Hi all,
Anyone can tell how to make the soil heave due to unloading in the soil (because I need to see the soil heaving due to pile driving in soft clay layers)? how to use plaxis to make the soil heave after the removal of high pressure from the soil?
Load applied
but after load was removed I couldn't get a considerable amount of heave.
Thanks.
Dear Nitharshan,
The heave is not caused by unloading, but because in the reality the pile doesn't replace the soil, but pushes the soil aside and that soil has to go somewhere. For the upper soil the soil will mostly go upwards which is the heave observed.In PLAXIS if a pile is modelled by replacing the soil (change material set from soil to the pile material) there is no side pushing of the soil, hence no heave. To get heave for instance a volume strain should be introduced to model the additional volume (of the pile) that is introduced by driving the pile.
With kind regards,
Dennis Waterman
Dear Mr. Dennis,
Thanks for the reply, can you please explain how to calculate the volume strain if we do pile jacking of pile with D=500mm and per meter length as shown below?
You know the volume of the pile, dV. Make an estimate of the influence zone of the pile and the volume of the influence zone is V. Since the volume of the pile is added to the soil, the volume strain is dV/V.
Noted, thanks.
Dear Mr. Dennis Dennis Waterman
As per your advice, I modeled the soil heave due to pile jacking as shown below.
Please check and let me know if any problems with the modeling.