Experimental Investigation of Stress Relaxation Behavior in Sand and Sand-Geotextile Interface

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Ghaffari Javad; Fazeli Somayyeh

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Journal Paper

Paper Information

Journal: CIVIL INFRASTRUCTURE RESEARCHES Year:2024 | Volume:10 | Issue:1 Page(s): 187-198

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Information Journal Paper

Title

Experimental Investigation of Stress Relaxation Behavior in Sand and Sand-Geotextile Interface

Author(s)

Ghaffari Javad | Fazeli Somayyeh | Issue Writer Certificate

Keywords

stress relaxation

direct shear

sand-geotextile interface

shear speed

shear stress level

Abstract

In this research, the phenomenon of stress relaxation in unreinforced and reinforced sandy soil with geotextile layer has been studied using a large-scale direct shear test. To investigate the effect of shear speed and soil density on the amount of resistance loss due to stress relaxation, two shear speeds of 0.5 and 5 mm/min and two relative densities of 35% and 60%, respectively, loose and medium density, have been used. All samples have been tested in direct shear test under vertical stress of 100 kPa. The results show that the amount of resistance loss due to stress relaxation depends on the shear stress level, soil density, presence of a geotextile layer in the soil and shear speed. In such a way that by increasing the level of shear stress and shear speed and by decreasing the density of sand and also with the presence of a geotextile layer in soil, the amount of resistance loss due to stress relaxation increases.

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