Multi-scale Analysis of Particle Infiltration and Sedimentation in Water-rich Sand Layers
To elucidate the multi-scale particle percolation and diffusion processes within water-rich sandy layers,sedimentation and permeability tests were conducted on suspended matter,colloids,and solutes extracted from the drainage sand layer of a tailings pond.Based on the different particle sizes of suspended solids,colloids,and solutes,sedimentation experiments were conducted using solutions mixed with at least two different particle sizes.It was found that suspended solids easily neutralize the charged colloidal particles in the colloids,and secondly,high-valent cations positively promote the binding of colloids.Permeation tests were conducted on water-rich sand layers using multi-scale mixed percolation solutions.The percolation range of the percolate within the water-rich sand layer resembled a spherical shape,and the porosity of the sand layer depended on the structural properties of the complexes formed by the interaction of suspended solids,colloids,and solutes.Based on Matlab software,the multi-scale particle penetration and migration process was simulated,considering the effects of complex boundary slippage and tortuosity.A multi-scale particle penetration and diffusion model was constructed,revealing that larger complex particle sizes resulted in smaller slippage lengths at the sand layer boundary,more pronounced tortuosity of the seepage path,and an increase in penetration and diffusion lengths.
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