Abstract
When the open-ended pile penetrates the soil layer, the resistance generated by the soil plug cannot be ignored. A pile with a full-size pressure sensor installed at pile tip can detect resistance more accurately than a microsensor when the pile penetrates into the soil. In this paper, the pile installed full-size pressure sensor was used for penetration test and the relationship between formation parameters and pile tip force is obtained. Using the solution of the Kelvin problem in infinite space and the plane stress distribution function, the analytical solution of the bearing capacity of the soil plug is derived under the condition that the displacements of the bottom of the pile and the soil plug are consistent. The results show that the ultimate stress of the soil plug is closely related to the pile diameter and pipe thickness. The bearing capacity of the soil plug is closely related to the properties of the soil layer. The analytical solution of the bearing capacity of the soil plug has a linear relationship with the formation parameters SPT and CPT. The analytical solution of the ultimate bearing capacity of the soil plug has been verified by field test data and has a good match with the geometric dimensions of the pile tip and the formation parameters.
Highlights
As one of the deep foundations, piles have the advantages of high bearing capacity [1,2], good stability, small settlement and small environmental impact, and are widely used in construction engineering and marine engineering
The objective of this study is to develop a new analytical solution for exploring relationship between bearing capacity of the soil plug under closed condition with that of properties of soil layers
When the pile tip force breaks through the critical value, the pile foundation quickly penetrates the soil layer
Summary
As one of the deep foundations, piles have the advantages of high bearing capacity [1,2], good stability, small settlement and small environmental impact, and are widely used in construction engineering and marine engineering. The length of the offshore pile foundation often exceeds 100 m, and the diameter can be larger 2 m. Such a super-long and large-diameter pile foundation needs sufficient penetration force to reach the design depth. Piles usually have two forms: open-ended and closed-ended. Open-ended piles are easier to drive to the design depth than closed-ended piles. When the open-ended penetrates, a soil plug will be formed inside the pile [3]. When the soil plug is closed, the open-ended pile behaves to the closed-ended pile [4]. The presence of soil plugs influence the form of pile load transfer [5,6]
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