Determination method of cushion layer thickness in similar model test of cfg pile composite foundation

Abstract

The invention provides a method for determining the thickness of a cushion layer in a similar model test of a CFG pile composite foundation, and relates to the technical field of civil engineering. The four parts of comprehensive judgment and cushion thickness determination are used to determine the thickness of the CFG pile composite foundation cushion under different geological conditions and different pile foundation design parameters, and solve the problem of CFG pile composite foundation cushion materials in similar model tests. The geometric similarity problem can ensure the cooperative work of piles and soil between piles, which is conducive to objectively revealing the bearing characteristics of pile composite foundations, and can safely, economically and rationally design CFG pile composite foundations. Provide conditions to obtain good economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a method for determining the thickness of a cushion layer in a CFG pile composite foundation similar model test. Background technique [0002] Using CFG piles and other rigid piles and semi-rigid piles as a composite foundation scheme to carry out foundation treatment is one of the important methods for dealing with weak foundations in the world's engineering circles. Due to the widespread distribution of weak foundations and the gradual improvement of the bearing capacity of the foundations, the cost of foundation treatment projects accounts for a relatively large proportion of project construction costs. [0003] In the foundation treatment plan of the pile composite foundation, in order to improve the bearing capacity of the foundation soil, the code requires that a certain thickness of sandstone cushion be placed between the top of the pile and the bottom of the fou...

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Problems solved by technology

However, at present, the thickness of the cushion layer in the laboratory model test only considers the geometric similarity condition, and ignores the influence of physical properties such as the cushion layer modulus and Poisson's ratio on the bearing characteristics of the composite foundation, and cannot clarify the CFG pile-pile soil. The core issues of the bearing mechanism, such as the law of load transfer and the coordinated deformation of cushion layer-pile soil-CFG pile, etc.

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