7_Longsoran Baji

8/16/2019 7_Longsoran Baji

1/21

LONGSORAN

BAJI (WEDGEFAILURE)HTKB – 642/GEOTEKNIK TAMBANG TERBUKARomla Noo Ha!"m – E!o Sa#$o%o & Sa" M'la$"

ROGRAM STUDI TEKNIKERTAMBANGAN

FAKULTAS TEKNIK UNIERSITAS LAMBUNG MANGKURAT


2/21

Lo#*%oa# $'+a," a!"-a$!'$",a!m'#'.%a# a#*m'mo$o#* !'m""#*a# l''#*," ma#a %'0"#**a $'-'#$.!-a+" a#* -",a#* *'l"#1"#a

-'a,a a,a 'o$o#*a#a#$aa ,.a -",a#*!'$",a!m'#'.%a# a#*%al"#* -'o$o#*a#

Lo#*%oa# -a+" l'-"0 m.#*!"#$'+a," ,"-a#,"#* lo#*%oa#

-",a#*3 +"!a ,"$"#+a. ,a" %'*"*'om'$" ,a# !o#,"%"*'olo*"3 %'0"#**a !a+"a#m'#*'#a" !'%$a-"la# -a+"m'.a!a# %.a$. !omo#'#'#$"#* ,alam '!aa%a

l''#* -a$.a#

KONDISI UMUM

%$o#*3 ol1a#"1 o1! o#I#$'%$a$' 53 #'a Ga#$% a%%3

O'*o#HTKB462 & Lo#*%oa# Ba+" 2


3/21

ONTOH LONGSORAN BAJI

W',*'7om', --',,"#*(l'7$) a#, a

1o#+.*a$' +o"#$ %'$("*0$)8%l","#*o11.', o#-',,"#*

9"$0 +o"#$%a1$"#* a% a'l'a%'%.7a1'(-',,',%0al'3 #'a

H'l'#a3Mo#$a#a)

HTKB462 & Lo#*%oa# Ba+" :


4/21

D.a -",a#* !'$",a!m'#'.%a# 0a.% %al"#* -'o$o#*a# m'm-'#$.!%$.!$. *a"%;

a,a %$''o#'$3 *a"% 'o$o#*a# ,"9a!"l " ol'0 $ "$ "! ," ma #a ,.a -.%.-",a#* %al"#* -'o$o#*a#;

K',.,.!a# *a"% 'o$o#*a# ( aa0 ,a# !'m""#*a#) ,"+'l a%!a# ,'#*a#"%$ " la0 $'#, (α " ) ,a# l.#*' (ψ " .

l.#*' *a"% 'o$o#*a# 0a.% l'-" 0 la#,a" ,a" !'m""#*a# l''#* ,a#l'-"0 $'*a! ,a" a$a&a$a %.,.$ *'%' ,ala m !',.a -",a#*!'$",a!m'#'.%a# ψ < > ψ " > φ.

ERS=ARATAN GEOMETRI

HTKB462 & Lo#*%oa# Ba+" 4


5/21

K'm""#*a# l''#* (ψ < ) ,".!. ,a" %.,.$ a#,a#* !a#a# $'0a,a

*a"% 'o$o#*a#;

I#*a$ -a09a ψ < 0a#a a!a# %ama ,'#*a# ψ 7 (!'m""#*a# l''#*

%'-'#a#a)3 + "!a aa0 !'m""#*a# *a"% 'o$o#*a# %ama ,'#*a#aa0 !'m""#*a# l''#*

Ga"% 'o$o#*a# 0a.% m'm"l "!" aa0 !'m""#*a# a#*m'm.#*!"#!a# .+.#* *a"% *'l"#1" $ama! ," m.!a l''#*; T'#,a#* m'm.#*!"#!a# -'!"%a a#$aa α " a#, α

ERS=ARATAN GEOMETRI



6/21


7/21

GEOMETRI BAJI =ANG TIDAKLONGSOR

HTKB462 & Lo#*%oa# Ba+" >


8/21


9/21

Fa!$o !'ama#a# -a+"3 +"!a ,"a%.m%"!a# *'l"#1"a#0a#a -'*a#$.#* a,a %.,.$ *'%'! ,alam φ ,a##"la"#a %ama .#$.! !',.a -",a#* a,ala0

