Pile foundation dynamic stability analysis and calculation method under action of wave load

A wave load and calculation method technology, applied in the field of geotechnical engineering, can solve complex, computationally intensive, and imperfect problems

Active Publication Date: 2021-01-29
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the research focuses on the analysis of wave erosion and pile-soil interaction, and there are relatively few studies on the dynamics of pile foundations under complex loads.
In actual engineering, regarding the construction of pile foundations in the ocean, the finite element method is generally used for simulation calculations, which has a large amount of calculation and is relatively complicated, and the theoretical research has not yet been perfected.

Method used

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  • Pile foundation dynamic stability analysis and calculation method under action of wave load
  • Pile foundation dynamic stability analysis and calculation method under action of wave load
  • Pile foundation dynamic stability analysis and calculation method under action of wave load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] In this example, a method for analyzing and calculating the dynamic stability of pile foundations under wave loads, a two-parameter foundation model is used instead of the traditional winkler model, and the effects of wave loads and the softening of soil stiffness at the pile side are considered ,Proceed as follows:

[0156] (1) Theoretical analysis and calculation of pile foundation dynamic stability;

[0157] (2) Comparison of analytical solution and finite element simulation calculation results;

[0158] (3) Instability load calculation;

[0159] (4) Parameter sensitivity analysis.

[0160] In this embodiment, the parameters of the pile body are explored, and specific calculation steps are given.

Embodiment 2

[0162] This embodiment is basically the same as Embodiment 1, especially in that:

[0163] In this example, see Figure 1-21 , a method for analyzing and calculating the dynamic stability of pile foundations under wave loads, the specific operation steps of the step (1):

[0164] (1-1) Calculate the resistance of the soil on the side of the pile using the double-parameter foundation method equivalent to a spring, the pile top bears the vertical static load and the vertical simple harmonic load, and the horizontal direction bears the wave load, and the wave force adopts Diffraction theory is used to calculate, and the pile body is scoured at the same time:

[0165] Wave load f on pile side z Calculated as follows:

[0166]

[0167] Among them: ρ is the density of seawater and takes 1030kg / m3;

[0168] g is the acceleration of gravity, take 9.8m / s 2 ;

[0169] H is the wave height;

[0170] L 1 is the wavelength;

[0171] z is water depth, d l Depth of the pile in...

Embodiment 3

[0281] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0282] In this embodiment, a theoretical calculation method for solving the dynamic stability load and parametric resonance frequency of a pile foundation subjected to wave load. The present embodiment adopts pile length l=35m, h=15m, pile diameter D=0.8m, E=3×10 4 Mpa, I=πd 4 / 64,N 0 =1000kN,N t =100cos(θt), in order to consider the extreme situation, the initial wave parameters are H=3m, the L wavelength is 20m, and the wave load frequency is ω=0.2 for calculation and analysis. The calculation model is as follows figure 1 shown.

[0283] Specific calculation steps:

[0284] (1) Firstly, the wave load f z The calculation of is calculated by using the diffraction theory:

[0285]

[0286] ρ is 1030kg / m3 for the density of seawater;

[0287] g is the acceleration of gravity, take 9.8m / s 2 ;

[0288] H is the wave height;

[0289] L 1 is the wavelength...

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Abstract

The invention discloses a pile foundation dynamic stability analysis and calculation method under the action of a wave load, which comprises the following steps: sorting to obtain a Mathieu equation in a non-homogeneous form, and solving to obtain a critical frequency and an unstable load of parameter resonance; verifying the correctness of theoretical derivation by comparing an analytical solution with a calculation result of finite element simulation. Calculation result analysis shows that the pile top load P0 and the pile body water entry depth have great influence on the instability load,but the instability load is also influenced by the resonance frequency; the influence of the pile side soil body resistance coefficient m on the parameter resonance frequency is maximum, the instability frequency of parameter resonance is rapidly increased along with the increase of m, the stability of the pile body can be effectively improved, and the relative influence of the pile body mass M and the soil body shearing rigidity G on the instability frequency of the pile body is small and cannot be ignored; influences of factors such as pile diameter, wavelength and wave height on amplitude are different and can be adjusted according to specific engineering practice, so that the stability of a pile body is improved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for analyzing and calculating pile foundation dynamic stability under wave load. Background technique [0002] At present, domestic and foreign studies on the dynamic stability analysis of pile foundations subjected to wave loads in the ocean are rarely reported. Most of the research focuses on the analysis of wave erosion and pile-soil interaction, and there are relatively few studies on the dynamics of pile foundations under complex loads. In actual engineering, regarding the construction of pile foundations in the ocean, the finite element method is generally used for simulation calculations, which has a large amount of calculation and is relatively complicated, and the theoretical research has not yet been perfected. In recent years, there have been more and more buildings in the ocean, various sea-crossing bridges, wind power monopile f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/13G06F111/10G06F111/04G06F119/14
CPCG06F30/13G06F30/23G06F2111/04G06F2111/10G06F2119/14
Inventor 张震徐旭姚文娟程泽坤丁刚
Owner SHANGHAI UNIV
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