Hi all and Rushan Gizzatullin Dennis Waterman Stefanos Papavasileiou
Sorry if my questions are seemed to be very small things but i need to know the answers that's why i'm asking. My questions are
01. In the multiplier definition, what is the meaning of the amplitude here (as we defined unit load as dynamic load) ? does here amplitude value represents the load which is dropped on the pile to push in ?
02. When interface is provided, what is the purpose of providing interface below (in the sand area), even though there is no pile element?
03. Can't be used embedded beam element or plate for this pile driving work? if so then we can continue the analysis: for example if we are using solider pile deep excavation analysis, we will stimulate the solider pile driving effect and continue the analysis for each excavation phases?
04. In the pile driving phase, the pile is drived all in one go but actual situation is it has been driving step by step, in that case how we can stimulate the analysis as next half of the wave is negative ?
05. The displacement result from the pile driving seemed to the effect is only to base of the pile, but there is disturbances on the adjacent ground also due to driving and vibrations. Why analysis results not given that effect and if we need to see that result how to change the analysis?
Thanks.
Dennis Waterman please reply, thanks.
Dennis Waterman Stefanos Papavasileiou Rushan Gizzatullin anyone please reply as i need it very urgently, Thanks.
Dear Mr. Dennis,
Thanks for the great reply for the questions and sorry for my rush as i didn't know the rule of the forum, Extremely sorry for that again.
For reply 5) could you please tell me in order to check the disturbances of the soil during pile driving what type of model do we need?
(i refer this tutorial exercise to get the understanding of this => I have to model the deep excavation and near that area some utilities there. So i want to check the induced deflection and stresses on them due to sheet pile or soldier pile installation and excavations. So the purpose of my study here is to understand the installation of the sheetpile (not all in one go) using forces and study the ground and utilities effect due to that. That's why i asked those questions above to get some ideas.
Hi,
There are 2 ways to do this...
Note that method 1) is more accurate and realistic, but due to the high deformations close to the pile numerically very difficult to calculate. You may need to do a lot of trial-and-error with the mesh to calculate it. Generally, the mesh elements should not be too small as small elements suffer more from extreme deformation and thus cause more numerical issues.
Method 2) calculates easier, but the accuracy depends highly on how large you chose the influence zone. Both methods are not accurate enough for a class A prediction of the soil behaviour and should mainly be used for a back analysis of for instance the skin friction of the pile due to increased stress levels.
With kind regards,
Dennis Waterman
Noted with thanks
Dear Mr. Dennis Waterman Dennis Waterman
After study the "interface around corner points" (as you mentioned previously), i have one question. 1) To what extend we need to extend the interface element when modelling rigid and soil interactions (as i found this statement in reference manual)?
For the plate soil interactions (i modelled using only 1 soil), what is the reason for sudden high change in the interface effective stress near the base of the plate? if it is not a real case how to eliminate this one?
An extension of 1 (soil) element is enough. More is not a problem, but not needed.
With respect to the high peak stresses, that is usually caused by the soil moving around the tip of the wall.
Noted with thanks, that increase in stress due to the point of rotation in the cantilever sheetpile and that's not come for anchored sheetpile wall.