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Permanent uneven deformation of asphalt car park under portable cabins

Permanent uneven deformation of asphalt car park under portable cabins

Permanent uneven deformation of asphalt car park under portable cabins

(OP)
Cabins have just been installed on an asphalt car park. The portable cabins weigh 4000 kg with 4 no. 300 mm square spreaders under each foot.

The car park is constructed from:
1" thick rolled asphalt
2" thick bitumen macadam
6" thick granular subbase
well compacted ground

The effective pressure on the asphalt is:
4000 kg = 40 kN / (4 × 0.3²) = 111 kN/m²

The question is whether this load is likely to cause permanent deformation of the asphalt leading to problems with ponding of water in the future.

I know this is a complicated question depending on the semi-solid nature of the asphalt and its rheological characteristics. The temperature for the duration of the portable cabins is not expected to exceed 30°C. The cabins are expected to be in place for approximately a month.

Any guidance, rules of thumb or a point in the right direction would be appreciated.

RE: Permanent uneven deformation of asphalt car park under portable cabins

Based on the rheological properties of your particular asphalt, you might get some localized deformation particularly during warm weather, but your contact pressure is not very high

RE: Permanent uneven deformation of asphalt car park under portable cabins

Spread the load with some plates or timbers. Similar to a crane outrigger. You could reduce it by 75% easily

RE: Permanent uneven deformation of asphalt car park under portable cabins

Settlement is not primarily a function of bearing capacity. If you don't know the settlement behavior of the soil under stress they you should assume long term settlement of at least an inch.

RE: Permanent uneven deformation of asphalt car park under portable cabins

You might get some localized deformation particularly during warm weather, but your contact pressure is not very high

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