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<p>This paper evaluates Sand Compaction Pile (SCP) and Dynamic Compaction (DC) methods for enhancing soft soil in the Dhaka Mass Rapid Transit (MRT) project. Targeted interventions were required for the stratified soil profile, consisting of liquefiable sand (3–5&#xa0;m thick) over soft clay (SPT ∼5): dynamic compaction for densifying the sand layer and soil-cement piles for stabilizing the underlying clay. Post-treatment Standard Penetration Test (SPT) values indicated that DC significantly improved the sand layer (SPT rose to 15–25) while SCP effectively strengthened the clay (SPT increased to 8–12). The Tongi-to-Uttara section (CP01) simultaneously addressed liquefaction concerns and settlement issues through the integration of both techniques. Field verification confirmed that DC’s high-energy impact (10–23 ton pounders from 6 to 20&#xa0;m height) and SCP’s displacement piles (∅700&#xa0;mm) provided a cost-effective and time-efficientsolution for the dual-layer geotechnical issue. These results underscore the necessity of site-specific, stratified soil improvement methods in megaprojects built on diverse soft soils.</p>

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Implementation of soil improvement techniques in the Dhaka mass rapid transit project a comprehensive case study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月7日

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  • Shoma Hore,
  • Mosharof Al Alim,
  • Maliha Farjana,
  • Monir Hossain,
  • Ripon Hore

摘要

This paper evaluates Sand Compaction Pile (SCP) and Dynamic Compaction (DC) methods for enhancing soft soil in the Dhaka Mass Rapid Transit (MRT) project. Targeted interventions were required for the stratified soil profile, consisting of liquefiable sand (3–5 m thick) over soft clay (SPT ∼5): dynamic compaction for densifying the sand layer and soil-cement piles for stabilizing the underlying clay. Post-treatment Standard Penetration Test (SPT) values indicated that DC significantly improved the sand layer (SPT rose to 15–25) while SCP effectively strengthened the clay (SPT increased to 8–12). The Tongi-to-Uttara section (CP01) simultaneously addressed liquefaction concerns and settlement issues through the integration of both techniques. Field verification confirmed that DC’s high-energy impact (10–23 ton pounders from 6 to 20 m height) and SCP’s displacement piles (∅700 mm) provided a cost-effective and time-efficientsolution for the dual-layer geotechnical issue. These results underscore the necessity of site-specific, stratified soil improvement methods in megaprojects built on diverse soft soils.