sheet pile wall with sloping dedge line away from wall

[pokeng]

I'm working with a cantilever sheet pile wall retaining ~7.5' of earth. The dredge line immediately in front of the wall is level and stays level for 17' measured perpendicular to the wall. Beyond 17', the dredge line slopes down at 2.5:1 slope away from the the wall. At this distance from the wall, should I expect a reduction in the passive pressures on the sheet pile wall due to the slope?

TIA,
pokeng

 

[Panars]

If the slope breaks beyond the end of the passive soil wedge, then there shouldn't be any reduction in the passive earth pressure. For a retained height of 7.5 feet, I would expect that you would not have any reduction, but it will depend on the depth to the sheet pile toe and the friction angle of the soil.