Lateral pressures due to steep slope surcharge
Lateral pressures due to steep slope surcharge
(OP)
We are constructing a steep reinforced slope (1:1) above a vertical concrete retaining wall. I'm having a difficult time determining the additional lateral pressure on the wall due to the steep slope. Rankine, Coulomb, or log-spiral do not work for slope angles greater than phi.
I'd like to determine the additional surcharge load by itself, so I can just add it to the load directly behind the wall using different wall backfill materials.
Please help me find a good reference for this condition. Thank you.
I'd like to determine the additional surcharge load by itself, so I can just add it to the load directly behind the wall using different wall backfill materials.
Please help me find a good reference for this condition. Thank you.





RE: Lateral pressures due to steep slope surcharge
RE: Lateral pressures due to steep slope surcharge
RE: Lateral pressures due to steep slope surcharge
RE: Lateral pressures due to steep slope surcharge
If you have access to or can get the Facum charts via BigH or others, look for this:
Fadum, Ralph "Influence Values for Estimating Stesses in Elastic Foundations" from Proceedings of 2nd Int. Conf, S.M. and Foundation Engineering,Vol. III, pp. 77-84.
Once you have the vertical pressure, factor it to the horizontal by the ususal methods.
Also, my old NAVFAC DM-7.1, on page 166, Figure 2 has formulas for figuring what you have as both horizontal and vertial stresses at points below and off to the side for different embankments configurations.
You may be able to get this from the current NAFAC documents as posted on the Internet. They call your situation Terrace loading. The figure is entitled "Formulas for Stresses in Semi-infinite Elastic foundations". I suspect these are Fadum's charts.
The last I looked at NAVFAC material on the Internet site they had most of the old material from the old book.
RE: Lateral pressures due to steep slope surcharge
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I did not find the charts I mentioned above, but this Figure 11, with the stress distruibution for line loads, ought to work. Divide your earth load into a series of strips and add up the distributions that you get from these, plus your horizontal earth surface pressures.