Abstract
To improve the stability of sloping farmland, the optimum ratio for parameter of composite soils was determined. Plain and mixed composite soils were prepared with three improved materials of glutinous rice glue, wood fibres and coarse sand for laboratory to tests and experiments. For different moisture and soil contents, the shear strength, cohesion and internal friction angle of the composite soils were analysed and the proportions were adjusted based on the suitability of plant growth. Slope stability analysis was performed in combination with the case of slope farmland improvement. The results show that the soil improvement materials were affected by the different moisture content, the degree of influence of moisture content on soil shear strength and parameters: wood fibre composite soil > glutinous rice glue composite soil > coarse sand composite soil > plain soil. The soil amendments affected the soil mechanical properties and effectively improved soil stability, the degree of influence of soil amendments on the soil shear strength and parameters: wood fibre composite soil > glutinous rice glue composite soil > coarse sand composite soil. According to the shear strength and total biomass, the optimum contents of glutinous rice glue, wood fibre and coarse sand in the mixed composite soil were 1.5%, 2.5% and 15%. The case application shows that the minimum safety factor of the mixed composite soil was higher than the plain composite soil at slopes of 10°, 15° and 20°. The overall slope stability of the mixed composite soil was improved with different moisture contents, which is suitable for plant growth.
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Funding
Funding were provided by the Natural Science Foundation, China (Grant Nos. 41867038, 41662021 and 32160304), the ministry of natural resources “Technical Innovation Team for land allocation and ecological consolidation in Southwest diversified regions”, China (Grant No. YNTD2018KF05), and the Yunnan province Natural Science Foundation, China (Grant No. 202001AU070114 and 202101AT070754). For help with the collection data and revise this article, we would like to thanks professor Jianxin Yu of Yunnan Agricultural University.
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Zhang, C., Liu, W., Li, X. et al. Study on the influence of composite soil on the slope stability of farmland during in land consolidation. Environ Earth Sci 81, 166 (2022). https://doi.org/10.1007/s12665-022-10266-3
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DOI: https://doi.org/10.1007/s12665-022-10266-3