PSI - Issue 70

Md Azhar et al. / Procedia Structural Integrity 70 (2025) 199–206

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(1) Testing on unreinforced soil was carried out. (2) A geotextile was then laid in the centre of the soil sample. (3) Geotextile in two layers were laid at depths of H/3 and 2H/3 from the top. (4) Geotextile in triple layer were placed at depths of H/4, H/2, and 3H/4 from the top, as depicted in Fig 2.

Fig 2. Reinforcement Pattern of sand specimen.

The cylindrical samples were prepared under the conditions of a relative density of 60%. After each layer was compacted and leveled, it was placed horizontally, as well as the reinforcement layer, inside the specimen using a vacuum pump. Unconsolidated undrained triaxial tests were done on the sand sample as per IS: 2720 (part-II)-1993 The aim of this laboratory investigation was to analyze the stress-strain response of specimens of soil in both unreinforced and reinforced conditions using triaxial compression tests. 3. Results and Discussions 3.1. Stress-strain behavior of reinforced sand The aim of this laboratory investigation was to analyze the stress-strain response of specimens of soil in both unreinforced and reinforced conditions using triaxial compression tests." Three-dimensional testing method becomes inevitable for an accurate assessment of strength characteristics of soil samples that would yield consistent and reliable test results. Undrained and unconsolidated (UU) triaxial compression tests were performed on cylindrical samples of soil measuring 100 mm in diameter and 200 mm in height, to evaluate both un-stabilized and stabilized soil behavior. Reinforcement in this investigation involves layers of jute geotextiles which were progressively added to a soil sample in varying quantity. The triaxial tests were carried out under three levels of confining pressure: 0.5 kg/cm², 1.0 kg/cm², and 1.5 kg/cm² to understand the effect of confining pressure on the soil response in triaxial tests. Layering of geotextiles was carefully applied on the soil specimen by placing them in between sand grains so the effect of the layers within the sand sample could be assessed with respect to strength characteristics and deformation behavior. Here, "reinforcement layer" means, the inclusion of jute geotextiles within the sand specimen. The set of experimental observations has been then plotted with graphs showing the stress-strain responses of sand samples under differences in testing conditions. Figs 3, 4 and 5 distinguishably show the stress strain response behavior of reinforced sand samples subjected to failure stresses of 0.5 kg/cm², 1.0 kg/cm² and 1.5 kg/cm² respectively. The strength increase observations provide some insight into how effective the jute geotextile reinforcement proves to be in reinforcing sandy soils under three-dimensional loading.