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# Pile Group - Science topic

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Questions related to Pile Group

I want Friction pile group efficiency data and I am unable to find anything about it. I want cohesion number of pile adhesion factor etc.?

Dear all,

What are the factors to be taken into consideration when modeling stone columns in FLAC 3D? Are there differences between the modeling of stone columns and piles?

I want to do a three dimensional analysis of pile group in saturated silty sand using results of shaking table test .

I modeled a Disconnected pile raft foundation system,

I used to pile as an embedded beam with plate (raft) both as an elastic material, but I'm not getting enough axial load in a pile. 350kPa loading(uniform) being used. Also, the connection of pile and raft and use of interfaces in the model.

The paper used for reference is attached below, also the plaxis pile.

please help with this, and I'm a student m.tech

Greetings,

I was wondering what is the optimal way to connect the reinforcement at the top of the pile (the part that connects to the raft foundation):

-The pile bars are left straight and connected to the raft?

-Or the bars are bent in 45 degrees and then connected to the raft?

Because I've seen both cases

How to calculate the natural frequency of various pile group systems or natural frequency of a single pile system? Does natural frequency formula for piled raft foundation system hold good for pile group system?

For soil layers, natural frequency is calculated using the formula

**fn = Vs (2n-1)/4H**where, Vs is shear wave velocity of soil and H is the depth of soil layer.

However, how to calculate the natural frequency of a pile group system or a single pile system? Is there any codes available for calculation of natural frequencies like IS 1893 that gives standard formula for calculation of time period of a structure?

Hi everyone;

I have never used the "pile group effect" reduction coefficient in any of my projects where I made a rock socket pile design calculations. Because I know that there is no literature acceptance on this subject, and I think that's the right calculation method to do.

But the government agency that I work with now has asked me to do so. What do you think about this request ? Do you use "pile group effect" in rock socket pile bearing calculations ?

Best regards

Hello. I'm modelling pile group and pile raft in plaxis. I have got pile raft results fine but I'm facing problems in pile group as I need to ignore the interface between cap and soil. What should be the appropriate way of modelling it?

I need papers or just information about the use of t-z curves taking into consideration group effect in pile groups. I've learned Randolph suggest a Zm factor to estimate the increase in the settlements, but I just couldn't find the paper. The t-z curves, from what learned, have orginally come from the offshore industry, and they have some expertise in this subject, I've found much more easily papers related to the group effect in the py curves, the case for laterally loaded piles, but I know there is something in the literature for the case of axially loaded piles, if anyone can help, I appreciate.

I'm investigating group effect in piles with RS Pile. For lateral loads, the software calculates reduction factors for the py curves to take into account the group effect, but for axial loads, the user must input a coeffient himslelf. I'm having dificulties to find how to calculate such coeffient, would anyone recomend me a method or point a direction?

I am going to model a pile group in liquefiable soil. Although this phenomena should be really modeled as a 3D problem, I want to model this problem in 2D state due to simplification. If employing 2D model for this problem is correct, how can I obtain the 3D results from this modelling? In my opinion I guess that I should work on the stiffness of piles. Do you have any suggestion about the equivalent stiffness of pile groups under seismic loads in 2D modeling?

In order to calculate it I consider the influence of the load that the raft carries and the influence of the load that the pile group carries.

I am modelling pile group in plaxis 3D. i have information about soil and pile but no idea about cap.please guide me about properties of cap in plaxis.

What is the difference between free-head pile group and fixed-head pile group?

What is the most effective software for dynamic analysis of "soil-structures" such as piled raft or pile group foundation? Is Flac3D Suitable for that?

A foundation resting on soil reinforced by floating stone or sand columns?

I am trying to simulate the dynamic behavior of a pile group. In my model, pile and soil are modeled by beam and solid elements, respectively.