geotechnical investigation of wrc area

7/23/2019 Geotechnical Investigation of Wrc Area

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Geotechnical Investigat

of

Western Region Camp

Area


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Geotechnical engineering

The branch of civil engineering concerned with the engbehavior of earth materials

Very important but isnt practiced considerably in Nep

Implementation of Nepal National Building Codeis f

some extent

In WRC area important because it can helps in further

developmental wor!s"
http://en.wikipedia.org/wiki/Earth_materialshttp://en.wikipedia.org/wiki/Earth_materials


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Literature Review

Some lab and eld tests were done.Lab tests includeSoil gradationSoil classicationAtterbergs limitSpecic gravit! of soilWater contentLaborator! compactionConstant head permeabilit!California bearing ratio"irect shear test#ria$ial compression test

%ield tests Include&%ield "r! "ensit!

Standard 'enetration #


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Soil gradation

Related Standards for h!drometer anal!sis& #$T% &'(( ) *+,(--./

Hydrometer analysis

$oil Classifi

0nified $oil Classification $ystem%ost popular standard for this sy

&)('1."

#tterbergs 2i

3I$)#)4(-5 one of the adopted st2i6uid 2imit7lastic 2imit

8or li6uid limit some standard are

4:15 ##$;T< T)1: #$T% &)

8or plastic limit some standards a

5/)4:15 ##$;T< T):- #$T% &

Sieve Analysis

Related $tandards for sieve analysis9

IS: 2720 (Part 4)-1985

JIS 1204

ASTM D-421 AASHTO T-87 T-88


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$pecific =ravity of soils

Related $tandards for describing proceduresof determining specific gravity of soils are#$T% &15')4- $tandards"#$T% C4(. for soils retained on '".5mm

sieve3I$)4(-(

Water con

$ome standards foI$9(.(- ,7art (/##$;T< T)(*5#$T% &)((4*3I$)#)4(-+

Laborator! Compaction #est

Related standards for this test are9 I$9 (.(- ,7art 1/ > 4:1+ ##$;T< T):: #

California Test (4*


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Constant ;ead 7ermeability Test

7rocedures for this test mentioned in ?$ 4+..9 7#RT 59 4::-

#$T% & ('+'

3I$)#)4(41

California (earing Ratio test7rocedures for this test mentioned inI$9 :**: I$9 (.(- ,7art 4*/?$ 4+..9 7#RT '94::-3I$)#)4(44

"irect S#est

Related $tandar

ASTM D !080BS 1!77-7"1##


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8ield tests8ield dry density9 related standards are I$9 (.(1)4:.'@ ##$;T< T)4:4 #$T% &)455*

$tandard 7enetration Test9 related standardAN I$< (('.*)+ #$T% &451* #$ 4(1:"*"+"4

$ome $tandards for triaxial test are9

#$T% &'.*.)44 #$T% &(15-)-+a ?"$ 4+..)194::-

T$ia%ial &o'p$e((ion te(t


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Soil gradation

"one as per IS&)*)+ ,'art -/0123Sampling& 0 4g of Sample5 dried in an oo

oven at 6++ for )- hours


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;B&R


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7ven dr! method&"one as per IS&),'art) /01*8

Sampling&

%ethodology

,water content determination/


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C?R TA$T

0sed for determining the relative bearing r 0sed extensively for the selection of mater

control of sub grades

2oad carrying capacity in the field $oil sieved through +."5mm used


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Atterbergs limits

Li9uid and plastic limits ,"one as pIS&)*)+ ,'art 3/0123

Sampling&

0++gm of sample passing -)3 I$seive was mixed with water and left for (' h


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pec c rav !"etermination

'!cnometer method &As per IS )*),part8:sec/8/012+

Sampling&

Sample was pulveri;ed and passedthrough )mm IS sieve


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compaction test,7roctor method/

Sampling& 34g of air dried sample was ta4en

Sieved through -.*3mm is sieve

Sample mi$ed thoroughl! with 3< bmass


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"r! densit!

sand replacement method &As perIS&)*)+,'art )2/01*-

Calibration5 calculation of dr! densof sand

"r! densit! of soil calculation


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standard penetration test

Conducted in the eld according as IS: 211-

1981

7b=ective& bearing capacit! calculation ofundisturbed soil sample

>9uipment used& ?on4e! hammer,68.34g5*3cfree fall5 "rilling e9uipment ,0++ to 03+ mmdiameter5 Split spoon sampler5 "riving rods5Lifting bails5 ropes and other S'# accessories.


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?ethodolog!

%ield assembl! of the S'# e9uipments

Split spoon sampler was attached to the drilling

"rilling rod was mar4ed and the ground level wacalculate the penetrated depth.

@ammering from *3cm fall and noticing depth fo03503 and 03cm penetration


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!ield assem

SP$ in %&'

S#A"S

&II*+ &,S

,*./ HA/


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Sampling..

