Abstract
Compared with traditional equal-section pile, the nodular parts of nodular pile expand the contact area between the pile and foundation soil, which can greatly improve the bearing capacity of pile foundation and increase the stability of pile body structure. In this paper, the mechanism of pile-soil interaction in the construction of vortex-compression nodular pile is studied with the purpose of evaluating the compressive capacity of nodular piles. Through the indoor model test and ABAQUS numerical simulation analysis, the compressive characteristics of 12 types of vortex-compression nodular pile are obtained, and the variation rules of the parameters of the compressive characteristics of vortex-compression nodular piles are quantitatively analyzed, including the failure pattern of foundation soil, load-settlement relationship, and load transfer law of vortex-compression nodular piles. The results showed that the compressive capacity of vortex-compression nodular piles has significant advantages over that of traditional equal-section piles. Based on the results of the indoor model test and numerical simulation, the calculation method and formula of the compressive capacity of vortex-compression nodular piles are given by modifying the corresponding calculation formula of traditional nodular piles. The new method and formula are more in line with the actual working conditions and provide theoretical and data support for the further engineering application of vortex-compression nodular piles.
Highlights
In recent years, the number of infrastructures such as large buildings, long-span bridges, highways and high-speed railways, large oil and gas storage tanks, and offshore platforms has increased rapidly, and all of above need to be built on a specific geological condition, which puts forward higher requirements for the design and application of pile foundation
We analyzed the compressive characteristics of twelve kinds of vortex-compression nodular piles based on the model test [12,13,14]; ABAQUS finite element numerical simulation software was used to study the compressive characteristics of nodular piles under the influence of multiple parameter changes so as to optimize the parameter design of engineering piles
P-1 pile is an equal-section pile with the same diameter as that of other nodular piles. e bearing capacity of pile P-2 to P-12 is much larger than that of pile P-1, which indicates that the nodular piles have extraordinary mechanical performance under compressive load compared with equalsection pile
Summary
The number of infrastructures such as large buildings, long-span bridges, highways and high-speed railways, large oil and gas storage tanks, and offshore platforms has increased rapidly, and all of above need to be built on a specific geological condition, which puts forward higher requirements for the design and application of pile foundation. During the initial design and later construction of pile foundation, engineers and technicians have found that the failure of the pile foundation structure is mainly caused by the destruction of foundation soil, and the role of the pile body does not fully play even though the bearing capacity of the pile itself is large. Experimental work can simulate the deformation characteristics and bearing characteristics of the nodular piles under specific working conditions, which is an effective method to study and solve this series of problems. We analyzed the compressive characteristics of twelve kinds of vortex-compression nodular piles based on the model test [12,13,14]; ABAQUS finite element numerical simulation software was used to study the compressive characteristics of nodular piles under the influence of multiple parameter changes so as to optimize the parameter design of engineering piles. By further integrating numerical analysis and experimental work, the calculation method of ultimate bearing capacity of vortex-compression nodular pile was derived
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