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Simulation Research on Multi-wave Propagation in Pile Dynamic Testing

Author: LiMengQiang
Tutor: WangXueFeng
School: Huazhong University of Science and Technology
Course: Geotechnical Engineering
Keywords: Pile dynamic testing Loading mode Receiving mode Longitudinal wave Torsional shear wave Defect
CLC: TU473.1
Type: Master's thesis
Year: 2007
Downloads: 90
Quote: 0
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Abstract


Pile integrity testing using stress wave reflection method based on the theory of one-dimensional longitudinal wave , although the method is simple , but very limited ability to solve problems , there is a big difference with social expectations . The stress wave propagation in the pile can be divided into longitudinal wave propagation mechanism of different and exciting ways , reversing the three types of shear waves and bending waves . Torsional shear and bending waves and longitudinal waves , not only the propagation characteristics close to the many ways even better than the pile . In this paper, three-dimensional dynamic simulation study provides several new ideas for pile integrity testing of multi- wave propagation in piles under different loading methods . Stress wave theory , first use the finite element analysis software COMSOL Multiphysics , the premise of ensuring the accuracy of pile dynamic testing process a variety of stress wave propagation characteristics of three-dimensional dynamic simulation analysis . On this basis , the system analyzes the pile complete pile and defects in eccentric vertical knock , the lateral percussion and reverse the top of the pile when struck power response and longitudinal wave receiving eccentric vertical knock solid circle Piles and Piles recommendations , given reasonable load vertical pile torsional shear wave detection and receive . Detection signal by a variety of factors in the pile propagation , detailed analysis of the various parameters of the detection of the complete pile of torsional shear wave signal and explore the defective piles defective axial and radial dimensions , defect location , and other factors that impact on the detection signal . Finally, the longitudinal wave torsional shear wave in the the pile propagation characteristics analysis , longitudinal wave and torsional shear wave in the pile spread differences , and the simulation results contrast with engineering examples , the results show that the recommendations put forward in this paper and the conclusions can be used in engineering practice .

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