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Experimental Study on Damping Coefficient of Soli Effect on Quality Detection of Pile

Author: CaoJunWei
Tutor: YuYunYan
School: Lanzhou Jiaotong University
Course: Geotechnical Engineering
Keywords: Reverberation matrix method Indoor model test Half - buried pile foundation Defect Soil damping
CLC: TU473.1
Type: Master's thesis
Year: 2010
Downloads: 85
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Abstract

Pile foundation is widely used in many engineering fields, such as: high-speed railway roadbed engineering, railway bridge engineering, foundation engineering of high-rise buildings, docks and offshore platform engineering and so on. In this paper, the reverberation matrix method and by indoor model test, all buried intact pile of homogeneous soil, half buried in the complete piles and half-buried single defect pile transient response and waveform recognition systems research, and pile - pile soil interaction soil damping and half-buried single defect types of defects and defect location discriminant study. The research topics include: 1. Based on the pile - soil interaction model, the reverberation matrix method obtained lateral soil and pile subsoil to the top of the pile of homogeneous soil in the semi-sinusoidal excitation force, half-buried single defect pile transient fluctuations solution. The results as follows: for different indoor model test and set the relevant parameters, to meet the requirements of different test parameters. Through indoor naked pile to study the impact of of pile damping on the pile top speed wave. Obtained based on the pile - soil interaction model of Pile and pile subsoil as a sand homogeneous Yellow, the top of the pile in the semi-sinusoidal excitation force, the whole buried integrity pile transient fluctuations solution. Furthermore, the use of the the transient fluctuations solution, through theoretical analysis and indoor model test of full buried complete Pile Top speed wave attenuation law; fitting the pile top speed wave time curve, get full buried complete pile side soil and pile the damping factor of the subsoil and analysis of the damping coefficient of variation; finally establish the relationship between time, amplitude ratio and damping, which wholly buried in the the complete pile side soil and pile subsoil damping distribution. Results: pile damping can be ignored, damping test fitting subsoil layers of Pile and pile damping; tests, the Yellow River sand relative compaction corresponding damping and stiffness coefficient, and the indoor model test the actual situation, the recommended value. Based on the pile - soil interaction model obtained Pile with homogeneous collapsible loess, top of the pile, half-buried in the semi-sinusoidal excitation force complete pile the transient fluctuations solution. Indoor model test study Pile with different degree of compaction, pile different depths was half-buried under the the complete pile speed wave attenuation law; fitting the pile top speed wave time curve, half-buried in a complete pile pile side soil damping coefficient and damping coefficient variation analysis; finally establish the relationship between time, amplitude ratio and damping, resulting in a half-buried in a complete pile side soil damping distribution, half buried single defects The quantitative analysis of the pile defect location and defect types provide reliable parameters. The results: the deeper the pile depth of the pile by the stronger the effect of the surrounding soil, the greater the speed of wave energy dissipation; different depths and different degree of compaction pile side collapsible loess damping coefficient tests and stiffness coefficient, a quantitative analysis of soil parameters based on half buried single defect pile defects. Based on the pile - soil interaction model obtained pile subsoil homogeneous collapsible loess or saline soil, top of the pile in the semi-sinusoidal excitation force, complete pile transient fluctuations solution. By indoor model test study pile subsoil in different soil attenuation law the complete pile speed wave in the case of different degree of compaction; curve fitting the pile top speed wave away a complete pile subsoil damping coefficient and analysis of the damping coefficient Finally, the variation; establish the correlation between the time, amplitude ratio and damping, to thereby obtain a complete piles subsoil damping distribution, and provide reliable parameters for the quantitative analysis of a semi-buried single defect pile defect position and defect type. The results: the damping and stiffness coefficient collapsible loess or saline soil in the bottom of the pile, half buried single defect Defect quantitative analysis of soil parameters based on tests. Based on the pile - soil interaction model, and seek of Pile and Pile subsoil sand homogeneous Yellow, pile top, half-buried in the semi-sinusoidal excitation force the single defective piles transient wave solutions. Full buried and half-buried in a complete pile speed wave attenuation law of Pile and pile bottom soil damping distribution, through piles of defect model (widening, necking, segregation) indoor model test to achieve return-ray matrix method theory on the half-buried single defect pile determine the shallow defect location and type of defect. 6 summarizes the full text of the work done and the main results and suggest further research.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
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