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<p>Strong uplift pressure under mat foundations of multistorey buildings, caused by high water tables and poor drainage in expansive soils, poses significant challenges in underground construction. Subsurface drainage systems are critical for mitigating these challenges; however, the potential ingress of subsoil particles into drainage networks necessitates strategic filter layer design. This study systematically evaluated filter media performance under uplift pressure using a conventional triaxial cell, combining traditional subsoil compatibility assessments with effective particle size as an additional parameter. The research examined various filter material gradations and their performance characteristics using comprehensive experimental analysis. The results demonstrated that filter materials with smaller effective particle sizes and lower uniformity coefficient (Cu) exhibited superior resistance to uplift pressure compared to alternative gradations. These findings underscore the importance of expanding filter media selection criteria beyond conventional compatibility assessments, advocating for effective particle size as a critical parameter to optimise engineering performance in subsurface drainage systems.</p>

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Performance Analysis of Filter Media Using Triaxial Test Setup: Correlating Effective Particle Size with Uplift Pressure Resistance in Subsurface Drainage Systems

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Arnab Choudhury,
  • Umanath Umaiyan,
  • Biswabikash Rout,
  • V. Govindaraj

摘要

Strong uplift pressure under mat foundations of multistorey buildings, caused by high water tables and poor drainage in expansive soils, poses significant challenges in underground construction. Subsurface drainage systems are critical for mitigating these challenges; however, the potential ingress of subsoil particles into drainage networks necessitates strategic filter layer design. This study systematically evaluated filter media performance under uplift pressure using a conventional triaxial cell, combining traditional subsoil compatibility assessments with effective particle size as an additional parameter. The research examined various filter material gradations and their performance characteristics using comprehensive experimental analysis. The results demonstrated that filter materials with smaller effective particle sizes and lower uniformity coefficient (Cu) exhibited superior resistance to uplift pressure compared to alternative gradations. These findings underscore the importance of expanding filter media selection criteria beyond conventional compatibility assessments, advocating for effective particle size as a critical parameter to optimise engineering performance in subsurface drainage systems.