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Solution manual for soils and foundations 8th edition by liu

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Pearson Prentice Hall™ is a trademark of Pearson Education, Inc.. Pearson® is a registered trademark of Pearson plc Prentice Hall® is a registered trademark of Pearson Education, Inc..

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Upper Saddle River, New Jersey

Columbus, Ohio

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Copyright © 2014, 2008, 2004, 2001, 1998, 1992 by Pearson Education, Inc., Upper Saddle River, New

Jersey 07458 Pearson Prentice Hall All rights reserved Printed in the United States of America This publication

is protected by Copyright and permission should be obtained from the publisher prior to any prohibited reproduction,

storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying,

recording, or likewise For information regarding permission(s), write to: Rights and Permissions Department

Pearson Prentice Hall™ is a trademark of Pearson Education, Inc

Pearson® is a registered trademark of Pearson plc

Prentice Hall® is a registered trademark of Pearson Education, Inc.

Instructors of classes using Fennimore, Sustainable Facility Management: Operational Strategies for Today, 1/e

may reproduce material from the instructor’s manual for classroom use

10 9 8 7 6 5 4 3 2 1

ISBN-13: 978-0-13-511393-6

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(d) Eq.(2-15): 2.64=50/(62.4Vs); v,=0.304 ft3

Vw = (62 - 50)/62.4 = 0.192 ft3

v ;=0.56 - 0.304 =0.256 ft3

Eq (2-7): e = 0.256/0.304 = 0.84(e) Eq (2-8): n=[(0.064 + 0.192)/0.56)(100) = 45.7%

v;= 1 - 0.59=0.41 ft3

Eq.(2-7) e = 0.4 /0.59 = 0.69(c) Ww = (0.18)(100.4) = 18.1 ib

Vw=18.1/62.4 =0.29ft3

Eq.(2-9): S = (0.29/0.41)(100) = 70.7%

(2-6) Work with 1 ft3 of specimen

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3(a) Eq (2-7): 0.56 =Vv/Vs; v ; =0.S6Vs

(b) Eq (2-15): G,=79.4/[{0.46){62.4)] =2.77(2-8) Work with 1 ft3of specimen

(c) Eq (2-15): Gs== 15.80/[(0.581){9.81) = 2.77(2-9) Work with 1 ft3ofspecimen

v;+ Vs=1; 0.94SVs+v,=1; v ,= 0.514 ft3

v;= 1- 0.514 ==0.486 ft3

Ww=(62.4}{0.486) = 30.3 Ib

Eq (2-15): 2.70=W,/[{0.514)(62.4)]; Ws= 86.6 Ib

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0.140, or 0.319 ft3, must be added to each cubic foot Thisis {0.319)(62.4}, or 19.9 Ib of water.

{2-22} (a) Work with 1 ft3 ofspecimen

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CHAPTER 3

(3-1) (a) Po= (10)(120)/2000 = 0.600 ton/ft''

Eq (3-1): CN=0.77log10 (20/0.600) =1.17Ncorrected=(1.17)(26) =30

(b) 10 ft =3.048 m and 120 Ib/ft3 =18.85 kN/m3

Po=(3.048}{18.85) =57.45 kN/m2

Eq (3-3): Ncorrected=(26)(100/57.45)1/2 =34(3-2) (a) Po= [(8)(120) + (2)(120 - 62.4)]/2000 =0.538 ton/ft''

Eq (3-1): CN= 0.77log10 (20/0.538) = 1.21Ncorrected=(1.21}{26) =31

(b) Po=1.08 klps/ft''=51 71 kN/m2

Eq (3-3): Ncorrected=(26)(100/51.71)1/2 =36(3-3) (a) Po=(7)(20.40) = 142.8 kN/m2

Eq (3-2): CN =0.77 IOg10(1915/142.8) =0.868Ncorrected= (0.868)(22) = 19

(b) Eq (3-3): Ncorrected=(22)(100/142.8)1/2 =18(3-4) (a) Po= (2)(20.40) + (5)(20.40 - 9.81) = 93.75 kN/m2

