Cohesion value of 4000 psi concrete.
Cohesion value of 4000 psi concrete.
(OP)
I am doing slope stability analysis for a levee with a I-wall on top of the levee. I need a cohesion value of concrete to perform these calculations.
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Cohesion value of 4000 psi concrete.
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RE: Cohesion value of 4000 psi concrete.
RE: Cohesion value of 4000 psi concrete.
If for some reason, the critical surface is passing through the structure, you will need to run a different analysis either by hand or using a different software package since no slope stablility software is going to give acurate and/or meaningfull results in a situation like that.
RE: Cohesion value of 4000 psi concrete.
RE: Cohesion value of 4000 psi concrete.
RE: Cohesion value of 4000 psi concrete.
I like this method as it forces all failure surfaces around your concrete member, but only if, as you and TDAA mention in your posts, you check for a critical surace through your structure. With most programs inorder to see this you have to *FIRST* model the dike without the concrete. After you do this and design your structure you can shoot the cohesion up.
My concern is that I have seen models where a thin concrete core or surface treatment was used to show factor of safeties 2 or 3 times higher than just earth with no analysis of the internal forces on the concrete facing. Sort of like showing shotcrete as the important part of an MSE wall.
RE: Cohesion value of 4000 psi concrete.
I agree that any structure must be designed for the forces that act on it. However, I do not in general believe that a slope stability program can be used to determine those forces. The exeception is when you have an active slide, i.e. F.S.=1.0. Under those conditions the stability program can be used to determine the forces acting on a stucture being constructed to stabilize the slide.
With respect to your comments about seeing models with a thin layer of concrete and high factors of safety, I have no doubt that you have seen them and that engineers have reported the results. It is hard to just not laugh when someone does that kind of analysis and then REALLY believes the answer that the computer program spits out.
RE: Cohesion value of 4000 psi concrete.
On the other hand, it may be that the strength just doesn't matter, as GPT said. In your case, the I-wall may be so strong that the supporting soil would fail and not the wall, regardless of whether the concrete is 2 ksi or 6 ksi.
It all depends on the geometry.
RE: Cohesion value of 4000 psi concrete.