| Cite this article: | 刘武江,段青松,杨松,等.不同改良剂对红壤-土水特征曲线及吸附强度的影响研究[J].灌溉排水学报,0,():-. |
| LIU Wujiang,DUAN Qingsong,YANG Song,et al.不同改良剂对红壤-土水特征曲线及吸附强度的影响研究[J].灌溉排水学报,0,():-. |
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| Effects of Different Modifiers on Soil-water Characteristic Curve and Adsorption Strength of Red Loam Soil |
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LIU Wujiang1, DUAN Qingsong2, YANG Song2, XIONG Shoude3, BAO Ruiqin4, LI Liyang5,6,6,7, ZHANG Chuan8,9
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1.Yunnan Academy of Agricultural Engineering;2.College of Water Conservancy,Yunnan Agricultural University;3.Yunnan Geological Engineering Survey and DesignResearch Institute Limited Company;4.College of Resources and Environment,Yunnan Agricultural University;5.Yunnan Yuanke Land Consolidation and Rehabilitation and Planning &6.amp;7.Design Limited Company;8.College of Hydraulic Engineering, Yunnan Agricultural University;9.Research Center for Transition Development and Rural Revitalization of Resource-based Cities in China, China University of Mining and Technology
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| Abstract: |
| 【Objective】 Adding modifiers into slope soil will have a great influence on soil moisture. Revealing the soil-water characteristic curve and the change rule of adsorption strength during this process can provide a basis for slope treatment with modifiers.【Methods】 By measuring the matrix suction ψ and volume water content θv of red loam soil mixed with glutinous rice gum, wood fiber and glutinous rice gum/wood fiber with different content ratios, the soil-water characteristic curve was drawn and the changes of typical characteristic parameters were analyzed. The internal friction angle φ of the saturated state of red loam soil of different modifiers was determined by direct shear test, and the influence of different modifiers on the adsorption strength τψ of red loam soil was analyzed by combining the theory of Fredlund double stress variable shear strength.【Results】 (1) glutinous rice gum and wood fiber could increase the saturated water content θs of the soil, and mixed modifier vice versa; Glutinous rice gum and mixed modifier will reduce the residual water content θr of the soil-water characteristic curve, and wood fiber will only reduce the residual water content at a lower or higher content, and vice versa. The three modifiers could increase the inlet value ψa of the soil-water characteristic curve, and the mixed modifier > glutinous rice gum > wood fiber; Glutinous rice gum will reduce the residual value ψr of the soil-water characteristic curve, wood fiber will increase the residual value, and the mixed modifier is in between and higher than that of plain soil. The slope |k| of the soil-water characteristic curve of glutinous rice gum is the largest, followed by mixed modifier and wood fiber. (2) The red soil of different modifiers decreases with θv, the ψ increases, the adsorption strength τψ increases, and the shear strength decreases with the increase of ψ. In the range of 23.73%~30.76% volume water content, the adsorption strength of 2.5% fiber and 5% fiber is relatively large, followed by plain soil, 5% mixed and 2.5% mixed, and finally 2.5% glue, 5% glue and 0.5% glue.【Conclusion】 (1) Glutinous rice gum mainly affects the |k| value, resulting in accelerated the loss rate of soil water dispersion; Wood fiber has the greatest influence on θs, θr, and ψr, and the soil has good water retention and is not easy to lose water; Mixing the modifier to improve ψa is the best, the soil is not easy to lose water in the early stage (boundary effect stage), and the water-holding capacity is weakened by the influence of glutinous rice gum components in the middle and late stages. (2) The effect of different modifier on increasing τψ is: wood fiber> glutinous rice gum > mixed application. |
| Key words: Soil amendments; Red loam; Matric suction; Soil-water characteristic curve; The adsorption strength |
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