An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29%
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Was observed to be under artesian pressure. Water in the drill hole rose to a height of 6 m above the top of sand layer. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves?
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Exploratory drill hole 4.5 m Saturated clay Sand
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