This clay has good bearing capacity and no shrink-swell property.
The tunnel had to be backfilled with concrete to make a proper bearing capacity for the fountain.
However, in order to facilitate this the roller diameter must be decreased, which also decreases the dynamic bearing capacity.
Allowable bearing stress is the bearing capacity divided by a factor of safety.
With that bearing capacity, no piles or caissons are required.
Later, stone and masonry were used for foundation courses, which greatly added to the bearing capacity of the brickwork.
However, concerns about the bearing capacity of the soil prevented that from occurring.
This construction is particularly useful when structural loads are high compared to the natural bearing capacity of the soil.
The larger base diameter allows greater bearing capacity than a straight-shaft pile.
The soil needs to provide adequate bearing capacity and drainage, and help to retain heat.