9.7 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. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves. Eixploratory drill hole 10 m 45 m Saturated clay Sand Figure 9.27

9.7 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. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves. Eixploratory drill hole 10 m 45 m Saturated clay Sand Figure 9.27

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

9.7 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. If an open excavation is to be made
in the clay, determine the safe depth of excavation before the bottom heaves.
Exploratory drill hole
10 m
45 m
Saturated clay Sand
Figure 9.27

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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?
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