slope stability analysis using Flac

Slope Stability Analysis BY SUDARSHAN BAROLE 15CE64R07 DEPARTMENT DEPA RTMENT OF CIVIL ENGINEERING INDIAN INSTITUTE INSTITUTE OF TECHNOLOGY TECHNOLOGY KHARAGPUR

Slope stability o !o"esi#e an$ %i!tional soil 

&%oble' state'ent(

 )o pe%o%' slope stability analysis o e'ban*'ent +n$e% ollo,in!on$ition 1. slope +n$e% $%y !on$ition / e'ban*'ent ,it" ,ate% seepa-e t"%o+-" it   E'ban*'ent ,it" en!o+%a-e2nailin )o 3n$ o+t a!to% o saety in ea!" !ase an$ also to 'o$el s"ea% st%ain $ist%ib+tion in e'ban*'ent

E'ban*'ent $etails

ate%ial p%ope%ties 

Silty(!lay 'ate%ial is +se$ ,it" ollo,in- p%ope%ties(



Soil

$ensity /500 *-2'

po%osity 

s"ea% 'o$+l+s 0 e &a

pe%'eability 1e(10 '2s

b+l* 'o$+l+s 1e &a

$ensity o ,ate%1000 *-2'

%i!tion an-le 15 

!o"esion /0000&a

Nail

!s a%ea 5e(4 '/ pa

yo+n- 'o$+l+s o elasti!ity 1e11

tensile 1e10 N

Bon$ st%en-t"8N2'9 00000

1Slope stability( $%y !on$ition Inputcode 

!on3- -,:o, e;t%a 10



-%i$ /.16



-en 800.009 800.09 850.09 850.009 i 1 <



-en 850.009 850.09 8100.1009 8100.009 i < 17



-en 8100.009 8100.1009 8/50.1009 8/50.009 i 17 



'o$el 'o"% i1./ =1.16



3; ; y =1



3; ; i1



3; ; i



set -%a#ity<1



set :o,o> 



-%o+p ?1@silty(!lay? notn+ll



'o$el 'o"% notn+ll -%o+p ?1@silty(!lay?



p%op $ensity/5000 b+l*1E s"ea%E !o"esion/00000 %i!tion150 $ilation00 tension00 notn+ll -%o+p ?1@silty(!lay?



"isto%y <<< +nbalan!e$



sol#e elasti!

a!to% o saety $%y !on$ition

/ Slope stability( seepa-e t"%o+-" e'ban*'ent ate% table is a$=+st +p to top on bot" si$e o e'ban*'ent As $+e to $i>e%en!e in ele#ation o ,ate%. t ,ill :o, t"%o+-" e'ban*'ent an$ t"e !onto+% o $e-%ee o sat+%ation obtain is s"o,n belo,

np+t !o$e



p%op po%0 pe%'10E(10 notn+ll



set :o,on



,ate% b+l*10E<



,ate% $ensity10000



set +nsaton



set 'e!"ani!alo> 



apply pp 00 #a% 00 00000 %o' 1.17 to 1.1



apply pp 00 #a% 00 1000000 %o' .17 to .1



apply pp 00 %o' 1.17 to 17.17



sol#e



initial sat+%ation 00



sol#e

Sat+%ation !onto+%

Conto+%s o $e-%ee o sat+%ation in e'ban*'ent

a!to% o saety

 Slope ,it" %eino%!e'ent NAL DE)ALS( C%oss se!tion a%ea 5e(4 '/ tensile 1e10 N

yo+n- 'o$+l+s o elasti!ity 1e11 pa Bon$ st%en-t"8N2'9 00000

Bon$ st%en-t" 15e10 Len-t" an$ lo!ation o nail 554'  5/' %o' botto' o e'ban*'ent 54'   ' %o' botto' o e'ban*'ent

Slope ,it" %eino%!e'ent

Dis!+ssion 1o% $%y slope( a!to% o saety10< / os +n$e% seepa-e !on$ition1  os o% %eino%!e$ soil11 St%ain %ate in!%e'ent is obse%#e$ in  !ases an$ also plot o a!to% o saety is obse%#e$