Vertical vibration analysis method of large-diameter friction pile in overlaying bedrock foundation

A technology of vertical vibration and analysis method, which is applied in the test of basic structure, basic structure engineering, complex mathematical operation, etc.

Active Publication Date: 2018-12-21
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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  • Vertical vibration analysis method of large-diameter friction pile in overlaying bedrock foundation
  • Vertical vibration analysis method of large-diameter friction pile in overlaying bedrock foundation
  • Vertical vibration analysis method of large-diameter friction pile in overlaying bedrock foundation

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Embodiment Construction

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

[0159] 1.1 Mechanical model and basic assumptions

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

[0163] (2) The ...

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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 transversely isotropic saturated viscoelastic foundation of a lying bedrock, which belongs to the test analysis of foundation engineering Technical field. Background technique [0002] At present, most of the research on saturated soil-pile dynamic interaction is carried out based on the Biot saturated soil medium model. Although Biot theory has been successfully applied in many engineering fields, research shows that its theoretical model has certain limitations and deficiencies. For example, the most obvious is that it is inconsistent with the principle of material objectivity and the second law of thermodynamics, which is controversial. Biot theory's description of the mechanical behavior of porous media is based on intuition. In essence, it is an engineering descrip...

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Application Information

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Patent Type & Authority Applications(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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