Retaining Wall
Retaining Wall
(OP)
I'm designing a 20' tall cantilevered retaining wall where the wall will only be 2' away from a very stable vertical hard rock cut. Crushed gravel will be filled in that 2' space. Since the gravel is only a 2' wide, how do I apply the gravel pressure on the wall? I think the typical triangular load pressure would be too conservative for this condition. Hope someone can help me.
Thanks.
Thanks.





RE: Retaining Wall
http://www.eng-tips.com/viewthread.cfm?qid=393062
However, seepage of surface water may come into play some day for you.
Can you install any rock anchors to minimize all the grief with a wide footing for cantilevering support?
RE: Retaining Wall
Soil Engineering by Spangler and Handy, 4th Edition has exactly what you are looking for regarding a rock face. It is not covered in earlier editions though.
Full earth pressure usually occurs to a depth of approx. 2 x space between wall and rock face and then levels off assuming a certain friction between the backfill and rock face.
Note: Rock is never where it is supposed to be and this calculations is totally dependent on the space between wall and rock. If you assume 3 feet and it is actually 5 feet, the pressure calculation is off by quite a bit.
Note 2: some of this may not apply real well in a seismic zone where the pressures may increase due to a reduction in frictional factors.
RE: Retaining Wall
http://www.soilstructure.com/
RE: Retaining Wall
I have used a procedure outlined in a journal article in ASCE's journal of geotechnical engineering.
Frydman, S. and Keissar, I. (1987). "Earth Pressure on Retaining Walls Near Rock Faces," J. Geot. Engrg., ASCE, 113(6), 586-599.
There has also been some good discussion about this subject over the years. Check these threads.
thread486-185817: Retaining Wall 2 ft from Rock: Retaining Wall 2 ft from Rock
thread274-166357: vertical and lateral earth pressure - length req'd: vertical and lateral earth pressure - length req'd
thread507-193368: Parallel Retaining Walls: Parallel Retaining Walls