CIVE 431 Exam 2 Solution, Spring 2001
American University of Beirut · Soil Mechanics and Laboratory · 35 pages · with solution
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SPRING 2000 SS oy
Professor: Salah Sadek Lae
CLOSED BOOK/NOTES, 11/2 HOURS
Name: Kate. Newsy ID #: A2-<> 2078
IMPORTANT NOTES:
° Manage your time carefully (quickly read through all the problems
before starting the exam, & do not spend an hour on one problem).
e Whenever, you are "stuck" or feel that you need some information not
provided, just assume, justify your assumption and proceed.
2 Be NEATII!! Write Clearly and clearly highlight your answers. -_-
Good Luck!
TECHNICAL NOTES:
The following might be of help:
Unit weight of water, yy = 9.81 kN/m3 = 62.4 Ib fi
Consolidation:
Time factor T=c,.t/H*
re between Time Factor and U (%.consolidation)
U (%)
100
80 +—
60
40 4
20
Wo
|
02 04 06 08 1 12 16]!
Time Factor, T PS
Degree of comsalidation. U
Pa
u
< o on o> Us 2 Us Ob OF US OF tet
Us
PROBLEM -1 (20 Pis)
Indicate where appropriate whether the following statements are true or false by circling
the T or F respectively on the line to the right. (No penalties will be assessed for wrong
answers). Other problems may require a short answer in the space provided.
a. (2pts) Which of the following is independent of the choice of datum. Check the
correct answer(s):
_ As, Pressure head 27
i ToiX head
Elevation head
oy
—> b. (2pts) A soil element will respond to a change in (Cota) stress by an appropriate
: change in volume (densification ifthe total stress increases)
‘eff —
¢. (2pts) Tarzan was right in being terrified of sinking in Quick Sand.
-
d. (2pts) The construction of flow ners is useful because it allows us to solve graphically
1-D, 2-D and 3-D flow problems.
NaG 2 ) = @ iF
e. (2pts) For any given problem geometry, the flow net drawn is independent of the value
of the hydraulic cenductivity of the soil, provided that the soil is homogeneous and
isotropic. WV
SL?
Os
f, (3pts) The maximum past effective pressure of a clay sample was determined to be
4000 1b/ft2. The sample was obtained from a depth of 25 ft below the ground surface.
The unit weight of the soil is 110 Ib/ft3. ‘The sample, as it was in the field, was Normally
Consolidated. ao\)- OK Sp. Jae d/
v : Eel Say,
DEL SehT =o Wot Ninth Cis | S78
g. (4pts) It takes one hour for a sample in a consolidation tesi to reach a degree of
consolidation of 85%. The sample is free draining at both ends and is one inch thick. A
30 ft thick layer of this clay in the field, also drained at top and bottom, will reach 85%
consolidation in about 60 years.
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