Effect of fiber reinforcement on shear strength and void ratio of soft clay

Mirzababaei, M, Arulrajah, A, Haque, A, Nimbalkar, S and Mohajerani, A 2018, 'Effect of fiber reinforcement on shear strength and void ratio of soft clay', Geosynthetics International, vol. 25, no. 4, pp. 471-480.

Document type: Journal Article
Collection: Journal Articles

Title Effect of fiber reinforcement on shear strength and void ratio of soft clay
Author(s) Mirzababaei, M
Arulrajah, A
Haque, A
Nimbalkar, S
Mohajerani, A
Year 2018
Journal name Geosynthetics International
Volume number 25
Issue number 4
Start page 471
End page 480
Total pages 10
Publisher I C E Publishing
Abstract In this study, a series of multi-stage drained reverse direct shear tests were carried out on soft clay samples reinforced with 0.25% and 0.50% polypropylene fibers of 6 mm, 10 mm and 19 mm in length. Tests were carried out at different normal effective stresses and cumulative horizontal shear displacement of 1.17 times of the sample width. Results showed an increase of the shear strength with the increase of fiber content and length. However, the rate of improvement was capped with the normal effective stress applied during the shearing stage. At a high normal effective stress, the shear strength of the fiber-reinforced soft clay approached that of the reinforced clay regardless of the amount of fiber inclusion. The rate of shear strength improvement decayed with the number of shear cycles. Fiber reinforcement also resulted in a reduction of the compressibility of the soft clay at consecutive consolidation and shear stages. Although the effective internal friction angle of the soft clay was not altered significantly with the fiber reinforcement, the effective cohesion of the soft clay improved significantly as much as 6.4 and 8.5 times with the inclusion of 0.25% and 0.50% of 10 mm long fibers, respectively.
Subject Civil Geotechnical Engineering
Keyword(s) Geosynthetics
Fiber reinforcement
Fiber length
Drained shear strength
Reverse direct shear test
Multi-stage test
Soft clay
DOI - identifier 10.1680/jgein.18.00023
Copyright notice © 2018 Thomas Telford Ltd
ISSN 1072-6349
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