Exam 1 CE335 - if fig Name(J#5 Mir 56“ EXAMl...

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Unformatted text preview: / if fig? . 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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