为了研究加筋纤维对膨胀土胀缩性及力学性能的影响，进行了大量的室内试验，研究了纤维的含量对膨胀土的胀缩性、压缩性、应力应变曲线及抗剪性的关系。研究表明：膨胀土的收缩性随纤维含量的增加而显著降低；纤维膨胀土的应力应变曲线随纤维含量的增加，破坏时的极限应变增大，破坏后的应力降大大减小；纤维膨胀土随纤维含量的增加，其内聚力增加而内摩擦角减小，当纤维含量增加到一定程度时，内摩擦角增大，而内聚力减小。

For grasping the impact of reinforced fiber on swell-shrinking property and other mechanics performances of expansive soil, a great deal of indoor experiments are conducted to study various relationships among fiber content and other mechanics performances, i.e. swell-shrinking property, compressibility, stress-strain, and shearing strength. The study results show as follows: The swell-shrinking property apparently decreases with the increase of fiber content; the limiting strain will increase with the increase of fiber content, but the stressdrop will greatly decrease as the damageof the soil; fiber expansion soil’s ?cohesion will increase but internal friction angle will decrease as the fiber content increase, but when the content is added to a certain extent, the former will decrease and the latter will increase.