Shear Strength of Continuous-Filament Reinforced Sand

The fiber-reinforced soil technique is a method in which discrete fibers or continuous filaments are mixed with soil to improve the shear strength of the composite and to constrain the deformation of reinforced structure. The objective of this study focused on investigating the shear strength of continuous-filament reinforced sand. A series of direct shear tests were performed to examine the shear behavior of reinforced sand. The factors considered in the tests included the content, diameter, and orientation of the fiber reinforcement. The test results show that specimens with reinforcement had higher shear strength than sand alone, in both peak and residual states. It was also found reinforcement could improve the cohesion intercept as well as the friction angle of the composite. However, the increase in friction angle with increasing fiber content was only up to certain content, and thereafter it reduced. Thus, the specimens displayed the best reinforcing effect at an optimum fiber content that varied with the normal stress acting on the specimen. With regard to the diameter of reinforcement, the thinner reinforcement obtained higher resistance than the thicker at the same fiber content. The contribution of the resistance was mainly due to improvement in the apparent cohesion of the specimen. Moreover, fibers orienting perpendicularly to shear plane performed much well than those parallel to the shear plane.

並列關鍵字

Continuous filament ； reinforcement ； sand ； direct shear test ； shear strength

國際替代計量

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