Settlement Reducing Piles in Piled Basements and Shafts.pdf

Since the outer piles are permitted to yield then the

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Since the outer piles are permitted to yield, then the stability of the structure may be questioned. That is why it is required to guarantee the stability of the entire structure when settlement reducing piles are considered. So, the load should be shared between the raft and settlement reducing piles. It is claimed that, the ultimate potential and benefits of the settlement reduced piles can be used if the underlying soil is stiff and compressible. Why is the purpose of a pile reducing settlements in piled shafts and basements? When piles with the same length and diameter used to support basements and shafts slabs that carry uniform distributed loads, the deflection of the slab would be like dished shape. At the beginning, the slab would support almost all the applied loads, but as the loading increases, the quantity of loads imposed on the piles increases progressively. The loads exerted on the pile influence those located at the center and consequently central piles would experience greater settlement. Due to the central pile settlement, the applied load would be redistributed through the slab to the stiffer piles around the perimeter and eventually greater loads will be exerted on these piles. It is demonstrated that, after the redistribution of loads, around sixty percent of loads is supported by perimeter piles whereas nearly forty percent of applied loads are carried by central piles.
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