In order to explore the effect of partial particle loss on the compression consolidation and permeability characteristics of the corrosion-prone purple soil in the Three Gorges Reservoir area, one-dimensional consolidation compression test was conducted on the corrosion-prone purple soil in the Three Gorges Reservoir area, with the design dry density of 1.50, 1.45, 1.39, 1.34 g/cm3 and the loss degree of different particle groups: No deletion, deletion less than 0.075 mm grain group, deletion less than 0.25 mm grain group, deletion less than 0.5 mm grain group, deletion less than 1mm grain group two groups of variable orthogonal test; Four types of nonlinear relation between permeability coefficient and pore ratio were used to fit the test data. The results show that: (1) With the absence of particle group, the inhomogeneity coefficient Cu decreases, the average particle size increases, and the compression coefficient a1-2 decreases first and then increases; The consolidation coefficient Cv1-2 firstly decreases, then increases and then decreases. The framework effect of coarse particles also has an important effect on the permeability coefficient of coarse particles. (2) The four nonlinear permeability models are applicable to purple soil in the Three Gorges Reservoir area, among which the lg[k(1+e)]－lge permeability model has the best fitting effect on the test data, the highest correlation degree, and the form is simple.
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