Piled rafts are an efficient means of supporting structures as the load is not only carried by the piles, but load is transferred to the soil by the raft. In cases where the raft is unevenly loaded, for instance by towers of different heights, longer piles or piles of larger diameter may be required beneath the more heavily loaded part of the raft to stop the foundation from rotation. For tall buildings, any rotation of the foundation can mean that the building will tilt, and this can mean large lateral movements at the top of the structure. In this paper, a finite layer approach is presented that may be used for analysis of piled rafts with different length or diameter piles. The soil may be horizontally layered, and loads on the raft may be vertical or horizontal.
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