Foundation Studies - Pile Group

7/26/2019 Foundation Studies - Pile Group

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Indra S. Harahap VAB2013/EVB 4013 - Jan 2006

PART III: PILE GROP


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A. In!r"d#$!%"n

& E'a(p)* "+ P%)* Gr"#p

Keywords:single footings, foundation walls, friction pile, end-bearing pile,

footing


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& P%)* Gr"#p %n ,)a

Keywords:elevation, plan, perimeter, plan, undrained shear strength


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T"p%$ A"$%a!*d %!h P%)*Gr"#p

& E$%*n$ "+ P%)* Gr"#p

& S*!!)*(*n! "+ P%)* Gr"#p

& L"ad %!r%#!%"n A("n P%)* %n P%)*Gr"#p

& *a!%5* S%n 7r%$!%"n

& E8*$! "+ P%)* r%5%n %n P%)* Gr"#p


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B. E$%*n$ "+ P%)* Gr"#p

& O9*$!%5*:

Appreciate the difference between single pile and

pile group (model test by Kezdi and Whitaker)nderstand approach to consider effect of pile group


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& *n%!%"n

= uug

Q

Q )(

!roup efficiency

ltimate capacity of group pile

"otal capacity of single pile

)(ugQ uQ


7/55Indra S. Harahap VAB2013/EVB 4013 - Jan 2006

& S!r* %n$r*a* *)" p%)* r"#p

Keywords:single pile, pile group, stress distribution



7a$!"r A8*$!%n Gr"#p,apa$%!/E$%*n$

Keywords:load, displacement, pile group, Kezdi, diameter, spacing, fine sand

& P%)* r"#p %n and ;("d*) !*!< =*>d%



& E$%*n$ "+ p%)* r"#p %n and =*>d%

Keywords:efficiency, width, length, model test, fine sand, row, group, pile

spacing



#fficiency $%

#fficiency & %

& E$%*n$ "+ p%)* r"#p ;("d*) !*!< ?h%!a*r

Keywords:pile load, applied load, Whitaker, ultimate load of pile group, center

pile, corner pile, model test


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& E$%*n$ "+ p%)* r"#p %n $)a ;*'p*r%(*n!a)< S"*r

Keywords:pile spacing, efficiency, optimum spacing, 'owers, length, model

test, clay, entonite, calculated, measured


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& Pr"p"*d *$%*n$ *@#a!%"n


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& ,apa$%! "+ p%)* r"#p %n $)a

Step 1 *alculate capacity of single pile

Qu=Qp+Qs

Step 2 *alculate ultimate capacity of group pile

(taking into account efficiency of group pile)

Step 3 Assuming that group pile act as a single

block with dimensionLgxBgxL, calculate point

bearing and shaft resistance and of the block as

Qp

=Ag

xqg

=Ag

cu

=(Lg

xBg

)cu

Nc

*,and

Qs=2(LgxBgxL)L

Step 4 *ompare ultimate load from 'tep + and

and the lower value is Qg(u).


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E'a(p)* and App)%$a!%"n& E$%*n$ "+ p%)* r"#p

*onsider a group pile .f n1/0, and n2/, the

pile diameter,D/011mm and pile spacing,

d/211mm 3etermine the efficiency of pilegroup

24++)2115011(tan % ==

220124++

60621

0)%()%0(% =

=


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& Gr"#p $apa$%! %n $)a

#7ample %%%0

8et n1/0, n2/,D/19mm, d/%++1mm,L/%9m :ile has s;uare cross section and

embedded in a homogenous saturated clay with cu/


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S*$!%"n O#!$"(*

& A)* !" *'p)a%n !h* d%8*r*n$* %n *ha5%"r*!**n %n)* p%)* and r"#p p%)*

& A)* !" "#!)%n* +a$!"r a8*$!%n$apa$%!/*$%*n$ "+ r"#p p%)*

& A)* !" $a)$#)a!* *$%*n$ "+ r"#p p%)*

& A)* !" $a)$#)a!* $apa$%! "+ r"#p p%)* %nand

& A)* !" $a)$#)a!* $apa$%! "+ r"#p p%)* %n $)a


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R*+*r*n$*

& ,hap!*r 11.24 and 11.2 ;a Pr%n$%p)* "+7"#nda!%"n En%n**r%nan!*5 (*!h"d

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Foundation Studies - Pile Group