Method for increasing horizontal bearing capacity of pile foundation by using steel-gravel cylinder structure around pile

Abstract

The invention discloses a method for increasing the horizontal bearing capacity of a pile foundation by using a steel-gravel cylinder structure around a pile. According to the method, the cylinder wall of the cylinder structure penetrates through a pile body and is installed on the top surface of foundation soil, gravel is filled in the cylinder wall, then horizontal external force is applied to the pile foundation so as to enable the pile body to move, and a soil layer below the inclined side of the pile body is compressed to deform at the moment, so that the part, which makes contact with acylinder bottom plate, of the pile body on the other side is separated so as to generate a gap, and the gravel filled in the cylindrical foundation can leak into the foundation soil from the gap. Similarly, loading is performed on the other sides of the pile body, so that soil bodies on the other sides are also subjected to the same effect. The steps are repeated in the piling process, so that shallow poor foundation soil can be replaced by gravel, and the horizontal resistance of the pile foundation is improved. The foundation form provided by the invention has the advantages that a single-pile foundation effectively controls vertical displacement and a cylindrical foundation effectively controls horizontal displacement, the horizontal bearing capacity and the bending bearing capacity ofthe foundation are increased, and the foundation form is particularly suitable for foundations of structures with complex stress such as offshore wind turbines and the like.

Description

technical field [0001] The invention relates to a method for increasing the horizontal bearing capacity of a pile foundation by using an additional steel-crushed gravel cylinder structure around the pile, and the application field is the field of pile foundation bearing. Background technique [0002] In recent years, with the continuous construction of offshore structures, the types of fixed foundations for offshore wind power have gradually increased, mainly including single pile foundations, high pile cap foundations, jacket foundations, gravity foundations and composite tube foundations. More monopile structures are most commonly used due to their simplicity. In order to bear the vertical load such as the self-weight of the wind power structure on the upper part of the foundation, this type of single pile foundation is often tens of meters high. It is usually a steel pile with a large diameter. The pile body is buried deep in the soil, and the vertical bearing capacity is...

AI Technical Summary

Problems solved by technology

However, if the size of the single pile foundation is excessively increased, it will not only increase the amount of materials and affect the cost, but also be limited by the construction equipment during foundation installation, and there will be certain difficulties in specific construction

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