Abstract
Laboratory triaxial tests were carried out to investigate the reinforcement mechanism, to study the characteristics of flax fiber-reinforced clay, and to discuss the effect on stress-strain relationship and shear strength parameters of flax fiber-reinforced clay in different flax fiber content and different confining pressure. Respectively, the ratio of fiber content to clay by weight is 0.2%, 0.4%, 0.6%, 0.8%, and 1.0%, and the confining pressure is 100 kPa, 200 kPa, and 300 kPa in triaxial test. The test results show that, the shear strength of flax fiber-reinforced clay is greater than that of pure clay. Compared with the pure clay, the shear strength of flax fiber-reinforced clay increased as the cohesion and friction increased; while the increase of the friction is relatively small, the increase of cohesion is large. The shear strength firstly increased and then reduced with the increase of flax fiber content. When the fiber content was 0.8%, the shear strength reached a peak value, and the shear strength reduced with the further increase of fiber content.
Highlights
Laboratory triaxial tests were carried out to investigate the reinforcement mechanism, to study the characteristics of flax fiberreinforced clay, and to discuss the effect on stress-strain relationship and shear strength parameters of flax fiber-reinforced clay in different flax fiber content and different confining pressure
Ranjan et al [17] carried out triaxial tests on medium and coarse sand reinforced with fiber, and the results show that the peak strength of fiber-reinforced soil is enhanced with the increase of fiber content, and the residual strength is higher than that of plain soil
Yetimoglu et al [18] carried out triaxial tests on fiberreinforced sand, and the results show that the shear strength of fiber-reinforced sand was obviously increased compared with that of nonreinforced sand
Summary
Laboratory triaxial tests were carried out to investigate the reinforcement mechanism, to study the characteristics of flax fiberreinforced clay, and to discuss the effect on stress-strain relationship and shear strength parameters of flax fiber-reinforced clay in different flax fiber content and different confining pressure. Ranjan et al [17] carried out triaxial tests on medium and coarse sand reinforced with fiber, and the results show that the peak strength of fiber-reinforced soil is enhanced with the increase of fiber content, and the residual strength is higher than that of plain soil. Prabakar and Sridhar [9] used sisal fiber to reinforce silty clay; the effects of fiber content, length, and other factors on the strength parameters and compaction characteristics were investigated by triaxial test and compaction test, and the results showed that sisal fiber can effectively increase the maximum deviatoric stress of clay. Anggraini et al [33] took coconut shell fiber as reinforced material, and considered that fiber content is the main factor affecting the strength of reinforced soil. e abovementioned studies show that natural fiber performs good reinforcement effects. e acquisition and selection of natural fibers is mostly based on the ecological environment of the project, and there are many kinds of materials that can be selected locally [34]. ese studies expand the sources and fields of reinforced material; there are relatively few research studies on the behavior of flax fiber-reinforced clay at present
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