n exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and G, = 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 the sand layer.  a. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves.  b. How much is the pressure at the interface of the clay and sand? c. If a factor of safety of 2.0 is to be ensured, how deep should be the excavation from the ground surface?

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and G, = 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 the sand layer. 

a. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves. 

b. How much is the pressure at the interface of the clay and sand?
c. If a factor of safety of 2.0 is to be ensured, how deep should be the excavation from the ground surface?

 

Exploratory drill hole
10 m
6 m
4.5 m
Saturated clay Sand
Transcribed Image Text:Exploratory drill hole 10 m 6 m 4.5 m Saturated clay Sand
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