Abstract
The seepage characteristics of sand affect its strength, mechanical deformation characteristics, and find safety and stability. The drag coefficient is a dimensionless physical quantity expressing the interaction between fluid and particles, it is also an important parameter that characterizes the permeability of granular soils. Through the seepage test of standard sand with single particle sizes and different grades, analyze the seepage laws of standard sand with different particle sizes in the Darcy and non‐Darcy seepage. The relationship between parameters a and b in the seepage equation and porosity (n), average particle size (d50), nonuniformity coefficient (CU), and curvature coefficient (CC), and their influence degree were studied. An empirical formula for determining the permeability coefficient of standard sand is established. By adding a correction factor and verifying its rationality, the empirical formula of standard sand permeability parameters is finally obtained.
Highlights
Sandy soil is the particles with a particle size greater than 0.075 mm accounting for more than 50% of the total mass
When the seepage force is too large, relative movement between soil particles and even overall movement of the soil body will occur, and seepage deformation or even destruction will occur [1, 2], causing damage to dams and foundation pits [3, 4], slope instability [5, 6], ground uplift, and other issues [7, 8]. aisiam et al [9] believed that after seepage erosion, with the continuous movement of fine particles, some pores in the sand may be blocked or enlarged, which will result in the change of the soil permeability coefficient
In order to explore the factors affecting the permeability of sandy soil, Su et al [12] carried out a single particle size and different gradation sand soil permeability tests and found that the factors affecting permeability are sand gradation, porosity, and particle size
Summary
Sandy soil is the particles with a particle size greater than 0.075 mm accounting for more than 50% of the total mass. E research results of scholars at home and abroad show that the seepage curve of low-permeability porous media (that is, the relationship between flow velocity and hydraulic gradient) is no longer a simple linear feature but presents a non-Darcy seepage feature Researchers such as Liu [16], Zhu and Ling [17], Zhang [18], and Qian et al [19] conducted a large number of indoor permeability experiments in terms of particle size, porosity, gradation, etc. Study the relationship between the parameters in the seepage equation and the porosity, average particle size, nonuniformity coefficient and curvature coefficient, and the degree of influence, establish an empirical formula suitable for determining the permeability coefficient of standard sand, and verify its rationality by adding correction factors, and obtain the empirical formula of standard sand permeability parameters to guide the safety and stability analysis and evaluation of actual sand foundation engineering
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