- C,<, o, oJrb e-- 6.L/k, 1 FE Review-Geotech t. A11 - PDF document

~ FE Review-Geotech Question 1: A 9.61-cni3 sainple of soil vteighs 19 g. After being dried in an oven 1 its /VL =- 1\j :'.:" (j_ ()/Ct /c.cJ .'. t,J: 0. DIC,~ ,JI 0, = 2.67~ find: \veight :i.s 17.5 g. If - \~ 3 \j =: 0 , b I ( I D :i /\,\ °i . b l t = '. lJ 5 = o. I 7 7-. ,j ::- o, o I "? ;-· l'-S . s -= 17. s:",.<.) a) Starting unit weight~ Ym O.c,1q ~9 _ D rl!j lA ,..> ·-=·,._..,--.~-- .· 9, 6 / h) D1y unit ,veight. ya l-J5 ~i T_, - i\)\.~··==- V tc c) Water content .. / ~-··-»1..J ( \ , 0 0 LJ :::- __ (IO"--"')::= 0 ,( 7L ;_s- LJ> lt)t.,J =- lJ- d) 'Void ratio. e lZ- E"M.tJ'-1 1 ;;;-R-,., /f ,j.._ ~ e., ~- o. l) b e) Porosity. n f") Degree of &aturatiorE S - C,<, o, oJrb e-- 6.L/k, 1

FE Review-Geotech t. A11 1111di:--tJ1rfa'<l• Sfll11J)fo of ch.w has. g• \yet 111.ass of .• ,l.tot,H. volurneof lt)O. kg, ·'1 .dry.n)t'i$SOftla kg1 .. and tl04Hl ni. Th€ :sQlids have a specific grnvity of 2.65. Tht:' ynidratio iB•most..uearly (A) tl.31 (B) 0.40 (C1 0,61 (D} LO w 2

FE Review-Geotech 2. A. sa tur<tte.d sa11tple. of undisturbed clay hflS a wet ma.~ i5r3l8 kg and a dry lhf:\Ss of 204 kg. The total Yolume of the san1ple is 0,19.3 m 3• Most nearly, what is the specific gravity of the soil sdlids? · (A) 2.4 (B} 2Ji (C) 2.7 (D) 2.9 \/\l - 3

~ FE Review-Geotech 3. A soil's grain-size distribution curve is as shown. The effective grain size is 0.19 rnm, and D 60 'is OA9 mm. 100 ""'\ 80 ' .. I • ' ., 1, : ' 20 '' \ a...__ • 0,001 O.Q1 OJ 10 1 grain size (mm) The coefficient of gtadation is rllost nearly (A) 0,17 (B) 0.44 (C) 1.6 .(:- (D) 3.0 I, 1 4

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ FE Review-Geotech 4. A soil has the following characteristics. percentage fines, F 69% Ftl..0 ;.A viJ I r.:::1f!F'e:::;,, CL-ll.55 1,:::::-1cA Tio~ Utfl'l.-.-1 liquid limit 72 plastic limit 48 s-oi<. 6 a% 7 { '~ 'F7A,Jc Using the Unified Soil Classification System, what is the classification of the soil? 72- > LL (A) GW s,cr-~ (B) ML (C) MH (D) CH P:t- PLDI> . Far classifie2'J111111, ctfi·!le---::,raaried :wrls M H , and m,;.g-sine,:1 tract1arc ·Cif .:,:,a:;:~iae<I Eqaatiar, of ·~.'-iil'le a: Hc.~,rJ~ Et Pi =-4 to LL = 25. 5,, x 41J !tier. Pl:="· ?3 [ll-'20J w EqillWan of "U"-une a z VMica: at LL= , 6 ID P!( = 7, men P:\=M (LL-!l} ~-+,,--1--__,,..__--+----+--+---!-- 30 ' [5, r;::Z'/ 2() :s (I) (L 10 fr'if'lrr"':..,..,..__ "v",r 71-~~ ;IJ"':t:r.+ 'J"'J.,,. ""., 4 o~~-~-~-~-~-~--'--+--'---~~-~ o rn 16 20 ::io so a:o so rno 40 60 10 ·110 7~ sample of soil has the following characteristics. \-"I =-LL -'PL ::, 3 I - I l5 % passing no. 40 screen 95 % passing no. 200 screen 57 F =- liquid limit 37 plastic limit 18 What is the AASHTO group index number? ~,:r:· = ( F --.;; s )[ O, :2.,, + 0, oc::,~(LL-'-l o)j--\- o. o \ (_ -1s-)[PI-IOJ (A) 5 (B) 6 2. z.( (),/ $,r (C) 7 (D) 8 GRANULAR MATERIALS ( 35% OR LESS PASSING oms SIEVE) GENERAL CLASSIFICATION SILT-GlAY 11/IATERIALS I MORE THAN 35% PASSING 0Jl75 SIEVE l A-1 A-2 A-7-5 A-3 A-4 A-5 A--6 A-7-6 GROUP CLASSIFICATION A-1-a A-1-b A-2-6 A-2-4 A-2-5 A-2-7 SIEVE ANALYSIS, PERCENT PASSING: s 50 - - - - - - - - - - 2.00 mm (No. 10) s 30 s 50 - - - - 51 - - - - 0.425 mm (No. 40) - s 15 s 25 s rn s: 35 s: 35 s 35 S:35 ~36 ~36 ~36 2! 36 0.075 mm (No 200)- CHARACTERISTICS OF FRACTION PASSING OA25 SIEVE (No. 40): - - s 40 s 40 s 40 LIQUID LIMIT 2 41 s 40 2 41 2 41 41 6 max s 10 s: 10 11 11 s 10 s 10 11 11 PLASTICITY INDEX* NP USUAL TYPES OF CONSTITUENT MATERIALS STONE FRAGM'TS, SIL TY OR CLAYEY GRAVH AND SAND Sill'!' SOILS CLAYEY SOILS FlNE GRAVEL. SAND SAND GENERAL RATINGASASUBGRADE EXCELLENT TO GOOD FAIR TO POOR 5

