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cohesion value
2

cohesion value

cohesion value

(OP)
In a geotech report it is stated that "A cohesion value of 850 psf may be used in front of the key-way along the horizontal distance to the toe in order to resist sliding."

My questions/comments:
This is a retaining wall with a shear key at the base of the footing.  Does this statement mean if the key is 1' from the toe and 1' deep from the base of the footing I get the full 850 psf of resistance from soil in front of the key.

Obviously there are other things to consider here, frost depth, base of footing depth, etc.  but I am looking for what in general this means.  I am currently waiting for the geotech to return my phone call.  Any help is appreciated.

RE: cohesion value

2
Ask the geotech what he meant!

RE: cohesion value

I would think so. What I always done, is ignore a certain overburden say the top 2 feet. Then I would use the key and the footing thickness as part of the Passive(Kh)Force. In NJ the frost line is 3 feet. Check that groundwater is not an issue. Hope this helps.Good Luck.

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