准确方便地预测压缩变形影响下压实黄土的土水特征曲线和渗透系数，对于黄土填方工程的渗流分析具有重要实际意义。针对延安压实黄土试样，开展了吸力控制的等向压缩试验，分析了其力学增湿效应。在此基础上，将孔隙比相关的幂次方程引入Fredlund-Xing模型，并充分考虑吸附水对高吸力段渗透系数的贡献，以及孔隙比对饱和渗透系数的影响，构建了考虑压缩变形的土水特征曲线和渗透系数预测模型。模型共含7个参数，可通过吸力控制的压缩试验和饱和渗透试验获得。预测结果表明：采用的模型可较准确地预测广吸力范围内任意孔隙比下压实黄土的土水特征曲线和渗透系数曲线；随着压缩变形过程中孔隙比的减小，压实黄土土水特征曲线的进气值增大，曲线整体向右上方移动，其渗透系数在低吸力段呈现减小趋势，在中高吸力段则为增大的态势。研究成果可用于黄土填方工程的渗流分析。

[Objective] Based on suction-controlled triaxial isotropic compression tests on compacted loess， this study establishes a soil-water characteristic curve （SWCC） and hydraulic conductivity prediction model that accounts for compression deformation. This work aims to provide an accurate and convenient method for predicting the SWCC and hydraulic conductivity of compacted loess under compressive deformation， facilitating seepage analysis in loess embankment engineering. [Method] This study takes the Q₂ compacted loess samples from the Phase I Project of mountain flattening and city construction in Yan’an New Area as the research object. Four sets of isotropic compression tests under different constant suctions （y=25， 37， 50， 100 kPa） were conducted by using a GDS unsaturated triaxial apparatus. Building upon the test findings， a power function related to the void ratio is introduced into the four-parameter Fredlund-Xing model to establish a SWCC model considering compressive deformation. The model has fewer parameters， requiring only 7 parameters； the tests are simple， as the model parameters can be obtained only through suction-controlled compression tests and saturated permeability tests； （3） the model also considers the influence of adsorbed water on the hydraulic conductivity. The proposed model is applied to predict the SWCC and hydraulic conductivity curve of Yan’an compacted loess within a wide suction range， and the predicted results are compared with measured test data. [Results] （1） Compressive deformation causes a significant mechanical wetting effect， specifically manifested as follows： a. during the constant suction loading process， the degree of saturation of the samples increases significantly with the development of compressive deformation； b. in the process of compressive deformation， the SWCC of the samples shifts overall to the right as the void ratio decreases， and the air entry value increases significantly. （2） The proposed model can accurately predict the SWCC and hydraulic conductivity of compacted loess under any void ratio within a wide suction range， and its prediction accuracy in the high suction range is significantly higher than that of the Gallipoli model and the CCG model. In addition， the proposed model is used to predict the influence of compressive deformation. During compressive deformation process， as void ratio decreases， the soil-water characteristic curve of compacted loess gradually shifts to the upper right， and the air entry value increases significantly. In the low suction range， the hydraulic conductivity of compacted loess decreases with the decrease of void ratio， while in the medium and high suction ranges， the hydraulic conductivity increases with the decrease of void ratio. The response of the hydraulic conductivity of compacted loess to compressive deformation is essentially caused by the change of the cross-sectional area of water flow and flow paths due to the change of micro-pores. [Conclusion] The proposed model provides a reliable tool for understanding the soil-water characteristics and permeability behavior of compacted loess under compressive deformation. It not only improves the accuracy of seepage analysis in loess filling projects but also provides a theoretical basis for evaluating the stability and safety of engineering structures built on compacted loess.