In general, wide and deep sheetpiles tend to be more cost-effective than narrow sections because they provide the same bending strength with a lower weight per square foot. As such, with increasing width of sheetpiles sections, fewer sheetpiles are required to cover a certain length of piling operation. Hence, the cost of installation can be reduced accordingly.
However, consideration should also be given to the drivability of steel sections. The larger the surface area of piling sections, the higher the driving force is required. Therefore, the drivability of wide sheetpiles appears to be lower than that of narrow sheetpiles.
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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
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