9.4 An exploratory drill hole was made in a stiff saturated clay (see Figure 9.9). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 4 m 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 heaves? Exploratory deill hole G,-2.72 Moisture content w- 35% 6.1m 4 m wnted chu

Structural Analysis
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Chapter2: Loads On Structures
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9.4 An exploratory drill hole was made in a stiff saturated clay (see Figure 9.9).
The sand layer underlying the clay was observed to be under artesian pressure.
Water in the drill hole rose to a height of 4 m 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 heaves?
Exploratory drill hole
G,- 2.72
Moisture content== 35%
6.1m
4 m
E Saturated clay Sand
Transcribed Image Text:9.4 An exploratory drill hole was made in a stiff saturated clay (see Figure 9.9). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 4 m 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 heaves? Exploratory drill hole G,- 2.72 Moisture content== 35% 6.1m 4 m E Saturated clay Sand
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