Formation of cracks during desiccation is a natural phenomenon in expansive clay. Mitigation of desiccation-induced cracks is highly beneficial for increasing the life span of geo-infrastructures particularly in hydraulic barriers. Improvement of soil properties using additives is a key method in controlling desiccation crack formation and their influence. This paper presents experimental results for an expansive clay modified with nylon fibre and an enzyme-based product. A series of desiccation cracking tests were carried out with varying fibre contents and a constant enzyme dosage. Three-point bending beam tests were performed to evaluate tensile strength of the modified clay. The additives, fibre and the enzyme were able to alter the crack patterns significantly thereby alleviating the effects of cracks. Furthermore, the addition of enzyme alone increased the tensile strength by about 50% while the combined effect of both fibre and enzyme increased the tensile strength by approximately 100% compared with untreated soil. Based on measurement of crack patterns and other properties of the modified clay, the investigation suggests the potential for the fibre-enzyme addition to mitigate desiccation cracks. Further work needs to be carried out to determine optimal dosing requirements for each additive and investigate the effects of potential interactions between the fibre and enzyme.

干燥过程中裂缝的形成是膨胀粘土中的自然现象。减少干燥引起的裂缝对于延长地质基础设施的使用寿命（特别是在水力屏障中）的使用寿命非常有益。使用添加剂改善土壤性质是控制干燥裂纹形成及其影响的关键方法。本文介绍了用尼龙纤维和酶基产品改性的膨胀粘土的实验结果。用不同的纤维含量和恒定的酶剂量进行了一系列的干燥开裂试验。进行了三点弯曲梁测试，以评估改性粘土的拉伸强度。添加剂，纤维和酶能够显着改变裂纹模式，从而减轻裂纹的影响。此外，与未处理的土壤相比，单独添加酶可将抗张强度提高约50％，同时纤维和酶的共同作用可将抗张强度提高约100％。根据裂缝图案和改性粘土其他性能的测量，研究表明添加纤维酶可减轻干燥裂缝的可能性。需要做进一步的工作以确定每种添加剂的最佳剂量要求，并研究纤维和酶之间潜在相互作用的影响。研究表明，添加纤维酶可以减轻干燥裂纹。需要做进一步的工作以确定每种添加剂的最佳剂量要求，并研究纤维和酶之间潜在相互作用的影响。研究表明，添加纤维酶可以减轻干燥裂纹。需要进行进一步的工作以确定每种添加剂的最佳剂量要求，并研究纤维和酶之间潜在相互作用的影响。