It is a good practice to change the soil properties when dealing with inappropriate soils in geotechnical engineering, which is referred to as soil improvement. In this study, the effect of lignosulfonate (2% weight ratio of soil as an optimum percentage), stabilizer and PP fibers (0.4, and 0.8% weight ratio of stabilized soil) as reinforcement on the soil durability of clayey sand was investigated. For this purpose, 23 unconfined compressive strength tests, 11 durability tests, 60 ultrasonic pulse velocity (UPV) tests, 7 SEM tests, 2 Atterberg limit tests, and 4 standard compaction tests were performed. The results of this study showed that the addition of lignosulfonate improves the durability of clayey sand. However, the stabilized sample only resisted two Cycles of Wet-Drying. The addition of fibers increased the durability of stabilized samples up to 12 cycles by 0.8%. Therefore, this amount of fiber is recommended for improving the behavior of soil stabilized with lignosulfonate. The accumulate loss of mass diagram indicated that the addition of fiber in lignosulfonate treated soils causes a reduction in the Mass-loss rate of the spacemen. Also, by increasing the number of cycles, samples showed softer behavior, and the ultrasonic pulse velocity was reduced, which these results can be interpreted from the deformation coefficient equivalent to 50% strength diagram and ultrasonic pulse velocity of stabilized and reinforced samples. The SEM results showed that the flocculated structure and also the 3D reinforcement by fibers prevented the weight loss of the materials. Finally, the results of UPV test showed that it could be used as a non-destructive test to control the durability of lignosulfonate-stabilized soils.

在岩土工程中处理不适当的土壤时，最好改变土壤性质，这被称为土壤改良。在这项研究中，研究了木质素磺酸盐（占土壤最佳重量百分比的2％），稳定剂和PP纤维（0.4和0.8％的稳定化土壤重量）作为增强剂对黏性砂土的耐久性的影响。为此，进行了23项无侧限抗压强度测试，11项耐久性测试，60项超声脉冲速度（UPV）测试，7项SEM测试，2项Atterberg极限测试和4项标准压实测试。这项研究的结果表明，添加木质素磺酸盐可以改善粘土的耐久性。但是，稳定后的样品仅能抵抗两个干燥循环。纤维的添加使稳定样品的耐久性提高了高达12个循环，提高了0.8％。因此，建议使用这种数量的纤维来改善木质素磺酸盐稳定的土壤的性能。累积质量损失图表明，在木质素磺酸盐处理的土壤中添加纤维会导致太空人的质量损失率降低。另外，通过增加循环次数，样品表现出较软的行为，并且超声脉冲速度降低，这些结果可以从相当于50％强度图的变形系数以及稳定和增强样品的超声脉冲速度来解释。SEM结果表明，絮凝结构以及纤维的3D增强作用阻止了材料的重量损失。最后，