Longitudinal vibration analysis method for not-fully-bonded friction piles in layered soil

Abstract

The invention discloses a longitudinal vibration analysis method for not-fully-bonded friction piles in layered soil. Solid piles and virtual soil piles are subjected to same layering according to thelayering situations of soil around the piles and pile bottom soil, meanwhile, it is assumed that the solid piles are each a homogeneous circular elastomer, and continuous displacement and balanced stress at the interfaces of the solid piles and the virtual soil piles are achieved; the soil around the piles and the pile bottom soil are each an isotropic linear viscoelastic body; the upper surfaceof a soil-around-pile layer is a free boundary and has no normal stress and shear stress, the bottom of a pile-bottom-soil layer is provided with a rigid base; and during pile soil system vibrates, small deformation is conducted, the virtual soil piles make complete contact with pile lateral soil, and the solid piles and the contact face of a soil body are in incomplete contact; according to a viscoelastic dynamic theory, a pile-bottom-soil body longitudinal vibration control equation and a soil-around-pile body longitudinal vibration control equation under the condition of axial symmetry areestablished, according to an Euler-Bernoulli rod theory, a virtual soil pile longitudinal vibration control equation and a solid pile longitudinal vibration control equation are established, and the vibration control equations are solved through laplace transformation so as to analyze longitudinal vibration of the friction piles.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a method for analyzing the longitudinal vibration of a non-completely bonded friction pile in layered soil. Background technique [0002] In the aspect of pile-soil interface interaction around the pile, many methods have been used to simplify the pile-soil interface interaction. A series of discrete Winkler spring-damper models to study the longitudinal vibration characteristics of rigid foundations. Although this method is simple, the parameter values ​​depend on experience. Based on this improvement, a plane strain analysis model is proposed to consider the continuity of soil stress and strain along the radial direction of the pile. This model has a certain theoretical basis, but it cannot consider the change of soil depth along the pile. Based on the above considerations, a three-dimensional continuum model of the soil around the pile was developed. This model can consider ...

AI Technical Summary

Problems solved by technology

However, in the case of incomplete bonding in layered soils, there is still a lack of public methods for considering the relative slippage of the pile-soil interface and the wave effect of the pile bottom soil on the longitudinal vibration characteristics of pile foundations.

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