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Geomechanics and Engineering Volume 42, Number 5, September10 2025 , pages 373-383 DOI: https://doi.org/10.12989/gae.2025.42.5.373 |
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Mechanical response of straw fiber-soil interface subjected to freeze-thaw cycles |
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Chao Liu, Xiaojuan Yu, Guizhong Xu, Xingyu Wu and Ji Chen
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| Abstract | ||
| Natural fiber reinforcement effectively mitigates strength degradation in soils subjected to freeze-thaw cycles. Although natural fiber-soil interfacial strength plays a crucial role in controlling the behavior of fiber-reinforced frozen soils, the mechanisms underlying its evolution under freeze-thaw conditions are not yet fully understood. This study investigates straw fiber-soil interfacial strength using fiber pull-out tests, scanning electron microscopy tests, and nuclear magnetic resonance tests conducted after 0, 1, 3, 5, 10, 15, and 20 freeze-thaw cycles. The results show that interfacial strength decreases exponentially as the number of freeze-thaw cycles increases. This reduction is more pronounced at higher water contents or greater dry densities, primarily due to its positive correlation with pore development induced by freeze-thaw processes. Additionally, a calculation method is proposed for determining the critical straw fiber length in fiber-reinforced frozen soils, providing theoretical guidance for engineering applications in cold regions. | ||
| Key Words | ||
| critical straw fiber length; freeze-thaw cycle; interfacial strength; NMR analysis; SEM analysis; straw fiber-soil interface | ||
| Address | ||
| Chao Liu,Xiaojuan Yu and Xingyu Wu: School of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China Guizhong Xu and Ji Chen: School of Architecture and Engineering, Yancheng Polytechnic College, Yancheng 224005, Jiangsu, China | ||