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

Document Type : Original Article

Authors

1 , Assistant Professor, Department of Civil Engineering, Marand Technical Gollege. University of Tabriz, Tabriz, Iran.

2 Assistant Professor, Department of Fundamental Sciences, Marand Technical Gollege. University of Tabriz, Tabriz, Iran.

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.

Keywords

Main Subjects

References

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