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<p>A hybrid system of Sand Compaction Piles and Prefabricated Vertical Drains was used to enhance the ground performance of a MRT depot site in Dhaka, Bangladesh. PVDs were positioned up to a depth of around 21&#xa0;m with 1.5&#xa0;m triangular spacing to accelerate the consolidation of soft clay layers, while 700&#xa0;mm diameter SCPs were constructed to boost liquefaction resistance up to a depth of around 5&#xa0;m with 1.5&#xa0;m square spacing and also up to a depth of around 24&#xa0;m with 2.12&#xa0;m square spacing to strengthen the very soft to medium stiff clay layers. The preload height of the embankment ranged from 3 to 4&#xa0;m. Asaoka and Hyperbolic observational approaches were employed to estimate the final settlement. The expected eventual settlements in the PVD-treated zone and the SCP-treated zone were approximately 666&#xa0;mm and 378&#xa0;mm, respectively. A peak ground acceleration of 0.31&#xa0;g and an earthquake magnitude of 7.5 were used to calculate the liquefaction potential. Prior to the ground improvement, factors of safety against liquefaction ranged from 0.2 to 0.5, indicating high susceptibility; however, post-treatment conditions showed a significant improvement with factors of safety above 1.0. Three-dimensional finite element analysis was utilized to predict the consolidation behavior and staged embankment construction. Numerical predictions and field observations corresponded reasonably well, with settlement variations of about 2–4% and disparities between numerical and expected ultimate settlements of about 13–14%. The improved ground showed effective load sharing with stress concentration ratios between 3.6 and 4.6.</p>

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Performance Assessment of a MRT Depot Area Using SCP and PVD

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Mahabub Sadiq,
  • Paromita Datta Ray,
  • Mushfika Ansary,
  • Md Rizwane Muztaba Khan,
  • Kanij Nayema,
  • Mehedi Ahmed Ansary

摘要

A hybrid system of Sand Compaction Piles and Prefabricated Vertical Drains was used to enhance the ground performance of a MRT depot site in Dhaka, Bangladesh. PVDs were positioned up to a depth of around 21 m with 1.5 m triangular spacing to accelerate the consolidation of soft clay layers, while 700 mm diameter SCPs were constructed to boost liquefaction resistance up to a depth of around 5 m with 1.5 m square spacing and also up to a depth of around 24 m with 2.12 m square spacing to strengthen the very soft to medium stiff clay layers. The preload height of the embankment ranged from 3 to 4 m. Asaoka and Hyperbolic observational approaches were employed to estimate the final settlement. The expected eventual settlements in the PVD-treated zone and the SCP-treated zone were approximately 666 mm and 378 mm, respectively. A peak ground acceleration of 0.31 g and an earthquake magnitude of 7.5 were used to calculate the liquefaction potential. Prior to the ground improvement, factors of safety against liquefaction ranged from 0.2 to 0.5, indicating high susceptibility; however, post-treatment conditions showed a significant improvement with factors of safety above 1.0. Three-dimensional finite element analysis was utilized to predict the consolidation behavior and staged embankment construction. Numerical predictions and field observations corresponded reasonably well, with settlement variations of about 2–4% and disparities between numerical and expected ultimate settlements of about 13–14%. The improved ground showed effective load sharing with stress concentration ratios between 3.6 and 4.6.