FE Review-Geotech 9. The ~P(>\~ifk gTaYity of the soil solids in a given 0 is :3.11. The pon,sity of the soil is 27%. Wliat is .~lmJ)it n1ust rwatly the (•ffcctive unit weight of the soil sarnple? ,A 1 96 lh(:ft: 3 • I I : Bl 1.1 O lbf/ ft:' U\ = 27 ,Cr 1:)n 1bf/ft 3 ,.D mo lbf;fta I +t:_. ( -;g ' I I + ('.):~ ? ) ,~ z . '-I I + o, :?, ? I+~ 10. The total unit weight of a given sojl is 120 1bf/ft 3 • Th1;:' ~1U has a porosity of 0.26 and is 100% saturated. Ti11;, dry unit w:ight of the soil is most neaty I ~ Y:r t ~ GS lbf/ft 3 !B) 8-0 lbf/ft 3 , t -.111.-, /ft 3 :::: o, 2. b tC) 100 lhf V\ (D) 120 Jbf/ft 3 \J IJ = \)l,J \j 6

FE Review-Geotech ------- 0 I'> - ~-1:, iJ\IJ\. 11. A l L field sample contains .soil with an initial wf·ig;:ht of 30 N. The soil is dried completely in ari ove11 6,;;.MA;- ~P"II"- at 100:c. The weight of the soil after drying is 22 N. The m;i;.xitnu.tn volume of the dry soil sample is 1.5 L, ,HJd th<: minimum volurne is 0.60 L. The relative density of the soil j:,, rnost hearly (A) ;J7'){ w .:- >CY~ (B) &t/;{; ( f,\ I VI.) ( l(' I ~ ::; ~: C;;'. {C) fj2(J1, \J = I L. '\., ~\- (D) 75¼ 'l l ,J, ('.)_ b \_ 12. An undisturlx~d 10 crn wide x 10 cm Jong x 5 crn high sample of d::Jy has a dry weight ofa2 kg. The dried soil sample is co1npw:t<J<l into a n,inhnnm w1hune, a rectangular prism 8.5 .crn wi<fo >< 5) cm high x 3,5 crn high. What is most nearly U1(i telt.1.tive compi1,ction of the soil sample? (A) 33% (B) 45% :,. = S"eiO t:_M (C) 49% (D) 54% ~2 k..s ~_,_,_._.·--- - -- b'---) C), 0 :;t ~DOC~ I /ll\Af) !~:...~,'.: ... C i I,;) o) p t o, 'f>' /J\J.. y 7

~ FE Review-Geotech \1 if'lA Boil sample has the particle size distribution ::;)1own. 100 i-- ,-- / 90 I/ D~o 80 I I 0> 70 V ·- C ,,....,.. - en t-'v co ~I-'- /i.-- ;:- 50 / C ... 40 J (I) n. 30 V j 20 I 4'\ L----" ' 0 0.1 1 \,IS" 10 2.-1 0, particle diameter (mm} What is most nearly the coefficient of tmiformity of the soil? (A) 0.4 (B) 0,8 (C) 3 (D) 6 8

