DYNAMIC AND STATIC BEHAVIOUR OF DRIVEN PILES

The rapidly increased use of pile foundations and the appearance of new driving techniques, as well as stress wave measurement equipment have led researchers to look for better understanding of the dynamic and static behaviour of the hammer-pile-soil system and to develop more reliable methods of pile analysis. The reliability of the pile driving analysis is primarily a function of the accuracy of the soil parameters and the rheological model of the soil. The scope of this study is an attempt to find a new soil model and a new computer program for pile driving analysis. The investigation has been focused on the derivation of soil parameters from conventional soil mechanics and soil dynamics. The solution of the stress equation is based on Smith's approach. After remarks on different existing soil models, a new soil model for pile driving analysis is proposed in this research work. The soil parameters can be determined directly from the shear modulus of the soil, material densities, Poisson's ratio, damping ratio and pile dimensions. Influences from installation of the pile, soil inertia, interparticle shear stress, mass of pile, soil type, number of blows count, etc, can be considered in the evaluation of soil stiffness, hysteretic damping, radiation damping and quake. The established guiding computer program SVIDYN can be run in a microcomputer using either the new soil model or smith's soil model. The program can be used to study the bearing capacity and driveability of piles. The program is tested with results from different field tests and parameter studies and compared with capwap analysis and shows the reliability of the new approach for pile driving analysis. The bearing capacity of the piles, force history, velocity history, permanent set, number of blow count and simulation of static load tests can be obtained with the SVIDYN computer program. (Author/TRRL)

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  • Corporate Authors:

    Swedish Geotechnical Institute

    Fack
    S-581 01 Linkoping 1,   Sweden 
  • Authors:
    • Nguyen Truong, T
  • Publication Date: 1987

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Filing Info

  • Accession Number: 00478710
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jan 31 1989 12:00AM