Effect of Nanoclay-Depended Treatment on the Mechanical Behavior of a Collapsible Soil
نویسندگان
1 Civil Engineering Department, Al-Iraqia University, Baghdad, Iraq
2 Civil Engineering Department, University of Kufa, Al-Najaf, Iraq
3 Civil Engineering Department, Al-Iraqia University, Baghdad, Iraq
4 Directorate of Education, Ministry of Education, Najaf, Iraq
5 Civil Engineering Department, University of Kufa, Al-Najaf, Iraq
doi
10.22075/jrce.2025.34865.2151چکیده
The research investigates the effects of adding nanoclay on the shear strength properties of two gypseous sand soils. The soil samples were taken from the cities of Tikrit (55% gypsum) and Al-Najaf (29% gypsum). A direct shear test was used to examine soil specimens in dry conditions and immediately after a saturation procedure. The distributed soil specimens were remolded in the direct shear box to achieve a specific density. The shear speed was 1.0 mm/min. For both soil samples, there are different added nanoclay contents, 0, 2, 5, and 7%. Three levels of normal stress are applied, 25, 50, and 100 kPa on each soil specimen. The results state that there is a significant decrease in the angle of internal friction with saturation for both soil samples due to the gypsum solution in these soils. The resulting saturated F is significantly lower than the reported mean values in the literature. The F is recovered by adding nanoclay content up to 5% worthily. A mathematical model correlates the values of F and the percentage of nanoclay using a regression analysis with restricting gypsum content (29-55%) and nanoclay (≥ 0%) in saturation conditions.
