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Variations law of permeability coefficient of soil columns at different depths under different forms
Figures of the Article
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Test devices
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Spherical ceramic particles
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Grain-size distribution curves of coarse-grained soil
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Particle composition in muddy water
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Grain-size distribution curves of various particle component
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Typical clogging forms of coarse-grained soil columns under different controlled particle sizes
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Variation laws of deposition rate under various working conditions
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Variation curves of relative porosity under different water heads
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Variation curves of relative porosity of two kinds of coarse-grained soil
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Variation laws of relative porosity at different depths of soil columns
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Variations law of permeability coefficient of soil columns at different depths under different forms
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Test and theoretical overall permeability curves under four clogging conditions
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Comparison between stage 2 tests and improved permeability coefficient results by Formula (18)
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Comparison between stage 2 tests and improved permeability coefficient results by Formula (19)
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Linear fitting relationship between weight coefficient and control particle size
Tables of the Article
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Physical and mechanical parameters of coarse-grained soil columns
工况 粒径 不均匀系数
Cu等效颗粒粒径de/mm 干密度ρd/(g·cm-3) 初始孔隙率n0 有效孔隙直径De/mm 渗透系数k/(cm·s-1) 土样1 2~3 mm 1.24 2.45 2.53 0.397 0.56~0.70 4.76 土样2 1~8 mm 5.09 1.72 2.40 0.357 0.36~0.46 2.97 -
Dry densities and permeability coefficients of various particle components
C0.075/% 干密度ρd/(g·cm-3) 渗透系数k/(cm·s-1) 0 2.41 3.00×10-2 9.17 2.40 6.78×10-3 18.73 2.37 1.09×10-3 28.50 2.33 5.56×10-4 38.96 2.31 5.09×10-4 49.98 2.30 4.01×10-4 58.13 2.25 9.68×10-5 69.40 2.22 8.63×10-5 79.48 2.18 6.27×10-5 90.56 2.16 3.41×10-5 -
Discrimination of clogging forms of coarse-grained soil
淤堵
形态表层淤积淤堵形态（S） 表层-内部双重淤堵形态（S-I） 内部孔隙淤堵形态（I） 暂态孔隙淤堵形态（P） C0.075 ≤20% 20%~60% 60%~80% ＞80% -
Soil parameters
C0.075 阶段 决定系数R2 均方根误差
RMSE0 阶段1 0.99 0.04 阶段2 0.85 0.404 阶段3 0.98 0.086 28.5 阶段1 0.43 2.04 阶段2 0.68 0.41 阶段3 0.99 0 58.13 阶段1 -1.02 2.78 阶段2 0.92 0.22 阶段3 1.00 0 79.49 阶段1 -1.82 3.13 阶段2 0.97 0.26 阶段3 1.00 0 90.56 阶段1 -1.27 2.53 阶段2 0.98 0.27 -
Error indexes of permeability coefficient by improved formula and tests
工况 阶段 R2 RMSE 未改进 阶段1 0.99 0.04 阶段2 0.85 0.404 阶段3 0.98 0.086 改进 阶段1 0.99 0.04 阶段2 0.96 0.09 阶段3 0.98 0.086 -
Error indexes of permeability coefficient by improved formula and test
改进与未改进 阶段 R2 RMSE 未改进 阶段1 -1.02 2.78 阶段2 0.92 0.22 阶段3 1 0 改进 阶段1 1 0 阶段2 0.99 0.008 阶段3 1 0
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