In the sheet pile foundation, steel sheet piles are positioned along the four sides of a footing of the spread foundation and combined to it. It is expected that the use of sheet pile can improve the bearing capability of footing sub-ground and increase the resisting force against falling and sliding of foundation.
Therefore, if the foundation is expected to have only intermediate bearing capacity which would be considered as having not enough bearing capacity on the ground like sandy soil and diluvial clay soil with N value of 20 or so, it can have the same or more bearing capacity with this type of foundation.
Sheet pile foundation has been adapted for the intermediate bearing capacity ground and piles are drilled into the deeper layers through the intermediate bearing grounds with effectively utilizing its bearing capacity. The sheet pile foundation can be the reasonable foundation type for these intermediate bearing capacity ground.
At the moment, there are two cases of sheet pile foundation method applied to the railroad structures, which had finished the constructions.
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