a cofferdam constructed of cantilever sheet piling retains soil to a h
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A cofferdam constructed of cantilever sheet piling retains soil to a height of 6.6metres. The soil is uniform and has an angle of internal friction of 30°. Find the depth
to which the piles should be driven, assuming that the full theoretical passive resistance is developed on the embedded length. Determine the minimum penetration depth of the pile to achieve free earth support conditions