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<p>This study investigated the monotonic shear behavior of low-plasticity silt under low confining pressures and varying overconsolidation ratios (OCRs). Consolidated undrained triaxial tests were performed on specimens prepared by slurry deposition with OCR values of 1, 3, and 5 and confining pressures between 40 and 100&#xa0;kPa. Strict procedures were followed to ensure specimen uniformity, full saturation, and consistent consolidation, thereby maintaining reliability despite the limited dataset. The results showed that variations in OCR at low confining pressures did not affect maximum pore pressure generation or undrained shear strength. Ladd’s <i>m</i> parameter was unusually low (0.42), indicating reduced sensitivity to stress history under these conditions. No shear bands formed in any specimen, confirming that shear banding was suppressed under low confinement and overconsolidated states. The potential for static liquefaction increased with decreasing confining pressure, as all specimens experienced a temporary loss of effective stress. These findings revealed a behavioral regime in which the mechanical role of OCR diminished as confinement approached the lower bound of practical stress ranges. The results provide insights into geotechnical design and modeling of shallow foundations and embankments on low-plasticity silts.</p>

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Undrained Shear Behavior of Reconstituted Low-Plasticity Silt Under Low Confinement: Revisiting the Role of Overconsolidation

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Phuriwit Jaikaew,
  • Peerapong Jitsangiam,
  • Yu Qian,
  • Pongsakorn Wongchana,
  • Yuanjie Xiao

摘要

This study investigated the monotonic shear behavior of low-plasticity silt under low confining pressures and varying overconsolidation ratios (OCRs). Consolidated undrained triaxial tests were performed on specimens prepared by slurry deposition with OCR values of 1, 3, and 5 and confining pressures between 40 and 100 kPa. Strict procedures were followed to ensure specimen uniformity, full saturation, and consistent consolidation, thereby maintaining reliability despite the limited dataset. The results showed that variations in OCR at low confining pressures did not affect maximum pore pressure generation or undrained shear strength. Ladd’s m parameter was unusually low (0.42), indicating reduced sensitivity to stress history under these conditions. No shear bands formed in any specimen, confirming that shear banding was suppressed under low confinement and overconsolidated states. The potential for static liquefaction increased with decreasing confining pressure, as all specimens experienced a temporary loss of effective stress. These findings revealed a behavioral regime in which the mechanical role of OCR diminished as confinement approached the lower bound of practical stress ranges. The results provide insights into geotechnical design and modeling of shallow foundations and embankments on low-plasticity silts.