~ FE Review-Geotech 14. A soil has ·it void ratio of OAL The unit weight of the solids is 33 kN/m 3. ·what is most nearly the sat- urated unit weight of the soil? (A) 26 kN/m 3 (B) 29 kN / m 3 (C) 33 kN/m 3 (D) 37kN/m 3 i~~, I~ ( G~ t- e-) 6~ \+e_ / +-- O,L/1 b 1 s. The water content of a saturated soil sample is 26%, and the void ratiois 0.57. The unit weight of the solids is most nearly ( A) 4.5 kN/m 3 (B} 9.8 kN/m 3 - -- (C) 22 kN/m 3 :::::c ---- \j "1v ,f - (D) 28 kN/m 3 -) ~ v '.,, \j e-- cJ<-,J e_ I ,J --- l,...JJ, e_ {..,) e- L-,1 W Yw ---A---•- 1':, "' ~~,;=,~ - I ---- = C.0 :::-- :::: \111 ~J tJ \Is ·W ( e,1, ~7)[ q, <i5f ~) ;::- 2.- I, C 6 C>. ~ 9

~ ~ ~ ~ FE Review-Geotech 16. An undisturbed soilsample with a volunie of0.30 ft 3 is weighed in a. 0.2 lbf pan. The combitied weight of the \) soil stunple and the pan is 40.5 lbf. The soil is then completely dried in an oven at 100,;,G, After drying 1 W1.v + -jr the combined weight of the soil and the pan is 35.2 lbf. - - J},. Tho unit weight of the soil solkls is 194 lbf/ft 3• \\That" is >. ':,, l ;a, rnost nearly the volume of the air-in the original soil )et' sample'? s:: ,l,..A-'\" '--c ~ .r- w,,., \ i - (A) 0.010 ft' 1 \} :.- D, 3 ~:::, \1 J - --- 6 ( p .~ ,.j J (,, l, ti _\ ~· CJ , '1.-.. l (B) 0.035 ft 3 L.,_j . ir d'*? {JJ + \:J W\? -=: L\ 0. S°'- \ ~!J ~ 0,00 ~ (0) 0.10 ft3 (D) 0.21 ft 3 W = y b. ~ )b - 0, 'L~.· lh <e; t1 o, b - v'-'r = 3 s I la I lb \Ci'-\~ lJ.:, - _ ~-I~ =- o. 1 t \} 1' ~ I~ l( f;, ,..'\- //11/ A OJO n?. ~ltnrnt:ni Sl_)i! s:nnplc is \\'(>ightcl in R :14 kg I('(~ \\"('lght ot tl1<' soil n,nd t ~;111. 1 'h(' ('( )lH bu be J)1'H 18 4t1() kg. Th<' :st)il s;nnple JB corn.plctdy dth'd in a11 nn•n. Afl(\r dr>·ing. i he crnn!>ilH':I wdght of th(' soH !-,nJnpfo nnd the p,rn i~ ~18S k~. \\ hnt 1~ 1llo~l tWnrly th(' \\nit weight of tlw s.;~turnt('d ~nil i-a mpl<'; p) :27 kX,'1n: 1 l....:J lUp = "3> t( (T3l 31 kX 'in'J 1 C) .n k:\' m:, 0)5= -~ l \} (,) k . J 0 =- 0,\ ~3 D) ,Jl · ·\ 1n·· 1 &,,. ::-- t~( I F = !{ 1~ h:..~ e,,_ :::- l0 q =LI, OB (<-~ I h .-: '3-S-I t Ld\J b s:-- le:, w,;J =- + /, f:: r7 \ IJ I ,,·•r•s·-,-,> ,,- ,..,_~,o~e~-,c;~~ ' C Y- y<;-i,~ y - V. > .("',. D ,;'-- =-res ---;~-i k~-~- tt ~-. ll' G2J Lrl l,) ,1 o. 1 {'A 'J. 10

~ ~ FE Review-Geotech 18. T1w n'sult:- of a sieve analysis are sho,v1 1. ---- - i•} l ~ I so'. l V I SJ..1' "', g'70' ·;; ..... ..,: I ... ...., ..... ! ; 50; V 40 1 I ' " i .c.. .......... , l 201 I .~1 v! ---- 11 ol I 0.01 0.1 1 10 . O,L) O,Jr' rn '" particle diameter 1mm) \Jost nearly. ,vhat is the coefficient .of curvature of the soil sample? fAJ 0.3 (BJ Q.7 0.bo~ c;,,7 IC) 2 {D) :1 11

FE Review-Geotech For a fiow net shown in the following figure, determine head loss at points A, B, and C. The structure is approximately 100 feet long. Determine the flow rate in ft 3 /min through the permeable layer. Assume hydraulic conductivity, k = 1.64x 10- 4 ft/min. 20ft. D 12