Eq (3-2): eN=O.77loglO (1915/93.75) =1.01Ncorrected=(1.01)(22) = 22

(b) Eq (3-3): Ncorrected=(22)(100/93.75)1/2 = 23(3-5) Eq,(3-4): c=61/{{rr)[{4/12)2(8/12}{1/2) + (4/12)3(1/6)]} =449 Ib/ft2

From Fig 3-17 with PI = 40%, Il = 0.85 Hence, ccorrected= (0.85)(449) = 3821b/ft2

(3-6) A plot of time versus distance is given on page 8

slopeline 1=0.083/80 =0.001038slopeline 2=(0.093 - 0.08675)/(180 -100) =0.00007813

VI=reciprocal of slopeline 1=1/0.001038 =963 ft/secV2=reciprocal of slopeline 2=1/0.00007813 =12,800 ft/sec

L=82 ft (from plot on page 8)

Eq (3-6): HI=(82/2)[(12,800 - 963)/(12,800 +963)]1/2=38 ftWith VI = 963 ft/sec, according to Table 3-3, the subsurface material in the first layer is estimated to benormal sand or loose sand above the water table With V2= 12,800 ft/sec, according to Table 3-3, thesubsurface material in the second layer is estimated to be hard limestone, basalt, granite, or unweatheredgneiss

(3-7) Electrode Resistance Resistivity Cumulative

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9Electrode spacing (column 1 in the preceding table) gives the approximate depth of subsurface materialincluded in a given measurement Resistivity (column 3 in the table) is computed from Eq (3-7), where D

is electrode spacing (column 1) and R is resistance (column 2) Hence, for the first row in the table,

p = (2)(n)(10)(12.73) = 800 ohm-ftValues in column 4 are cumulative resistivity values A plot of electrode spacing versus cumulativeresistivity is shown on page 10 From this plot, the thickness of the first soil layer is determined to beapproximately 63 ft Because the resistivity of the upper layer is in the range from 50 to 500 ohm-ft

according to Table 3-4, the subsurface material in this layer is estimated to be moist to dry silty and sandysoils Because the resistivity of the lower layer is in the range from 500 to 1000 ohm-ft according to Table3-4, the subsurface material in this layer is estimated to be well-fractured to slightly fractured bedrockwith moist-soil-filled cracks

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Chapter 4(4-1) Eq (2-11): 'y=[(3815 - 2050}/453.6J/(1/30) == 116.7Ib/fe

Eq.(4-1): 'Y d=116.7/(1 + 0.0 1) =107.0 Ib/fe

(4-2) : ':: : ': : : :-;';: ';'.: ;':.';: ;f(: ' : ':i":';:' : :: ! ' : _ _

113 -Maxl m ufu- - ary :- unit wt ~ I EL6 lb/ft : ~ ;: : ' : :. I: ; ':: :

loa i.: · ::~ : :: : ::fi; ::: :;, :::;.:~:: - - - • :i ; ' ;:. : ;::.:: : · ·· : ;:: · : ::: · :1 : :: ·· : · ;~&· '.:::I!~::'' :i: - ~::::::!:!:: : , ::::E::t::::•.•!~i:';';l::;~::-:::~; ;;lliill:: :::· ;;;":

I·:·:;; tlr:::-:F=:::: ·· •••: ;;:::::: ::"::':W:::li: ::~,::::: 1:::;J§]:::: ::::t;()'::::

M ois t re Co n tent ( I)(4-3) 95% of the maximum dry unit weight =(0.95)(112.6) =107.0 Ib/fe

From the compaction curve of Problem 4-2, the range of water content most lkely to attain 95% or more

of the maximum dry u it weight is 9%to 19%

(4-4) From Table 4-3, with maximum dry unit weight =104.8 Iblfeand optimum moisture content =20.7%, the

possible type of soil for this sample is estimated to be A-7-6 clay or A-6 silty clay

