Question: An exploratory drill hole was made in a stiff saturated clay ( see Figure 9 . 2 1 ) . The sand layer underlying the

An exploratory drill hole was made in a stiff saturated clay (see Figure 9.21). The sand
layer underlying the clay was observed to be under artesian pressure. Water in the drill
hole rose to a height of 12 ft above the top of the sand layer. If an open excavation is to be made in the clay, how deep can the excavation proceed before the bottom leaves?
An exploratory drill hole was made in a stiff

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