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<p>The behaviour of X-section cast-in-place concrete (XCC) piles in clay soils under compressive loading is evaluated using PLAXIS 3D V20.Three fundamental dimensional characteristics are examined, including pile length-to-diameter ratio (Lp/Dp), open arc spacing and diameter (ap/dp), and degrees of angle (θ), based on clay soil cohesions (Cu = 70, 100, 150 kN/m<sup>2</sup>). In addition to that, vertical load which conventional piles could carry XCC piles managed to show a twofold increase in comparison. The discrepancy may be attributed to different testing conditions or parameters, such as soil cohesion or pile geometry. Clarification of the specific conditions under which the twofold increase was observed would help reconcile these findings and provide a more accurate representation of XCC pile performance. It has been shown that XCC piles deliver 1.4 times stronger bearing capacity than traditional circular piles when Lp/Dp equals 16 and θ equals 120°. When subjected to equivalent conditions, unequal circular-compressed piles demonstrated twice the vertical resistance strength compared to standard circular piles. Under Cu = 150 kN/m<sup>2</sup>, XCC piles exhibited an ultimate capacity of 6000 kN, representing a 33.3% better performance compared to circular piles, which reached 4500 kN. It has been confirmed that XCC piles provide exceptional deep foundation performance in clay soils by delivering increased stability, decreased settlement, and enhanced nonlinear soil reaction capabilities. Valuable knowledge has been contributed to geotechnical engineering through the research outcomes, which offer specific design recommendations for optimal pile execution under complex ground conditions.</p>

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Performance of XCC piles in clay soil subjected to compression loads: numerical study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月21日

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  • Waseim Ragab Azzam,
  • Ahmed Mohamed Nasr,
  • Ahmed Farouk Abdel-Kader,
  • Hamas Mohab Abo El-Ella,
  • Samir Sabry Salah

摘要

The behaviour of X-section cast-in-place concrete (XCC) piles in clay soils under compressive loading is evaluated using PLAXIS 3D V20.Three fundamental dimensional characteristics are examined, including pile length-to-diameter ratio (Lp/Dp), open arc spacing and diameter (ap/dp), and degrees of angle (θ), based on clay soil cohesions (Cu = 70, 100, 150 kN/m2). In addition to that, vertical load which conventional piles could carry XCC piles managed to show a twofold increase in comparison. The discrepancy may be attributed to different testing conditions or parameters, such as soil cohesion or pile geometry. Clarification of the specific conditions under which the twofold increase was observed would help reconcile these findings and provide a more accurate representation of XCC pile performance. It has been shown that XCC piles deliver 1.4 times stronger bearing capacity than traditional circular piles when Lp/Dp equals 16 and θ equals 120°. When subjected to equivalent conditions, unequal circular-compressed piles demonstrated twice the vertical resistance strength compared to standard circular piles. Under Cu = 150 kN/m2, XCC piles exhibited an ultimate capacity of 6000 kN, representing a 33.3% better performance compared to circular piles, which reached 4500 kN. It has been confirmed that XCC piles provide exceptional deep foundation performance in clay soils by delivering increased stability, decreased settlement, and enhanced nonlinear soil reaction capabilities. Valuable knowledge has been contributed to geotechnical engineering through the research outcomes, which offer specific design recommendations for optimal pile execution under complex ground conditions.