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.
Highlights
Single and mixed composite soils were prepared with three improved materials of glutinous rice glue, wood fibres and coarse sand for indoor direct shear tests and pot experiments
Based on the different moisture and soil contents, the shear strength, cohesion, and internal friction angle of the composite soil were analyzed, and the proportioning parameters were adjusted according to the suitability of plant growth
According to the shear strength and the suitability of plant growth, the contents of the glutinous rice glue, wood fibre, and coarse sand of the mixed composite soil were determined by the optimal ratio parameters of 1.5%:2.5%:15%. (3)In this application, the minimum safety factor of mixed
Summary
Soil loss on sloping farmland is a common problem related to land use in hilly areas. According to the shear strength and the suitability of plant growth, the contents of the glutinous rice glue, wood fibre, and coarse sand of the mixed composite soil were determined by the optimal ratio parameters of 1.5%:2.5%:15%. Research on the mechanical properties of the soil of sloping farmland mainly focuses on different land use types(Li. 2017), farming methods (Du et al 2018), rainfall intensities and slopes (Yuan et al 2015), soil particles (Fan 2019), soil bulk densities and moisture contents (Zhang et al 2020), plants (Ding et al 2017; Pu et al 2014; Shi et al 2016) and other influencing factors on the response the of soil shear strength, without considering the effect of soil amendments on the mechanical properties of soil. In this paper, three materials, glutinous rice glue, wood fibre, and coarse sand, were separately prepared and combined with different moisture contents and content differences, while direct shear tests on unsaturated composite soil were carried out to study the characteristics of soil shear strength and its changing laws. The research results can provide a theoretical basis and application foundation for land improvement projects
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