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Join Eng-Tips Forums! Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. Home Forums Geotechnical Engineers Activities Earth retention engineering Forum Structural backfill zone for wall design thread Hello: I am looking for opinons for the location of the structural backfill influence zone for foundation wall or retaining wall design.
I typically recommend eqivelent fluid pressures for open graded material within the influence zone of the wall, ie. For cohesionless material this typically works out to be 30 degrees from vertical, from the base of the wall.
I have seen the influence zone defined as 45 degrees from the edge of the footing. This requires a signiicantly large backfill zone. My question being, is using the 45 degree zone just being conservative or is there a technical justification for this size influence zone. Thanks in advance for any opiions. Rankine earth pressures relate to plane strain stress conditions.
The influence from an isolated load is calculated using Boussinesq or Westergaard equations and influence by the change in vertical stress and Poisson's ratio for the material. Rules of thumb may suggest such a load spread, but even if you are beyond that "envelope" it does not mean there is no influence. Just run the numbers, it's not that difficult. I am interested in the failure plane or failure envelope wrt lateral earth pressures on the wall. I believe the area behind the wall defined by this plane should be backfilled with cohesionless material.
Text book references this plane using the Mohr's Circle based on the phi angle of the material, ie. Thanks for your response Bagger. The Coulomb "failure plane" will lay back more or is flatter for the same situation due to wall friction but will result in a lower calculated pressure. Pick your religion at this point. Both require that the same phi angle material be on both sides of the "failure plane" or "wedge" to provide the assumed frictional resistance from the soil shear strength thus the zone has to be somewhat larger than the failure plane envelope.
Concrete walls commonly use granular material to the rear of the footing as that Retaining Wall Quote Adelaide Key area is excavated and must be backfilled anyways. Keep in mind that there are different measurement points, one for the wall stem or internal pressure and one for external stability pressure back of footing.
If one is just trying to reduce stem pressure, the zone can be smaller than if on is trying to reduce external pressures as well. This is why you may see a wall backfilled with granular material to the rear of the footing and then up at a from that point back to keep all pressures low.
Doctormo Thanks for the response and commentary. The slope from the back of the footing appears Retaining Wall Zones to be the more accurate model for wall backfill regarding lateral pressures.
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Structural backfill zone for wall design Structural backfill zone for wall design Hello: I am looking for opinons for the location of the structural backfill influence zone for foundation wall or retaining wall design. Bagger RE: Structural backfill zone for wall design you are mixing apples and grapes. RE: Structural backfill zone for wall design f-d The influence zone was probably a bad choice of words.
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