EireChch - This is a question specifically aimed to investigate and understand the difficulties in numerically modelling such a structure, it is not tied to any specific embedded wall design. I am aware of the analytical methods, which I too sometimes use.
Regarding the different models for...
PEinc:
I don't think this is me complicating, it is a problem of practical value to be able to correctly model deformations of any geotechnical structure. Too many times have I seen numerical modeling where the results seem good, but the theory behind them is shaky. It is imperative to know what...
Hi all, please help me understand something.
I'm making numerical calculations of a construction pit with cantilever embedded walls in normally consolidated soil. Let us assume that the largest lateral wall movement will occur at the top of the wall. Now, which constitutive models can/should be...
Hi, I would still use the surface angle. When you have a homogeneous soil layer behind the wall, you calculate one value of Ka which includes the surface angle, and you apply it to all depths. Imagine if you had the same homogeneous layer but you divided it into several "sub-layers" of the same...
Hello, I'm curious to know what approach you would use in the following situation.
Consider you have to design a pile group (vertically loaded) and calculate the bearing capacity and settlement. I know that there are many methods of estimating the group bearing capacity and settlement factors...
@centondollar Could you please expand a little more on the two solutions - one to design the section elastically, and the other to design it plastically with the assumptions that the flanges resist the full bending moment?
In the first case, if I use the elastic section-modulus then I can...
Hi, Eurocode 3 defines that if the design shear force is more than half the design shear resistance, then the combined effect of bending and shear is calculated by considering a reduced design strength. This reduced strength is calculated as fyr = fy × (1-ro). However, this reduction should only...
Hello, I'm using Plaxis 2D to perform fully coupled flow-deformation analyses. The preliminary step (which plaxis does automatically) to the fully coupled analyses is a simple steady state groundwater flow analysis to generate the steady state pore pressures. In my relatively simple models very...
Here is a simplified but representative cross section of one part of the building, with sketched layers. As you can see, the footings are placed all on the same depth, and far below the floor level in some cases. The most concerning part is the footing on the rightmost side because it would mean...
Hello! I'm currently working on this project where a large building is being constructed on a slope. The static calculations have all been done and our job is to design the construction pit. We noticed on the drawings when looking at a cross section down the slope that all the "parts" of the...
Hello!
Me and my colleague are designing a circular shallow foundation for 100 m high wind turbines. We've already done all the stability checks, and are now in the process of designing the required reinforcement. We already did some calculations and found the required reinforcement in the...
Hello!
I need some suggestions, tips and ideas from someone with experience on assessment of underwater footings on rock.
A few days from now I'm going to dive around an old fortress founded on rock. The goal is to assess the condition of the foundations. Since this is the first time I'm...
Hello!
I'm modelling a bracing system for a construction pit. The system consists of 1) beams all around the pit, attached to sheet piles, 2) bracing beams in the corners and 3) one beam that goes across from one side of the pit to the other.
The model is a 2D grid, with joint restraints such...
@avscorreia
Thank you, this is great information!
I wonder though, and I'd like to know, what recommendations do the other standards give and what procedures do engineers from other parts of the world use (I'm from Europe).
Eurocode 1998-5 only mentions that those inertial forces should be...
Hello!
When designing a concrete gravity wall against sliding, overturning and bearing capacity in a seismic design situation by using a pseudo-static analysis, do you take into account the inertial force of the wall, expressed as Fi=W*k (where Fi - inertial force, W - wall self weight, k -...
You might do jet grouting or compaction grouting on a certain raster and at a certain angle like you would with nails or anchors to stabilize the slope. By grouting you can achieve higher strength, higher stiffness while also intersecting the slope and stabilizing it, while also stabilizing...
@fattdad
I did. Sorry but no matter how many times I read it I cannot figure what you wanted to tell me with all that regarding the flow net. Probably I'm missing a connecting piece between my answer and your question. Could you please explain?
@Okiryu
How would you do this? Is there some...
Hello, since there is no forum for rock mechanics I'm posting this question here, hopefully it's the right place.
The question is theoretical. So there is one thing bothering me with the block theory analysed through the stereographic projection method. For reference, I've been reading the book...
Let's see a few scenarios for a soil profile with 2 layers (a sand layer on top of a clay layer) with the water table somewhere down in the clay layer:
If a perched water table forms because of rain and by other means in the sand layer, then you will have positive water pressures inside the...
