ko for culvert wing wall and bridge winged abutment
ko for culvert wing wall and bridge winged abutment
(OP)
Retaining structures like culvert wing walls and bridge winged abutments are restrained at the base and side which reduce the movement of soil. Therefore should the coefficient of soil presure used be Ko instead of Ka?
Also is there any publication or research paper which relates the coefficient of soil pressure to compaction?
Thanks for any input.
Also is there any publication or research paper which relates the coefficient of soil pressure to compaction?
Thanks for any input.





RE: ko for culvert wing wall and bridge winged abutment
Compaction can induce stress over Ko. For granular materials, Ko is on the order of 0.5. Comapction stresses can raise K to .6 or better. Typically most specifications will require compaction by hand equipment ( walk behind)with in 5 feet of the back of the wall to prevent high stresses.
RE: ko for culvert wing wall and bridge winged abutment
NAVFAC DM7-2 Figure 13 shows induced pressures due to compaction near the wall.
Jeff
RE: ko for culvert wing wall and bridge winged abutment
My point of contention is the development of "ko" for retaining structures. If one consider any bridge abutments, if "ko" does developes, then relieving slab or transition slab is not required as soil settlement will not take place. The soil has achieved "ko".
In normal circumstances, compaction close to retaining wall is some distance away - 1 to 2 ft. At this distance away, the compaction can be at any density. Therefore, it would be very interesting to know the Ko-ka values and this is what I am interested in.
Thanks for any contribution
RE: ko for culvert wing wall and bridge winged abutment
RE: ko for culvert wing wall and bridge winged abutment
RE: ko for culvert wing wall and bridge winged abutment