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<p>This study evaluates the effectiveness of deep soil mixing (DSM) for stabilizing salty sand using field trials, laboratory testing, and numerical modeling. DSM columns with a diameter of 0.3 m and a depth of 3.0 m were installed under field-representative conditions, including controlled auger penetration and uniform slurry injection to ensure homogeneity. Visual inspections post-installation confirmed the structural integrity of the columns, showing no signs of cracking or segregation. Unconfined compressive strength (UCS) testing of field cores indicated a logarithmic strength gain, with 49% of the 60-day strength reached within 7 days, emphasizing the importance of curing duration. Bench-scale samples, mixed under controlled conditions, achieved 66% of their 28-day strength in 7 days and exhibited higher UCS than field samples, estimated at 65–75% of laboratory values. Axial loading tests demonstrated significant increases in bearing capacity; notably, a group of four DSM columns provided a 300% increase in capacity compared to a single column. Numerical modeling results aligned with field data, supporting the reliability of predictive tools when calibrated using laboratory and field parameters. These findings confirmed DSM as a robust technique for enhancing the mechanical performance of salty soils, with practical implications for foundation engineering and ground improvement strategies.</p>

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A Field Case Study on Deep Soil Mixing for the Improvement of a Salty Sand

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Mohamed Al-Aghbari,
  • Yahia Mohamedzein,
  • Mohammed Hammad

摘要

This study evaluates the effectiveness of deep soil mixing (DSM) for stabilizing salty sand using field trials, laboratory testing, and numerical modeling. DSM columns with a diameter of 0.3 m and a depth of 3.0 m were installed under field-representative conditions, including controlled auger penetration and uniform slurry injection to ensure homogeneity. Visual inspections post-installation confirmed the structural integrity of the columns, showing no signs of cracking or segregation. Unconfined compressive strength (UCS) testing of field cores indicated a logarithmic strength gain, with 49% of the 60-day strength reached within 7 days, emphasizing the importance of curing duration. Bench-scale samples, mixed under controlled conditions, achieved 66% of their 28-day strength in 7 days and exhibited higher UCS than field samples, estimated at 65–75% of laboratory values. Axial loading tests demonstrated significant increases in bearing capacity; notably, a group of four DSM columns provided a 300% increase in capacity compared to a single column. Numerical modeling results aligned with field data, supporting the reliability of predictive tools when calibrated using laboratory and field parameters. These findings confirmed DSM as a robust technique for enhancing the mechanical performance of salty soils, with practical implications for foundation engineering and ground improvement strategies.