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<p>In this study, vertical stress readings taken at −&#xa0;15 and −&#xa0;25&#xa0;cm elevations of 40 model tests performed for two different foundations in two different relative densities of % 50 and % 85. Model tests differ in four conditions such only raft plate, only piles, piled raft with embedded plate and not embedded one. As a reference test condition one only raft system, is compared with the elastic methods in literature and the mentioned other conditions. It is found that situation one only raft model test results differ from elastic methods as a value, between % 110 and % 257 and between situation two piled raft systems % 482. Those four different conditions behave different, below the foundation in equivalent raft area where vertical stress increment occurs during loading, when structural material evaluated individually. Espeacilly, piles collects vertical stress at the area around the pile tip where it differs from only raft plates as stress bulbs below the foundation, and vertical stress increment gets in lower value compared to only raft system. When the foundation geometry&#xa0;dimensions gets high, vertical stress also gets lower for the same load level. A new formula with more parameters includes the rigidity of soil and structural elements of foundation should be developed for the raft pile systems to define the vertical stress increments and behaviour below the foundation. And raft contribution to load and settlement capacity of piled raft systems should not be ignored.</p>

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Investigating The Vertical Stress Effect On The Piled Raft Foundations In Cohesionless Soil

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Ercan Egemen Başar,
  • İlyas Devran Çelik,
  • Soner Uzundurukan

摘要

In this study, vertical stress readings taken at − 15 and − 25 cm elevations of 40 model tests performed for two different foundations in two different relative densities of % 50 and % 85. Model tests differ in four conditions such only raft plate, only piles, piled raft with embedded plate and not embedded one. As a reference test condition one only raft system, is compared with the elastic methods in literature and the mentioned other conditions. It is found that situation one only raft model test results differ from elastic methods as a value, between % 110 and % 257 and between situation two piled raft systems % 482. Those four different conditions behave different, below the foundation in equivalent raft area where vertical stress increment occurs during loading, when structural material evaluated individually. Espeacilly, piles collects vertical stress at the area around the pile tip where it differs from only raft plates as stress bulbs below the foundation, and vertical stress increment gets in lower value compared to only raft system. When the foundation geometry dimensions gets high, vertical stress also gets lower for the same load level. A new formula with more parameters includes the rigidity of soil and structural elements of foundation should be developed for the raft pile systems to define the vertical stress increments and behaviour below the foundation. And raft contribution to load and settlement capacity of piled raft systems should not be ignored.