Expansive soils may naturally exist or used as a compacted material and its behavior should be examined under conditions simulating real field conditions. In field, there are two possible loading/wetting conditions may be experienced by expansive soils. One is that it may be flooded after finishing of structure construction, while the other possible condition is that where flood come first and followed by staged construction for the structure. This study simulates the probable field loading/wetting conditions and examined the impact of their sequence on the hydraulic and mechanical behavior of expansive soils at saturation. Results of the experimental program indicates that stress path sequence has an uneven influence on the hydraulic and mechanical behavior of expansive soils. Moreover, volume change potential, swell pressure (σ_s), hydraulic conductivity (k), as well as shear strength (τ_f) is dependent on applied axial stress (σ_a), however, the key variable of all these characteristics is the void ratio (e). Finally, impact of level of loading is more pronounced on hydraulic conductivity (k) than other investigated characteristics.

膨胀土可能自然存在或用作压实材料，应在模拟真实田间条件的条件下检查膨胀土的行为。在野外，膨胀土壤可能会经历两种可能的加载/润湿条件。一个是在结构施工结束后可能会被洪水淹没，而另一个可能的条件是首先出现洪水，然后是分阶段施工。这项研究模拟了可能的田间荷载/润湿条件，并研究了其顺序对饱和状态下膨胀土的水力和力学行为的影响。实验程序的结果表明，应力路径顺序对膨胀土的水力和力学行为有不均匀的影响。此外，体积变化的潜力，膨胀压力（σ_小号），渗透系数（K），以及剪切强度（τ _˚F）是依赖于施加的轴向应力（σ_一个），但是，所有这些特征的关键变量是空隙率（e）中。最后，负荷水平对水力传导率（k）的影响比其他研究特征更为明显。