As a kind of problematic soil, collapsible soils can withstand relatively high stress in an unsaturated state. Still, upon wetting and being saturated, such soils show a significant sudden reduction in volume, causing damage to the structures. One of the environmentally friendly materials used to treat collapsible soils is the nano-clay as potential stabilizers. The present study investigates the nano-clay effect on the soil collapse treatment in the Sivand region, Fars Province, Iran. Further research proved to achieve fine dispersion of added nano-clay between the soil particles appropriately through the wet mixing method. To investigate effective soil collapse behavior parameters, 72 reconstructed samples with different water content, dry density, applied vertical stress, and nano-clay contents are tested using the static compaction method. The results indicate that soil collapse behavior is almost completely fixed using only 5% nano-clay. It has also been concluded that the collapse potential increases with reducing water content, dry density, nano-clay contents, while it has an increase if applied vertical stress increases. The extracted test results are used as a database to develop an efficient model to predict the soils’ collapse potential. Additionally, the parametric and sensitivity analyses confirm the model output with the test results.

湿陷性土作为一种有问题的土，在非饱和状态下能承受较高的应力。尽管如此，在润湿和饱和后，这些土壤的体积会突然显着减少，从而对结构造成损坏。用于处理可塌陷土壤的环保材料之一是作为潜在稳定剂的纳米粘土。本研究调查了纳米粘土对伊朗法尔斯省 Sivand 地区土壤塌陷处理的影响。进一步的研究证明，通过湿混法可以实现添加的纳米粘土在土壤颗粒之间的精细分散。为了研究有效的土壤坍塌行为参数，使用静压法测试了 72 个具有不同含水量、干密度、施加的垂直应力和纳米粘土含量的重建样品。结果表明，仅使用 5% 的纳米粘土就几乎完全固定了土壤塌陷行为。还得出结论，坍塌潜力随着含水量、干密度、纳米粘土含量的降低而增加，而如果施加的垂直应力增加，则坍塌潜力会增加。提取的测试结果用作数据库来开发有效的模型来预测土壤的坍塌潜力。此外，参数和灵敏度分析通过测试结果确认了模型输出。提取的测试结果用作数据库来开发有效的模型来预测土壤的坍塌潜力。此外，参数和灵敏度分析通过测试结果确认了模型输出。提取的测试结果用作数据库来开发有效的模型来预测土壤的坍塌潜力。此外，参数和灵敏度分析通过测试结果确认了模型输出。