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Dynamic Response of Pile in Saturated Porous Medium Considering Radial Heterogeneity by Pile Driving
Qiang Li Department of Civil Engineering, Zhejiang Ocean University, China Zhiqing Zhang Urban Planning College, Zhejiang Shuren University, China
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ABSTRACT |
It is well known that the surrounding soil is compacted during pile installation and the compaction region has an important effect on pile dynamic responses. In the present paper, the compaction zone is divided into two stages, namely the stage of soil compaction by pile driving and the one of pore pressure dissipation. At the stage of soil compaction, the excess pore pressure is built up in the compaction zone, after then the excess pore pressure dissipates gradually, it is so-called stage of pore pressure dissipation. Based on analysis of the two stages, a simplified model of pile vertical vibration which can reflect the soil compaction and dissipation of excess pore pressure is established considering the heterogeneous radial zone of soil in the vicinity of the pile disturbed by pile driving. An analytical solution is deduced in frequency domain by means of variable separating method and then a semi-analytical solution is obtained using numerical convolution method. Numerical results from the frequency domain indicate that the equivalent radius of compaction zone has major effect on pile dynamic response, as well as the ratio of exceed pore pressure. It can also be concluded that the actual interaction of pile and soil will be weaken due to the radial zone caused by pile driving, a fact can be deduced that the interaction of pile and soil is overestimated under the ideal undisturbed model. Pile dynamic test of compaction pile should be carried out as soon as possible in order to obtain greater depth of pile test.
Keywords: interaction of soil and pile, pile driving, dynamic response, saturated soil, exceed pore pressure, soil/pile set-up
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