The structures do not have enough strength if the foundation of most structures is reliant on weak clayey soil. Accordingly, improving problematic soil with large dispersion is one of the important problems ahead of researchers in geotechnical engineers. One of these types of soils is the clay which creates a lot of problems in the engineering project due to its special properties. A treatment method for the problems caused by these soils is chemical soil stabilization. In this study, by adding nano-iron oxide to clay soil, strength and consolidation parameters of this soil were investigated. For this purpose, index tests were conducted on the natural soil then nano-iron oxide was added to the studied soil with 0.5, 1, 2, 3, 4 and 5% and direct shear, unconfined compressive strength and consolidation tests were carried out. Also, scanning electron microscopy (SEM) was used to evaluate and compare the textural features of the soil, before and after stabilization. The results indicated that adding nano-iron oxide up to 2% can lead to increased strength parameters (including cohesion and internal friction angle) and reduced compressibility and swelling coefficients of the studied soil.

如果大多数结构的基础依赖于软质黏土，则结构没有足够的强度。因此，改良具有大分散性的有问题的土壤是岩土工程师研究人员面临的重要问题之一。这些类型的土壤之一是粘土，由于其特殊的特性，它在工程项目中产生了很多问题。由这些土壤引起的问题的处理方法是化学土壤稳定化。在这项研究中，通过在粘土中添加纳米氧化铁，研究了该土壤的强度和固结参数。为此，在天然土壤上进行指标测试，然后将纳米氧化铁分别以0.5％，1、2、3、4和5％的比例添加到研究的土壤中，并进行直接剪切，无侧限抗压强度和固结测试。还，在稳定化之前和之后，使用扫描电子显微镜（SEM）评估和比较土壤的质地特征。结果表明，添加最高2％的纳米氧化铁会导致强度参数（包括内聚力和内摩擦角）增加，并且降低了所研究土壤的可压缩性和溶胀系数。