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Abstract

As a natural material for rock and soil mass reinforcement, coir fiber has advantages such as easy degradation, low cost, and environmental friendliness compared to artificial chemical reinforcement materials. This paper studied the improvement effect of coir fiber reinforcement on the engineering properties of subgrade expansive soil by conducting the immersion swelling test, CBR test, and large-scale direct shear test, with the influence of different types of coir fiber, reinforcement positions, and reinforcement layers considered. The results indicate that under all reinforcement schemes, the expansive force ratio and expansive rate ratio are both less than 1, which indicates that coir fiber reinforcement can reduce expansion, with lime coir fiber having the most significant effect. After adopting coir fiber reinforcement, the California bearing ratio (RCBR) of the expansive soil meets the requirements of the upper embankment, and RCBR of the expansive soil reinforced with lime coir fiber satisfies the requirements of the lower roadbed. Additionally, coir fiber reinforcement significantly improves the shear strength of expansive soil, but the effect of coir fiber types on shear strength is not significant.

Publication Date

11-8-2022

DOI

10.14048/j.issn.1671-2579.2022.05.043

First Page

237

Last Page

240

Submission Date

April 2025

Reference

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