Abstract
With the application of fiber-reinforcement technology, the mechanical properties of silty clay are improved with fiber reinforcement. However, the variation of permeability coefficient and other parameters of flax-fiber reinforced silty clay have not been sufficiently studied. In this study, the permeability of flax-fiber reinforced silty clay soaked with zinc-contaminated solution under different osmotic pressure was tested by a flexible-wall permeameter, and the effects of zinc-ion concentration and confining pressure on the permeability of flax-fiber reinforced silty clay were studied. Genius XRF was employed to detect the types and quantity of metal elements in the specimens, thereafter, the reasons for the change of permeability were explained from chemical and microscopic perspective. The results showed that the permeability coefficient of flax-fiber reinforced silty clay decreased significantly with the increase of zinc-ion concentration in a low concentration (about 1–10 mg L−1). While in a high concentration (about 100 mg L−1), the permeability coefficient of flax-fiber reinforced silty clay changed little with the increase of zinc-ion concentration. While the flax-fiber reinforced silty clay was not soaked with zinc-ion solution, the permeability coefficient of the specimen increased with the increase of confining pressure. However, when the flax-fiber reinforced silty clay was soaked with zinc-contaminated solution, the permeability coefficient first decreased and then tended to be constant with the increase of confining pressure. With the increase of confining pressure, the porosity of flax-fiber reinforced silty clay decreased, and with the increase of zinc-ion concentration, the porosity of flax-fiber reinforced silty clay first increased and then decreased.
Highlights
With the application of fiber-reinforcement technology, the mechanical properties of silty clay are improved with fiber reinforcement
The permeability of granular soils was checked through standard permeability test methods by Saghari and Bagheri[15], and they evaluated the influence of polymer-fiber on soil permeability coefficients with different length of fibers. Ma16 carried out a series of laboratory triaxial tests to investigate the fiber reinforcement mechanism, and to study the characteristics of flax-fiber reinforced clay, thereafter, he found that the optimal reinforcement rate for clay was 0.8%
In order to provide a certain solution to the above engineering problems, the permeability coefficient of the flax-fiber reinforced silty clay soaked with zinc-contaminated solution was investigated in this study
Summary
With the application of fiber-reinforcement technology, the mechanical properties of silty clay are improved with fiber reinforcement. Through a series of triaxial compression tests, it was found that the addition of bamboo strips and flax-fiber improved the shear strength of the clay, and the deformation resistance of the clay was improved Those studies provided the experimental basis for investigating the mechanical properties of fiber reinforced soil, and it can be seen that mechanical properties are of great significance for practical engineering. In order to provide a certain solution to the above engineering problems, the permeability coefficient of the flax-fiber reinforced silty clay soaked with zinc-contaminated solution was investigated in this study. The effects of different zinc-ion concentrations and different confining pressure on the permeability of flax-fiber reinforced silty clay were discussed, and the causes of the test results were analyzed from chemical and microscopic perspective
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