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A Vertical Vibration Analysis Method of Large Diameter Friction Pile in Underlying Bedrock Foundation

A technology of vertical vibration and analysis methods, which is used in the testing of foundation structures, foundation structure engineering, construction, etc.

Active Publication Date: 2021-03-16
BEIJING UNIV OF TECH
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In the domestic and foreign published patent and non-patent literature retrieved this time, there is no report with the same content as the overall research and development of this project

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  • A Vertical Vibration Analysis Method of Large Diameter Friction Pile in Underlying Bedrock Foundation
  • A Vertical Vibration Analysis Method of Large Diameter Friction Pile in Underlying Bedrock Foundation
  • A Vertical Vibration Analysis Method of Large Diameter Friction Pile in Underlying Bedrock Foundation

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Embodiment Construction

[0158] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0159] 1.1 Mechanical model and basic assumptions

[0160] The dynamic interaction calculation model of saturated soil-pile system is as follows: figure 1 As shown, the length of the pile in the dynamic interaction calculation model of the saturated soil-pile system is L, and the section radius of the pile body is r 0 , the modulus of elasticity is E p , Poisson's ratio is υ p , with a density of ρ p , the viscous damping coefficient is η p , the pile top has a vertical steady-state exciting force f(t)=f 0 e iωt , The thickness of the saturated foundation soil layer is H, f s Indicates the pile side soil reaction force, R p Indicates the soil reaction force at the bottom of the pile.

[0161] The saturated soil-pile system satisfies the following assumptions:

[0162] (1) The soil skeleton around the pile is a transversely isotropic satura...

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Abstract

The invention discloses a vertical vibration analysis method of a large-diameter friction pile in an overlaying bedrock foundation, particularly relates to a vertical vibration analysis method of a large-diameter friction pile in a lower horizontal bedrock transverse isotropic saturated viscoelastic foundation, and belongs to the technical field of foundation engineering test analysis. According to the vertical vibration analysis method, de Boer establishes a porous medium theory based on a continuous medium mixture principle and a volume fraction concept, the volume fraction concept is utilized, a plurality of microscopic properties can be directly described through macroscopic properties, and a complex formula in the theory of hybrid mixtures is avoided; the porous medium theory established by de Boer conforms to the continuous medium mechanical and the thermodynamics principles and also has a lot of advantages which are not achieved in the Biot theory; and therefore, the vertical vibration analysis method can provide the theoretical guidance and reference functions for research of more generalized and more complex soil structure dynamic interaction problems.

Description

technical field [0001] The invention relates to a vertical vibration analysis method of a large-diameter friction pile, in particular to a vertical vibration analysis method of a large-diameter friction pile in a horizontally isotropic saturated viscoelastic foundation of an underlying bedrock, which belongs to foundation engineering test analysis technology field. Background technique [0002] At present, most studies on saturated soil-pile dynamic interaction are carried out based on the Biot saturated soil medium model. Although the Biot theory has been successfully applied in many engineering fields, the research shows that the theoretical model has certain limitations and deficiencies. For example, the most notable is that it is inconsistent with the principle of material objectivity and the second law of thermodynamics, which is controversial. Biot's theory is based on intuition to describe the mechanical behavior of porous media. In essence, it is a method of enginee...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00G06F17/11
CPCE02D33/00G06F17/11
Inventor 许成顺崔春义张石平梁志孟孟坤
Owner BEIJING UNIV OF TECH
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