الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 148 |  |  |
| | | from | 148 | | |
Abstract
Soft clay deposits are spread in different areas in Egypt. Soft clay is considered problematic
soil because of its low strength and high deformation. Various methods are implemented to
improve soft clay-bearing capacities, such as prefabricated vertical drains, sand cushions
reinforced with shredded waste tires, geofoam, lime silica stabilization, stabilization with
fly ash, and stabilization with different chemicals, and stone columns. in this study, the introduction of two kinds of columns were studied. First, columns from slag and cement dust
encased by woven geotextile, and second, columns from bentonite wrapped by a non-woven
geotextile. Four experimental models were implemented for the proposed study. The columns length will be varied between (60%, 80%, and 100%) from the clay bed thickness.
The column’s diameters will be (5.0 cm). Some instruments were used, such as a pore water
pressure sensor to determine the variation in pore water pressure value corresponding to
each load applied, strain gauges to observe the hope strain occurred in geotextile resulting
from the applied load, soil pressure sensor to observe the stress concentration ratio (n) and
LVDT to indicate the settlement occurred corresponding to each applied load. Finally, the
stress–settlement curve will be plotted to determine the improvement ratio in each case. A
numerical model will be constructed using Plaxis 3d program version 2020 to simulate the
clay bed and columns and verify the experimental results with numerical results. The experimental and numerical results show that the slag–swelling soil (bentonite) columns improve
the soft clay-bearing capacity. The results show that the floating columns are better than the
end–bearing columns. The highest improvement ratio is 241.0% with respect to the H/L =
1.0.
Keywords: Slag – Swelling Soil Columns; Bearing Capacity; Ground Improvement; Geotextile; Pore Water Pressure, Soil Reinforcement; Floating columns; Soft Clay.