FAKTOR KEAMANAN (FS)

RA3 RB ? *aa #omal !',.a

-",a#*W ? -'a$ -a+"

HTKB462 & Lo#*%oa# Ba+"


10/21

RA ,a# RB ,"$'#$.!a# ,'#*a#

m'#'l'%a"!a# ,.a '%amaa#;

S.,.$ ξ ,a# β ,".!. a,a%$''o#'$;

U#$.! m'#1aa" !'%'$"m-a#*a#3!omo#'# *aa #omal 0a.%-'#"la" %ama ('%;C),a# +.mla0!omo#'# %'+a+a *a"%'o$o#*a# 0a.% %ama *aa-'a$ a#* -'!'+a %'aa0 *a"%

*'l"#1" ('%;2)

ENENTUAN RA DAN RB

HTKB462 & Lo#*%oa# Ba+" C


11/21

FAKTOR KEAMANAN

• Da" !',.a '%amaa#%'-'l.m#a ,aa$,"$'#$.!a# .m.% la"#.#$.! m'#'#$.!a# 7a!$o!'ama#a#;

• FSW ? 7a!$o !'ama#a#-a+" a#* 0a#a-'*a#$.#* a,a*'%'!a# %a+a

• FS ? 7a!$o !'ama#a#

lo#*%oa# -a+" .#$.!-",a#* ,'#*a# %.,.$*'%' ,alam ,a#!'m""#*a# *a"%'o$o#*a# ";

• K ? 7a!$o -a+" a#*

-'*a#$.#* a,a %.,.$a#$aa ,.a -",a#* ,a#HTKB462 & Lo#*%oa# Ba+" CC


12/21

FAKTOR BAJI (K)

HTKB462 & Lo#*%oa# Ba+" C2


13/21

D.a -",a#* m'm-'#$.! -a+"3,'#*a# !'m""#*a# -",a#* Bl'-"0 -'%a ,a" A;

K'$'a#*a# *a"%&*a"% a,a*am-a

Ga"% C ? 'o$o#*a# -",a#*A ,'#*a# !'m""#*a# l''#*

Ga"% 2 ? 'o$o#*a# -",a#*B ,'#*a# !'m""#*a# l''#*

Ga"% : ? 'o$o#*a# -",a#*

A ,'#*a# !'m""#*a# l''#*a$a%

Ga"% 4 ? 'o$o#*a# -",a#*

Ga"% 5 ? 'o$o#*a# -",a#*A ,a# B

ANALISIS LONGSORAN BAJI DENGANMEMPERTIMBANGKAN KOHESI, GESEKAN,

DAN TEKANAN AIR

HTKB462 & Lo#*%oa# Ba+" C:


14/21

L''#* ," -'la!a#* 1'%$ m'm"l"!" !'m""#*a# $'$'#$. (l'-"0 la#,a",a" l''#* ," -a9a0#a)

T"#**" $o$al l''#* ,"0"$.#* ,a" ,a%a -a+ " %ama" .#1a! -a+" a#*$ama! ," m.!a l''#* ," -'la!a#* 1'%$

D"%$"-.%" $'!a#a# a" ,"0"$.#* ,'#*a# a%.m%" -a+" "m'm'a-l' ,a# a"ma%.! ,a" a$a% %'a#+a#* *a" % 'o$o#*a# : ,a# 4 ,a# !'l.a ,a"

m.!a l''#* %'a#+a#* *a"% 'o$o#*a# C ,a# 2; Ha%"l #a3 $'!a#a#ma!%"m.m $'+a," %'a#+a#* *a"% ' o$o#*a# 5 ,a# -'#"la" #ol%'a#+a#* *a"% C3 23 : ,a# 4;

ANALISIS LONGSORAN BAJI DENGANMEMPERTIMBANGKAN KOHESI, GESEKAN,

DAN TEKANAN AIR

D"%$"-.%" $'!a#a# a"-''#ama#* %'*"$"*a ,a#$'!a#a# ma!%"m.m $'+a," ,"

$'#*a0 l''#* ,'#*a# #"la"%'!"$a ;5γ 9H ;

D"%$"-.%" $'!a#a# a" "#" ,aa$m'9a!"l" !o#,"%" al"#* '!%$"ma#* m.#*!"# $'+a," %'lama0.+a# %a#*a$ l'-a$ ,a# l''#*$'+'#.0!a#



