Question: An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and Gs = 2.68 (Figure 9.27). The sand

An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and Gs = 2.68 (Figure 9.27). The sand layer underlying the clay

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?

Exploratory drill hole 4.5 m Saturated clay Sand

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