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<p>A series of 1<i>&#xa0;g</i> physical stress-controlled static model testing was conducted on an embankment of height 150&#xa0;mm resting on soft clay reinforced with basal reinforcement and Soil Cement Column (SCC). Four cases namely (i) case <i>A</i>: unreinforced (UR), (ii) case <i>B</i>: basal geotextile reinforced (BGR), (iii) case <i>C</i>: column supported (CS), and (iv) case <i>D</i>: basal reinforced column supported (BRCS) were considered to understand the effect of basal reinforcement and SCC on strengthening of the soft clay. A fabric representing geotextile with a tensile strength of 1.8 kN/m and pre-casted instrumented SCCs of a diameter of 40&#xa0;mm and length of 450&#xa0;mm at 100&#xa0;mm center-to-center distance were installed under the embankment and in soft soil foundation respectively. It is found that the inclusion of basal geosynthetic reinforcement along with the SCC (case <i>D</i>) increases the applied stress-carrying capacity of the embankment by 485% compared to case <i>A</i> corresponding to the 50&#xa0;mm settlement. The basal geosynthetic reinforcement reduces the vertical stress on the soft foundation soil under the embankment by tension membrane effect by about 80% for case <i>D</i> as compared to case <i>A</i>. The stress concentration ratio (SCR) at top and bottom of the column for case <i>D</i> increased by 35% and 43%, respectively as compared to case <i>C</i>. The failure and deformation pattern of the embankment and foundation soft soil are also established from the particle image velocimetry (PIV) analysis.</p>

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Performance Assessment of Embankments Supported by Soil Cement Columns with Basal Reinforcement

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Sujata Fulambarkar,
  • Debtanu Seth,
  • Bappaditya Manna,
  • J. T. Shahu

摘要

A series of 1 g physical stress-controlled static model testing was conducted on an embankment of height 150 mm resting on soft clay reinforced with basal reinforcement and Soil Cement Column (SCC). Four cases namely (i) case A: unreinforced (UR), (ii) case B: basal geotextile reinforced (BGR), (iii) case C: column supported (CS), and (iv) case D: basal reinforced column supported (BRCS) were considered to understand the effect of basal reinforcement and SCC on strengthening of the soft clay. A fabric representing geotextile with a tensile strength of 1.8 kN/m and pre-casted instrumented SCCs of a diameter of 40 mm and length of 450 mm at 100 mm center-to-center distance were installed under the embankment and in soft soil foundation respectively. It is found that the inclusion of basal geosynthetic reinforcement along with the SCC (case D) increases the applied stress-carrying capacity of the embankment by 485% compared to case A corresponding to the 50 mm settlement. The basal geosynthetic reinforcement reduces the vertical stress on the soft foundation soil under the embankment by tension membrane effect by about 80% for case D as compared to case A. The stress concentration ratio (SCR) at top and bottom of the column for case D increased by 35% and 43%, respectively as compared to case C. The failure and deformation pattern of the embankment and foundation soft soil are also established from the particle image velocimetry (PIV) analysis.