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<p>Micropiles are widely recognized as an efficient and adaptable foundation system for strengthening and rehabilitating existing structures, particularly in sites with restricted or challenging conditions. Micropiles can significantly improve structural integrity, stiffness, and overall stability when installed around existing footings. Despite their proven effectiveness, limited research has addressed the numerical evaluation of micropile footing systems under varying geometric configurations and soil conditions. This study aims to investigate the behaviour of isolated footings reinforced with micropiles using advanced three-dimensional finite element modelling performed using PLAXIS 3D. A total of 34 footing models were developed and categorized into 12 groups to assess the influence of micropile length, spacing, configuration, footing dimensions, and soil type. The findings demonstrate that the inclusion of micropiles significantly improves footing performance by reducing settlement and increasing load-bearing capacity. Micropile-strengthened footings exhibited a reduction in settlement of approximately 28% in sandy soil and 17% in clayey soil, accompanied by an increase in bearing capacity of 84% in sandy soil and 26% in clayey soil. In addition, reducing the spacing ratio from 1.5 to 0.5 led to an 12% decrease in settlement and a 47% increase in load-bearing capacity in sandy soil. The results highlight the substantial role that micropiles play in enhancing the performance of shallow isolated footings.</p>

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Bearing Capacity Improvement of Shallow Foundations Strengthened by Open Ended Pipe Micropiles

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Walid H. Shalaby,
  • Enas M. Saad,
  • Mohammad Mohie Eldin,
  • Momen M. Ali

摘要

Micropiles are widely recognized as an efficient and adaptable foundation system for strengthening and rehabilitating existing structures, particularly in sites with restricted or challenging conditions. Micropiles can significantly improve structural integrity, stiffness, and overall stability when installed around existing footings. Despite their proven effectiveness, limited research has addressed the numerical evaluation of micropile footing systems under varying geometric configurations and soil conditions. This study aims to investigate the behaviour of isolated footings reinforced with micropiles using advanced three-dimensional finite element modelling performed using PLAXIS 3D. A total of 34 footing models were developed and categorized into 12 groups to assess the influence of micropile length, spacing, configuration, footing dimensions, and soil type. The findings demonstrate that the inclusion of micropiles significantly improves footing performance by reducing settlement and increasing load-bearing capacity. Micropile-strengthened footings exhibited a reduction in settlement of approximately 28% in sandy soil and 17% in clayey soil, accompanied by an increase in bearing capacity of 84% in sandy soil and 26% in clayey soil. In addition, reducing the spacing ratio from 1.5 to 0.5 led to an 12% decrease in settlement and a 47% increase in load-bearing capacity in sandy soil. The results highlight the substantial role that micropiles play in enhancing the performance of shallow isolated footings.