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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Influence of Frequency on the Mechanical Behaviour of a Soft Soil Reinforced with Fibres
Jorge Villarroel-Ortega1,2, Antonio Alberto S. Correia3, Paulo J. Venda Oliveira4, and Luis J. L. Lemos5
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DOI:10.17265/1934-7359/2026.06.004
1. Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal 2. Department of Construction Engineer, University of Magallanes, Punta Arenas 6200000, Chile 3. CIEPQPF, Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal 4. ISISE, Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal 5. CGEO, Department of Civil Engineering, University of Coimbra, Coimbra 3030-788, Portugal
The chemical stabilization of soils has been applied worldwide with success to improve the mechanical properties of soils. However, it is known that chemical stabilization of soils induces poor tensile and flexural strength and a brittle behaviour which prevents its application in seismic areas and where is subjected to horizontal displacements. Reinforce the composite material with fibres. This work aims to study the influence of the frequency in cyclic loading on the mechanical behaviour of a soft soil chemically stabilized unreinforced and reinforced with synthetic fibres is one of the solutions. Unconfined compressive strength tests were carried out before and after the cyclic loading, changing the frequency of the cyclic loading (0.25, 0.5, 1, and 2 Hz). The laboratory work was complemented with the study of the permanent axial strain during the cyclic stage. The results indicate that the addition of synthetic fibres decreases the brittleness of the composite material inducing a residual strength to the material. Furthermore, the strength decreases with the increment of the frequency, more than on the unreinforced material. Moreover, the permanent axial strain observed during the cyclic stage show a deterioration of the mechanical behaviour as the frequency applied increases.
Chemical stabilization, soft soils, unconfined compression strength test, cyclic loading, frequency.
Jorge Villarroel-Ortega, Antonio Alberto S. Correia, Paulo J. Venda Oliveira, and Luis J. L. Lemos. (2026). Influence of Frequency on the Mechanical Behaviour of a Soft Soil Reinforced with Fibres, Journal of Civil Engineering and Architecture, June 2026, Vol. 20, No. 6, 232-237.
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