关键词: 玄武岩纤维, 玻璃纤维, 纤维加筋土, 无侧限抗压强度, 纤维锚固

Abstract:

To investigate how different fibers influence soil reinforcement, basalt fiber and glass fiber were separately added to the same soil. Unconfined compressive strength tests were performed to compare the stress-strain curves and analyze the relationship between strength and both fiber content and fiber length for the two types of fiber-reinforced soil. Additionally,fiber anchorage test was conducted to explore the mechanisms of fibers enhancing soil strength. The results demonstrate that fiber-reinforced soil exhibits significantly greater compressive strength compared to plain soil. As fiber length increases, the strength of both basalt and glass fiber-reinforced soils first rises and then falls, with the optimal fiber length being 9 mm. Similarly, increasing fiber content causes the strength of both types of fiber-reinforced soil to fluctuate, with two peaks observed; the optimal fiber content is 0.5%. The fiber anchorage tests reveal that the pull-out force of the fibers varies with changes in fiber spacing. At small spacings, fibers interact, resulting in peak and valley values of pull-out force. As fiber spacing increases and reaches a critical anchorage distance, fibers no longer affect each other.

Key words: basalt fibre, glass fibre, fiber-reinforced soil, unconfined compressive strength, fiber anchorage