干湿循环对纤维膨胀土特性影响的试验研究

Features study of impact on fiber expansive soil with wetting-drying cycles

为了研究干湿循环对膨胀土和聚丙烯纤维膨胀土强度的影响,进行了大量的试验研究。试验结果表明,膨胀土和纤维膨胀土随着干湿循环次数的增加,裂隙逐渐发展,土样的整体性遭到破坏,抗剪强度也随着循环次数的增加而降低;纤维可以增加膨胀土强度,提高土体的整体性。膨胀土和纤维膨胀土的粘聚力随着循环次数增加而降低的趋势一致,表明纤维是以强度增量作用于膨胀土,且这个强度增量不随着干湿循环次数的增加而发生变化。

To study the impact that the wetting-drying cycles cause on the strength of expansive soil and fiber expansive soil,a lot of indoor experiment was conducted.The results show that the fissures of expansive soil and fiber expansive soil are developing with the wetting-drying cycles,and the integrity is destroyed,and the shear strength degrades.The trend of strength of expansive soil is consistent with fiber expansive soil＇,which shows that the fiber reinforces the expansive soil with an increment of strength,and this increment doesn＇t change with the wetting-drying cycles.