piles are susceptible to seasonal ground freezing, which causes heave deformations that damage the soundwall. There remains a gap in understanding the behavior of lightly loaded foundations supporting these soundwalls in seasonally frozen areas. To address this, a laboratory-scale testing system was developed to investigate the behavior of H-piles under the cumulative effects of freeze-thaw cycles (FTCs). The study generated comprehensive data on soil and pile temperature, heave, and thawing dynamics, capturing evolving soil-pile interactions under varying FTCs. These results were used to establish model pile performance limits for both total and differential displacement. Recommendations are provided on the upper limits of frost-induced effects on the pile, highlighting the experiment's extreme conditions using silt soil, known for its heightened heave displacement compared to other soil types.
Summary for Lay Audience
Sound walls are designed to mitigate the impact of noise pollution in sensitive areas and buildings. At present, the design process of sound wall foundations, specifically those involving steel piles, is greatly affected by freeze-thaw cycles. These cycles induce deformations, leading to structural damage and playing a significant role in determining the stability of structures in colder regions. The number of studies that have delved into steel pile design in the context of sound wall foundations, particularly their behaviour under cumulative freeze-thaw deformations, remains limited. Current design approaches overdesign the steel piles’ length or resort to concrete piles that are non-environmentally friendly. The experimental program aims to develop a performance-based design approach that yields tangible outcomes, replacing concrete piles and reducing the amount of steel used. This initiative will contribute to the construction of structures that are not only aesthetically pleasing and functional but also energy-efficient and environmentally sustainable.
Recommended Citation
Bolbol, Omar, "New Approach to the Design of Lightly Loaded Piles Under Adfreeze Action" (2024). Electronic Thesis and Dissertation Repository. 10140.
https://ir.lib.uwo.ca/etd/10140