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土水特性影响并控制着非饱和膨胀土的工程特性。基于扫描电子显微镜试验和GDS非饱和应力路径系统试验,对合肥新桥机场场地原状非饱和膨胀土在失水和吸水过程中土水特征曲线进行研究,并数值反演相应的土水特征曲线、相对渗透系数和土水扩散系数,研究得出工程区域原状膨胀土微结构易于形成微裂隙,吸湿土水特征曲线较失水过程的土水特征曲线存在明显的滞后性。数值分析结果表明,Fredlund模型与实测结果吻合较好,研究结果为新桥机场膨胀土地基处理方案的制定提供了一定依据。
Soil water characteristics affect and control the engineering properties of unsaturated expansive soils. Based on the scanning electron microscopy (SEM) and the GDS unsaturated stress path test, the soil-water characteristic curves of intact unsaturated expansive soil in Hefei Xinqiao Airport during water loss and water absorption were studied. The corresponding soil-water characteristic curves were obtained by numerical inversion. Relative permeability coefficient and soil water diffusion coefficient, it is concluded that the microstructure of undisturbed expansive soil in the engineering area tends to form micro-cracks, and the characteristic curve of soil-water characteristics of moisture-absorbing soil-water has obvious lag characteristics compared with that of water-loss process. Numerical analysis results show that the Fredlund model is in good agreement with the measured results, and the research results provide a basis for the formulation of the expansive soil foundation treatment scheme of Xinqiao Airport.