PrimeCivil
Structural
During excavation for construction of a new warehouse building, a deep sanitary manhole was discovered underneath existing asphalt pavement. The manhole is in conflict with a footing for the new building.
I'm looking at relocating the building but don't have much space to play with due to some high voltage electric lines on the opposite side of the building. The warehouse is a PEB which has already been purchased so I cannot adjust the structure of the building or column locations. The site is being built up about 5' with aggregate. It is an area with extremely sandy soils, pretty much all sand and rock, no clay at all (cohesionless). Depth to bedrock is unknown but is likely less than 10' down and there is no surcharge. The footer will be above the invert of the manhole (~15' down). I doubt I will be able to get the building more than 5' from the manhole. I'm concerned about soil pressure on the sides of the manhole and subsequent failure of the manhole wall. I have considered some kind of manhole reinforcement, either mechanical, or by thickening the walls, but think it may be unnecessary.
Does anyone have any experience with this sort of situation or suggestions?
I'm looking at relocating the building but don't have much space to play with due to some high voltage electric lines on the opposite side of the building. The warehouse is a PEB which has already been purchased so I cannot adjust the structure of the building or column locations. The site is being built up about 5' with aggregate. It is an area with extremely sandy soils, pretty much all sand and rock, no clay at all (cohesionless). Depth to bedrock is unknown but is likely less than 10' down and there is no surcharge. The footer will be above the invert of the manhole (~15' down). I doubt I will be able to get the building more than 5' from the manhole. I'm concerned about soil pressure on the sides of the manhole and subsequent failure of the manhole wall. I have considered some kind of manhole reinforcement, either mechanical, or by thickening the walls, but think it may be unnecessary.
Does anyone have any experience with this sort of situation or suggestions?