Response Of A Pile To Vibratory Driving Using Hypoplastic Model And Fem

The high frequency hydraulic vibratory hammer is a new type ofenvironmental-friendly pile-driving machine. This vibratory driving technique hasbeen preferred to other driving techniques as an efficient, economical andenvironmentally safe means to install piles and sheet-piles into the ground.So it iswidely used in civil engineering, ocean engineering, harbor construction and brigefoundation.However, the theories of the vibratory pile driving was behind thepractical using, which were result in the lower exertion of its full potential.For the high-frequency vibration pile-driving research, there were experimentalmethods and numerical analysis of two kinds. This paper studied the of the numericalmodel of the pile-driving which using the high-frequency hydraulic vibratory hammer.The VIPERE model can neither calculate the penetration speed during the drivingdirectly, nor obtain the impact on the surrounding environment.Thus the papercompiled the program of VIPERE model using Visual Fortran based on the researchof Holeyman and Vanden Berghe.The first section introduced the concept of hypoplasticity and described thehypoplastic constitutive equation developed by Bauer (1996)&Gudehus (1996). andthe model by specifying the assumptions relative to the pile and the soil behaviourwas alsodescribed. The equations used to evaluate the soil resistance along the pileshaft and at the pile base, and the procedure of integration the motion equation.Compiled the program of VIPERE model using Visual Fortran from the equation.The next chapter will compare results provided by the model with measurementperformed during a real vibratory driving. The purpose is to assess its generalcredibility in regards to the field reality.Then it would presented in detail of a typicalsimulation of pile driving. The evolution of the stresses along the shaft and at the pilebase will be presented, and the influence of each step of the integration procedure willbe discussed. In addtion,it would also presented how the model is able to predict theparticles velocities around the pile.Compared the results provided by the model withthe program during the typical simulation of pile driving,these results confirm the validity of program made in the previous paragraph.A parametrical analysis will be also performed to evaluate the sensitivity of themodel to the different parameters governing it,and to guide the application ofpractical engineering.Finally, the high-frequency vibration pile-driving were modelled using thedynamic analysis section of the geotechnical engineering analysis software PLAXIS8.2. To do a brief dynamic analysis of the displacement,the stress field, thedistribution of excess pore water pressure during the pile driving, and make a mutualauthentication and comparison with the previous model.