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On vertical dynamic stability and cross‐section optimization of closed‐ended hollow pile by considering soil compaction effects
Author(s) -
Hu Wentao,
Wang Ning,
Xu Changjie,
Yuan Feng,
Jin Zijie
Publication year - 2018
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.2807
Subject(s) - pile , geotechnical engineering , geology , mechanics , shear modulus , vibration , deformation (meteorology) , compaction , cross section (physics) , stability (learning theory) , materials science , structural engineering , engineering , physics , oceanography , quantum mechanics , machine learning , computer science , composite material
Summary This paper conducts a comprehensive study on the effects of expansion force after pile driving on the vertical vibration of the hollow pile. The initial radially inhomogeneous strain field of soil in disturbed soil region and dynamic shear modulus of remolded soil are constructed by applying the cylindrical cavity expansion method. The equation governing the incremental motion of the soil is consequently deduced on the basis of incremental deformations superposed on an underlying finite deformation. The longitudinal impedance of the top of the pile and the velocity response in frequency and time domains are also numerically studied. The relations between the expansion force after pile driving and the velocity response of the pile with different wall thickness are discussed accordingly. The results suggest that a pile has a better dynamical stability when the characteristics of the section are optimized and interacting force with soil medium gets smaller.