15/21

D"a#**a lo#*%oa# -a+" $'+a," a,a *a"% 53 7a!$o!'ama#a##a a,ala0

FAKTOR KEAMANAN (HOEK ET AL, 1973)

1A3 1B ? !o0'%" -",a#* A ,a# B

A3 B ? %.,.$ *'%' ,alam -",a#* A ,a# B ? -o-o$ "%" -a$.a#

9 ? -o-o$ a"

H ? $"#**" $o$al -a+"3=3A3B ? 7a!$o a#* -'!a"$a# ,'#*a# ,"m'#%" -a+"



16/21

ψ a 3 ψ - ? !'m""#*a#

-",a#* A ,a# B

Ψ 5 ? ," !'m""#*a#

*a"% 'o$o#*a#(*a"% 5)

S.,.$&%.,.$ ,aa$,".!. a,a %$''o#'$

FAKTOR A3 B3 3 =



17/21

DATA ONTOH KASUS LONGSORANBAJI

HTKB462 & Lo#*%oa# Ba+" C>

T"#**" $o$al -a+" ? 4 mBo-o$ "%" -a$.a# ? 25!N/m:

Bo-o$ "%" a" ? ;@C!N/m:


18/21

Gam-a -.%. ,a# !.$.-(ol') -",a#*!'$",a!m'#'.%a# A ,a# B

Gam-a -.%. l''#* ,a#l''#* a$a%

B' " #omo $ " $ "! &$ " $ "! a#*m'9a!" l " *a "% 'o$o#*a#

C ? 'o$o#*a# -",a#* A,'#*a# !'m" "#*a# l''#*3 2? 'o$o#*a# -",a#* B,'#*a# !'m" "#*a# l''#*3 :? 'o$o#*a# -",a#* A,'#*a# !'m" "#*a# l''#*a$a%3 4 ? 'o$o#*a#-",a#*3 5 ? 'o$o#*a#

-",a#* A ,a# B

U!. -'a"#* θC : ,a# θ : 5 a,a

-",a#* A; U!. -'a"#* θ2 4,a# θ4 5 a,a -",a#* B

T'# $.!a# aa0 lo#*%oa#,'#*a# m'#a"! *a"% ,a".%a$ %$''o#'$ !' $ "$ "! 5;

U!. l.#*' (ψ 5) ; HTKB462 & Lo#*%oa# Ba+" C@

LANGKAH ENGERJAAN


19/21

H.-.#*!a# !.$.- -",a#* A(Na) ,a# !.$.- -",a#* B (N -)

,alam -.%. a#* %ama3*am-a ,'#*a# *a"% .$.%&.$.%; U!. -'a"#* θ# a ; # -

H.-.#*!a# !.$.- -",a#* B

(N-) ,'#*a# $"$"! C3 *am-a,'#*a# *a"% .$.%&.$.%;U!. -'a"#* θC ; # -

H.-.#*!a# !.$.- -",a#* A(Na) ,'#*a# $"$"! 23 *am-a

,'#*a# *a"% .$.%&.$.%;U!. -'a"#*

θ2 ; # aMa%.!!a# #"la""la" a#*

,"'ol'0 .#$.! m'#*0"$.#*7a!$o A3 B3 3 ,a# =

H"$.#* 7a!$o !'ama#a# (FS)

HTKB462 & Lo#*%oa# Ba+" C

LANGKAH ENGERJAAN


20/21

LEMBAR ERHITUNGANKASUS LONGSORAN BAJI



21/21

Ho'!3 J; Ba3 E; C@C; Ro1! Slo'E#*"#''"#*; Lo#,o#3 I#%$"$.$"o# o7 M"#"#* a#,M'$all.*;

Kl"10'3 ;A; C; Ro1! Slo' S$a-"l"$;L"$$l'$o#3 So1"'$ 7o M"#"#*3 M'$all.*3 a#,Eloa$"o#3 I#1; (SME)

Wll"'3 D;; Ma0 ;W; 24; Ro1! Slo'E#*"#''"#*; N'9 =o!3 Talo Fa#1"%;

REFERENSI

HTKB462 & Lo#*%oa# Ba+" 2C

7_Longsoran Baji

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