After nishing -3cm5 sample ta4en Bndisturbed sample from split spoo

sampler

atural water content was obtained*IS$&/ SAP/


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'ermeabilit! test

)e$*o$'ed te(t" &on(tant+ead pe$'ea'ete$ 'et+o

,as per IS" 2720 ,pa$t 17-1##./

O/e&tie9determination of coefficient of permeabilit

3uip'ent u(ed "permeameterreservoirweighing

balancethermometerstopwatch


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?ethodolog! Sam3lin: ).34g of soil ta4en 5poured into the permea

,):85 both sides protected with porous stones Proed6re Length and CSA ,L 5A was measured sample was connected to the constant head reservoir

Air was removed from cell and sample was made satur Water collected on the base outlet was measured at ce

interval for same time

#he dierence of head ,h in levels "eteen onstan

reservoirand o6tlet in te "asewas measured.


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?ethodolog!

Lab arrangement of apparatus&


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"irect shear test

Carried out according to IS: 2720(3art 1

198D.

,";etive: determine shear strengthparameters ,c and E

/


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?ethodolog!

Sam3lin:

performed forcohesionless5grannular soil5 disturbedsample placed in

the shear bo$ withlight compaction inbetween porous

stones


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?ethodolog!

Proed6re:

Shear bo$ dimension and sample weight ta4

'roving ring and dial gauges ad=usted

With constant normal stress hori;ontal strainwas given until strain reaches )+


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'onsolidated 6ndrained tria=ia

'erformed according to IS: 2720 (3art 11

1971>

,";etives: determination of shear strengparameters,c and E

/


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?ethodolog!

Sam3lin:

compaction5 mouldingand e$cluding

Inserted in themembrane with topand bottom platen andtightl! overwrapped.

?>#@7"7L7G


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F..?>#@7"7L7G

Sample is placed in the

tria$ial cell Sample is made

saturated andh!drostatic pressure H8

?easurement& porewater pressure5 dialgauge and proving ringreading


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General discussion

a tria$ial cell

b load cell

cload cell displa

e water pressu

ASS/ *,$I!I'A$I,*


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?ethodolog!

Jalue of eective ma=or and minor principle stres

calculated H 0 5H8

?ohrs circle is plotted and failure plane is notice

Jalues of shear parameters ,?@ ) are obtained.

Shear strength &s B CD tan@


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>$amples of mohr circle

Data anal(i( and )$e(entation


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Data anal(i( and )$e(entation

Siee 5e(ult(

06 ' dept+ 1 ' dept+ 16 ' dept+

+

0+

)+

8+

-+

3+

6+*+

< Gr

< Co

< ?

< %in

< Si


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).-2).3

).3)).3-).36).32).6

).6)).6-

Spe&i*i& $ait

)8)-)3)6)*)2

)1

Bul9 den(it


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;ydrometer results

Soil activit! +.08Ko.*3Inactive o shrin4age and swelling

+.+0+++.0+++

+

0+

)+

8+

-+

3+

6+

*+

2+

1+

iameter ? m

Perent Ener?F


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$oil Classification,#s per 0$C #t -"5 m depth

R(-- E:(FG5-F,Coarse grained/ R'E((FH-"5R(--,$andy/

Cu E4+"+*G*

CcE-"-5H4

F =ravel fraction,=8/E((FG45F

7lasticity Index E -"55H' #s per table of 0$C$

The soil sample is

)oo$l g$aded g$ael :it+ (ilt and (and

=roup symbol9)-M


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$oil Classification,Cont #t 4"- m depth

R(-- E:+FG5-F,Coarse grained/ R'E'(FH-"5R(--,$andy/

Cu E+1"'*G*

CcE-"(4H4

F =ravel fraction,=8/E'(FG45F

7lasticity Index E -".+H' #s per table of 0$C$

The soil sample is

)oo$l g$aded g$ael :it+ (ilt and (and

=roup symbol9)-M


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$oil Classification,Cont#t 4"5 m depth

R(-- E::"1(FG5-F ,Coa$(e g$ained/

R'E*+FG-"5R(--,$aell/

Cu E4'"5.G*

CcE4"(1,4HCcH+/

F =ravel fraction,=8/E*+FG45F

7lasticity Index E -".+H'

#s per table of 0$C$

The soil sample is

;ell g$aded g$ael :it+ (and

=roup symbol9;


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Atterberg limitsi5 m) i


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Atterberg limits,contFPlasti limit(0>5 m) Plasti limit(1 m)


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#tterberg 2imits,cont/

LL/'L +.33

%eansJJJJJ


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a an e r! ens !result

Lab and eld dr! densit! result,cont..


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ons an ea permeat t


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ptest

N+.+-2 Well graded sand! and gravell!

soil,AS#?


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California bearing ratio test

Soa4ed sample used C(R -.-:+)

?anu 4umar 'oudel,+66:(C>:01

San=a! 4umar adav,+66:(C>:88 Shan4ar Nhanal,+66:(C>:81

geotechnical investigation of wrc area

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