Method and device for obtaining pile-soil bearing ratio of composite foundation

Abstract

The invention discloses a method and device for obtaining the pile-soil bearing ratio of a composite foundation. The method comprises the steps that basic parameters for calculating the pile-soil bearing ratio of the composite foundation are drawn up; establishing a three-dimensional finite element model of the composite foundation according to the prepared basic parameters; the additional axial force of the pile top elevation cross section of the concrete pile is solved; the additional axial force of the pile top elevation cross section of the inter-pile soil is solved; and according to the additional axial force of the pile top elevation cross section of the concrete pile and the additional axial force of the pile top elevation cross section of the soil between the piles, the pile-soil bearing ratio of the composite foundation is calculated, and the pile-soil bearing ratio of the composite foundation is determined. According to the method, a mechanical model of the composite foundation is established by adopting a three-dimensional finite element method, the stress diffusion effect of soil between piles and the stress transfer rule of concrete piles are simulated according to the load level of the foundation, and a more accurate pile-soil bearing ratio calculation result is obtained through three-dimensional finite element numerical analysis.

Description

technical field [0001] The invention relates to a method and a device for obtaining the pile-soil bearing ratio of a composite foundation, belonging to the technical field of foundation treatment. . Background technique [0002] Composite foundation is a widely used type of foundation treatment. The basic principle of strengthening the foundation is that part of the soil in the natural foundation is artificially reinforced or replaced, or reinforcement materials are placed in the natural foundation. The composite foundation is made of natural The two parts of the foundation soil and the reinforcement jointly bear the upper load, and the bearing performance and settlement control are better. The most common type in engineering is the composite foundation with vertical reinforcement. There are three types of vertical reinforcement composite foundation: bulk material pile composite foundation, flexible pile composite foundation and rigid pile composite foundation. Due to the ...

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Problems solved by technology

This method stipulated in the code ignores the influence of factors such as stress diffusion effect, pile length effect, load level, etc., and the calculation error is large

Due to the complexity of the force transmission mechanism, in the existing research on the bearing capacity of composite foundations, there is no method that can effectively calculate the pile-soil bearing ratio of composite foundations.

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