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Study on the change of root strength under freezing and thawing

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Document pages: 14 pages

Abstract: The purpose of this paper is to study the effect of effective roots of rhizome plants on slope soil reinforcement under freeze-thaw conditions. This study mainly studied the mechanical properties between the roots and clay of four plants from different regions of China (northeast, north, central and southern regions): Dogtail grass, Indian wild Dogtail grass, Zoysia japonica and Carex alba. Based on the interfacial friction effect between plant roots and soil, the pull-out test and unconfined compressive strength test of reinforced soil system with different freeze-thaw cycles were carried out. According to the results of interface friction test, several stages of root extraction process in clay were clearly put forward. resultts showed that the friction effect between Zoysia japonica roots and the soil was the most significant and that these roots had the best reinforcement effect. In contrast, the friction and reinforcement effects between Setaria viridis roots and the soil were the worst, and the resulting unconfined compressive strength was the smallest. However, the freeze-thaw resistance ability of the Setaria viridis and soil system was stronger than that of the Zoysia japonica system.

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