An exploratory drill hole was made in a saturated stiff clay having a water content of 32%. It was observed that the sand layer underlying the clay was 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. ground surface exploratory drill hole Šaturated clay. 8m =32% G=2.70 4m- B. Sand 3m. a) Determirne the void ratio of clay. b) Determine the saturated unit weight of clay. c) How deep can the excavation proceed before the bottom of the saturated clay heaves or when its effective stress is zero.
An exploratory drill hole was made in a saturated stiff clay having a water content of 32%. It was observed that the sand layer underlying the clay was 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. ground surface exploratory drill hole Šaturated clay. 8m =32% G=2.70 4m- B. Sand 3m. a) Determirne the void ratio of clay. b) Determine the saturated unit weight of clay. c) How deep can the excavation proceed before the bottom of the saturated clay heaves or when its effective stress is zero.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Answers
a) 0.864
b) 18.76 kN/m3
c) 5.91 meters
Transcribed Image Text:PROBLEMS for EXERCISES
8
Problem:
An exploratory drill hole was made in a
saturated stiff clay having a water content of
32%. It was observed that the sand layer
underlying the clay was 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.
Cross sectional :
Hydraulic condus
nd water
level.
a) What is th
water?
b) What woI
gredient?
c) What valu
ground surface
exploratory drill hole
Saturated clay
8m
o-32%
4m
G=2.70
10 Pr
B.
Sand
3m.
A soil profile is
L
ivé stress
a) Determirne the void ratio of clay.
b) Determine the saturated unit weight of
clay.
c) How deep can the excavation proceed
before the bottom of the saturated clay
heaves or when its effective stress is
Dry
2m
stress at
pressure
A
lay
ss at point
2.5m
zero.
B
Problem:
Clay
3.5m
From the figure shown:
th of 4 m.
ga depth of
of sand is
h =1.5m
it weights of
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