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Numerical simulation on the influence of plant root morphology on shear strength in the sandy soil,Northwest China

Journal of Arid Land 2024年第10期16卷 1444-1462页

作者： ZHANG Lingkai SUN Jin SHI Chong College of Water Resources and Civil Engineering Xinjiang Agricultural UniversityUrumqi 830052China Xinjiang Key Laboratory of Water Conservancy Engineering Safety and Water Disaster Prevention and Control Urumqi830052China Geotechnical Research Institute Hohai UniversityNanjing 210098China

Serious riverbank erosion,caused by scouring and soil siltation on the bank slope in the lower reaches of the Tarim River,Northwest China urgently requires a *** roots play an important role in enhancing soil shear strength on the slopes to maintain slope soils,but the extent of enhancement of soil shear strength by different root distribution patterns is *** study used a combination of indoor experiments and numerical simulation to investigate the effects of varying plant root morphologies on the shear strength of the sandy soil in the Tarim *** results showed that:(1)by counting the root morphology of dominant vegetation on the bank slope,we summarized the root morphology of dominant vegetation along the coast as vertical,horizontal,and claw type;(2)the shear strength of root-soil composites(RSCs)was significantly higher than that of remolded soil,and the presence of root system made the strain-softening of soil body significantly weakened so that RSCs had better mechanical properties;and(3)compared with the lateral roots,the average particle contact degree of vertical root system was higher,and the transition zone of shear strength was more ***,vegetation with vertical root system had the best effect on soil protection and slope *** results of this study have important guiding significance for prevention and control of soil erosion in the Tarim River basin,the restoration of riparian ecosystems,and the planning of water conservancy projects.

关键词： root-soil composites discrete element method direct shear test simulation Tarim River

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