(4-5) Weight of soil used in test hole =845 - 323 = 522 g

Volume of test hole ={522/453.6}/100 =0.0115 fe

Eq (2-11): 'Y ={648/453.6)/0.0115 = 124.2Ib/fe

Eq (4-1): 'Yd=124.2/(1 +0.16} =107.1Ib/fe

(4-6) Percent compactio achieved = (107.1/112.6)(100) =95.1%

(4-7) let subscript lib" denote soil in b rrow pit and subscript "f 'denote soil in the fill

O.4S{Vsl!+{Vsl =2500; (Vs}f=1724 m3Because (Vs)b={Vs)f,0.5952Vb =1724

(4-8) Eq (4-3): D = (0.5)[(20)(10)]1/2 = 7.1 m

11

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(6-1) Eq (6-2): j5=(20.72)(2.5) +(20.72 - 9.81)(6) +(19.69 - 9.81)(7) =186 kN/m2

Eq (6-3): ~w =(9.81)(6 + 7)=128 kN/m2

Eq (6-4): Plotal= 186+128 = 314 kN/m2(6-2) Eq (6-7): P=(3)(200,000)/{(2)(n)(15)2[1 +(0/15)2]s/2} = 4241b/ft2(6-3) Eq (6-7): P = (3)(200,000)/{(2)(n)(15)2[1 +(1O/15)2]s/2} = 1691b/ft2

P=(0.424)(4500) = 1908 Ib/ft2(b) z/a= 18/12 =1.5; ria =6/12 =0.5; Influence coefficient =0.374

P=(0.374)(4500) = 1683 Ib/ft2

(6-7) (a) z/a =3/(3/2) =2.0; ria =(3/2)/(3/2) =1.0; Influence coefficient =0.194

P=(0.194)(250) = 48.50 kN/m2(b) Overburden pressure at 3-m depth = (3)(16.38) = 49.14 kN/m2Total vertical pressure =48.50 +49.14 =97.64 kN/m2

(6-8) mz=12; z=15; m=12/15 =0.80

nz = 8; z = 15; n=8/15 =0.533Influence coefficient ==0.115

P = (0.115)(6000) = 690 Ib/ft2

(6-9) mz=6; z=25; m=6/25 =0.24

nz=6; z=25; n=6/25 =0.24Influence coefficient = 0.026

P=(4)(0.026)(5000) = 520 Ib/ft2(6-10) Divide the footing area into four equal parts, each 1 m by 1m For each part,

mz = 1; z= 4; m = 1/4 = 0.25

nz= 1; z=4; n=1/4=0.25Influence coefficient =0.027Net vertical pressure increment at base of footing =1000/[(2)(2)]- (16.80)(1.8) = 219.8 kN/m2

p=(4)(0.027)(219.8) =23.74 kN/m2(6-11) (a) Divide the area into three rectangular parts:

Part 1, upper left area, 16ft by 12 ftPart 2,lower left area, 16 ft by 12 ftPart 3, lower right area, 20 ft by 12 ftPart 1: mz=16; z = 24; m= 16/24 =0.667

nz= 12; z=24; n= 12/24 =0.500

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(b) Divide the area into three rectangular parts :

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(b) Below point J:

, 1'

,I

Influence coefficient =0.062

Influence coefficient =0.022

Area JHDE: same as Area FCHJ;

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The "e-log p" curve is shown on page 18.

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tie - log p " Cur.v e for Problem (1''. ' ')

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[p= 160 kN/m2] > [Po'=125 kN/m2]; Use Eq (7-22)

s, =(0.06)[3.8/(1 + 0.70)] log (125/108) + (0.30)[3.8/(1 + 0.70)] log (160/125) '" 0.080 rn, or 80 mm(7-9) Because the compressible clay layer is underlain by permeable sand and gravel, this is a double drainage

for clay layer, with H = (85 - 76)/2 = 4.5 ft

(1) When U = 10%, Tv = 0.0077 (from Fig 7-17)

