Abstract
This study uses Steel Slag Coarse Aggregate (SSCA) as a mixture replacement, preamble material to improve soft soils, which is economic, and has good effect environment. Recently, the development and utilization of by-product, waste and recycle materials must be studied and investigated as a source of improved material for soft soils as, an economic and good effect environmental. The study analyzes effects of both replaced mixtures, (SSCA) or (TSCA) on improved soil bearing capacity and expected settlement after verifying the model. Numerical modeling of the one of real store loaded strip using, PLAXIS, 2D, strain deformation behavior to achieve field visible and measured deformations of untreated soft soil. Numerical studies were devolved to investigate geomechanics parameters improved to compare between using (SSCA) or (TSCA) as, replacement mixture. Results demonstrate that using (SSCA) improved compressibility and strength of shallow soft soil layer significantly than using (TCSA) mixture, while (SSCA) improved strip footing ultimate bearing capacity, (UBC), by 84.4% compared with increase of 20.5% when using (TCSA) mixture at the same thickness. In addition, the study highlights the effective (SSCA) replacement thickness ranges between (0.65 ~ 0.80) footing width.
Highlights
Results demonstrate that using (SSCA) improved compressibility and strength of shallow soft soil layer significantly than using (TCSA) mixture, while (SSCA) improved strip footing ultimate bearing capacity, (UBC), by 84.4% compared with increase of 20.5% when using (TCSA) mixture at the same thickness
In this study based on numerical fundamental stress strain model values [9] [10] [11] [12], this study investigate geotechnical parameters mitigating fine soft soils were compared to carry out an effective thickness of different replacement materials used
The result of the experimental modal foundation system was considered natural soft soil case and the soil improved with replacement mixture, (SSCA) or (TCSA) with percentage 50% and its varies replacement thickness, (H/B) = (0.5, 0.65,1.0, 1.5) in numerical analysis with strip footing with width 7500 mm, rested on two cases of replacement
Summary
Using Steel Slag Coarse Aggregate (SSCA) mixed with dry weight of this soil as replacement mixture used to improve soft soils in Egypt is economic and has a good effect on environment. In this study based on numerical fundamental stress strain model values [9] [10] [11] [12], this study investigate geotechnical parameters mitigating fine soft soils were compared to carry out an effective thickness of different replacement materials used. The effects of different parameters in improved saturated fine soft soil to increase its load capacity and reduce its total and differential settlements have been studied and compared. Natural untreated saturated fine soft soil and loaded strip area are simulated on a numerical model for comparison with deformation measured and recorded in the site under surcharge store loading. The numerical analysis is carried out using the well-known software package PLAXIS 2D, version 8.6
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