3d effect for the corner of a retaining wall
3d effect for the corner of a retaining wall
(OP)
I am analyzing the stability of a mechanically stabilized earth wall at a corner where the wall makes a 90 degree turn. The wall face curves outward. I have done the analysis using 2D limit equilibrium software (SLIDE) neglecting the 3D geometry. I have not tried any other 3D software. I wonder how much difference it will make doing the 2D or 3D analysis. Does anyone have some experience on that? Thanks a lot in advance.
RE: 3d effect for the corner of a retaining wall
J
RE: 3d effect for the corner of a retaining wall
RE: 3d effect for the corner of a retaining wall
Also be aware of the grid to grid interfaces at the corner. It is my experience that this does not provide the same strength as the grid with backfill on the top and bottom of it. If it is a sharp bend, consider shifting the grid elevations between the two sides.
RE: 3d effect for the corner of a retaining wall
As to the geogrid/geogrid interface shear strength, we are aware of that. Our construction specification requires 0.5 ft of separation between the grids.
RE: 3d effect for the corner of a retaining wall
For 3D effects, I would expect that the surface area of the resisting surfaces in the immediate vicinity of the outward projecting corner would be greater than for the 2D "inifnite strip foundation" case.
It would be similar, to my thinking, to stresses near the corner of a flexible footing.
J
RE: 3d effect for the corner of a retaining wall
RE: 3d effect for the corner of a retaining wall
I located Taiwan, we ever meet same question as yours. We solve the problem by Plaxis 3D program to realize the different of 2D and 3D effect. Our result indicate the 2D is more conservative than 3D. So we adopt 2D result for designing. But we found another interesting question inside. When we design MSEW, only consider the strength of geogrid at machine direction(MD) and ignore the strength of geogrid at cross machine direction(CD). Some casees show the failure at CD due to difference settlement occure. I think that you might consider the strength of XCD, not only MD strength.
RE: 3d effect for the corner of a retaining wall