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. Name: (J: #5 Mir/+56“ EXAMl Geotechnical Engineering Fall 2007 “ Problem 1 (15 points): d orieﬂ describe the followin : (a) plasticity chart Answer: w (b) ﬂow curve . Answer: ‘z/ﬁwf b D_.,_.,_ Unigocmi‘P—f Gotcha/d" f ‘_ 020 rm ' 5‘” Lin gnaw mew“ (c) relative compaction aw “be "9 Answer: RC .’ wmpﬂﬁpn “VHJG 7‘19 W ,‘mum wmfacben value. (d) moisture content P x in 4“ A w" wt @8— 5¢li¢k5, Answer: (0; 13—3“!— ratwbgnsh}p baLween Mial‘ 5" M M {7 f ‘ . (g) clay minerals " _ +
Answer: Mon-m “gawk, 5 ma liw A ; LL IT‘Z J1
\(atoLiAli’L l‘r3¢,§‘r '3) day, mine/91.5 Problem 2 (20 points): VJ
Draw a Phase Diagram for a 3-phase soil (assume Vs = 1) and show that: e ; V
, \N
(a) Vv = e [hint: from the deﬁnition of void ratio] 0 ’ "‘
(b) WS = GS yw [hintz from the deﬁnition of speciﬁc gravity] GS
(d) Ww = 0) Gs yw [hintt from the deﬁnition of moisture content] — .51).“;
(0) VW = 0) Gs [hintz from the deﬁnition of unit weight of water] 3/ ,. VJ.
(d) e S: 00 GS [hint: from the deﬁnition of degree of saturation] b; r "/3—
W’ L
\ V: ]1’6«
u T/
\‘5' |
, Y)!- Q ; ‘1'“- 5) 6?]
0‘» Q: VS .6. i V
gig... w: w; WWW
Y5 \b i -= —" :4» \A/ “ G X
., ’- ._.-——- - —-—-- 2 5 5 DJ
13> ('75 ’ m w to. ’“
Wm WM: w U a
T. :— —-—-- — - u.)
A) w W: 657:“, ’3 éww 63 .
0> 5w ' Vw ’ \lu Problem 3 (15 points): In the Uniﬁed Soil Classiﬁcation System:
2(a) Deﬁne “ﬁne-grained soil”
,(b) Deﬁne “sand fraction”
(0) What do the following symbols mean: W, P, L, H? a3 Fm; saﬁmﬁ 551' 5W Sit/1' &( Gala-7 gm‘nsigc <0.07§MM'
@5555 T701200 sieve, owl f5 4013455816. b) g A (ﬁaﬁan F5» 71v. mm 34“ 7% MM} we.an m
A“ a Z
V . (K 1:0 ’ 11¢. 4*“ :60 .SMU’G Problem 4 (30 points): The moisture content of a soil sample is 18.4%, and its dry unit weight is 100 lb/ft3. Assuming that the speciﬁc
gravity of solids is 2.65, As (a) Calculate the degree of saturation.
(b) What is the maximum dry unit weight to which this soil can be compacted without change in its
moisture content? 6‘“ ’; “7&3 Vu
5‘17;
Note that: e S: a) G5, and yd = (Gs yw)/( l+e)
' ' W — “812
as a L '2— 1:: V M), 5
Lo : Is»! ’“
7” z [0.0 'b/&
C5st , Ht - (7 b1.)
- «H- ~ 1 —<., r a ,2”
as 3“
@539) I ‘ 2195(bz'ﬂb/{ft ‘1 ’> 0193‘,
; "“f" ’ A loo 5!;
‘53»
w... ado
> 5: we; _ Isa ’25:: ., @,7q(, :5 77%a
0" C, O‘ A
V J a! af-v >45 r3 5m”"
55 Yawn“ r 2 ’3); winch yoo emf”)? $9,! V an; a Problem 5 (20 points): For a sandy soil, the maximum void ratio is 0.75, the minimum void ratio is 0.46, and the speciﬁc gravity is 2.7.
A’Vhat are the void ratio and the dry unit weight at 65% relative density? NOtCI Dr=(emax‘e)/emax'emin) ...

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