Eq (7-29): tlO = [0.0077/(2.18 x 10-3)](4.5 x 12)2 = 10,300 min, or 0.020 yr

(2) When U=20%, Tv '" 0.0314

t20= [0 0314/(2.18 x 10-3)](4.5 x 12)2=42,001 min, or 0.080 yr

(3) When U = 30%, Tv = 0.0707

t30 = [0.0707/(2.18 x 10-3)](4.5 x 12)2=94,569 min, or0.180 yr(4) When U=40%, Tv=0.126

t40 = [0_126/(2.18 x 10-3)](4.5 x 12)2= 168,539 min, or 0.321 yr(5) When U=50%, Tv=0.196

t50 = [0.196/(2.18 x 1O-3)]{4.5 x 12)2 = 262,172 min, or 0.499 yr(6) When U = 60%, Tv = 0.286

t60 = [0.286/(2.18 x 1O-3}](4.5 x 12}2 = 382,558 min, or 0.728 yr(7) When U = 70%, Tv = 0.403

t70 = [0.403/(2.18 x 10-3)](4.5 x 12)2 = 539,059 min, or 1.026 yr(8) When U = 80%, Tv = 0.567

t80 = [0.567/(2.18 x 10-3)](4.5 x 1d = 758,428 min, or 1.443 yr(9) When U = 90%, Tv = 0.848

t90 = [0.848/(2.18 x 10-3)](4.5 x 12)2= 1,134,297 min, or 2.158 yr

U (fraction of total settlement)

(%)102030405060708090100

Settlement(in.)

0.370.73

1.10

1.46

1.83

2.202.562.933.293.66

The time-versus-settlement curve is given on page 20

Time(yr)0.0200.080

0.180

0.321

0.4990.728

1.026

1.4432.15800

(7-10) P =Po+ t.p =108 + 52=160 kN/m2

[p = 160 kN/m2] < [Po'= 185 kN/m2]; Use Eq (7-21)

Sc=(0.06)[3.8/(1 + 0.70)] log (160/108) =0.023 m, or 23 mm(7-11) (1) When U = 90%, Tv = 0.848 (from Fig 7-17)

H = 12 ft (single drainage)

Eq (7-29): t90 = [0.848/(9.04 x10-4)](12 x 12)2 = 19,451,469 min, or 37 yr(2) 1yr = 525,600 min

Eq (7-29): 525,600 =[Tv/(9.04 xlO-4)](12 x 12)2

Tv = 0.023From Fig 7-17, with Tv=0.023, U=15%

Settlement at 1 yr = (0_15)(4.60) = 0.69 in

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A

-I 0

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For a depth of 5 ft, avera e corrected N-value =28.

For a depth of 7.5 ft, average corrected N-value = {28 + 27)/2 = 28

For a depth of 10 ft, average corrected N-value = {28 + 27 + 30)/3 =28

For a depth of 12.5 ft, averag corrected N-value ={28 +27 +30+28)/4 =28

For a depth of 15 ft, average correcte N-value =(28 +27+30 +28+23)/5 =27

be multiplied byXB. Therefore, in this problem, q = 3.06 tons/ft" will produce (1)(1.062) in of settlement

Therefore, 3.06/1.062 =qallowableforloin.settiemenJ1qallowableforloin.settlemen=t2.88 tons/ft''

(7-17) For Eq (7-33),

Ap =800/[(2}(2)] - (17.5)(1) =182.5 kN/m2

Cl=1- (0.5)(17.5/182.5) =0.952(2 = 1+0.2 log [(10)(4)] = 1.32

table on page 22)

Eq (7-33): St(4yr)=(0.952){1.32)(182.5)(lo.5 x 10.5) = 0.024 m, or 24 mm

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*Column headings are:

A layer thickness (Az), m

B Depth from base of footing to center of layer, m

C Modulus of elasticity of sand layer (Es),kN/m2

D Strain influencefactor for soilzonezdepth below foundation (obtained from graph

above) (lz), dimensionless

E (lJEs)(Az), m3/kN

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