Determining method for thickness of cushion in CFG pile composite foundation using similar model test

Abstract

The invention provides a determining method for the thickness of cushion in a CFG pile composite foundation using a similar model test, and relates to the technical field of civil engineering. The determining method comprises four parts of determining the geometric similarity ratio of the cushion, calculating the physical and mechanical parameters of a cushion similar material, carrying out the comprehensive judgment on similar conditions and determining the thickness of the cushion, the determining method is used for determining the thickness of the cushion in CFG pile composite foundations under different geological conditions and different pile foundation design parameter conditions, the problems of cushion materials and geometric similarity in the CFG pile composite foundation in the similar model test are solved, cooperative work of piles and soil between the piles can be guaranteed, the bearing characteristics of the pile composite foundation can be objectively revealed, the CFGpile composite foundation is safely, economically and reasonably designed, conditions are provided for safely, economically and reasonably designing the CFG pile composite foundation, and therefore good economic benefits and social benefits are obtained.

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...

AI Technical Summary

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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