Perhitungan Bronjong Palembang

 Perhitungan Bronjong

B

b1 b1 b1 b1

q

sho H

H

BRONJONG Z

H

Pa

H

Titik tinjau Mguling

shao

shz

H

shpo

O

CHECK CHECK Gaya geser geser Hori sont al

LB=

2

m

D=

2

m

pa

D

sha = g.h.Ka - 2.c.√Ka s ha o = 0.000 h=0 shad = 0.979 h=D shp = g.h.Kp + 2.c.√Kp 1.904 h=0 shpo = h=D shpd = 7.100

pp

t/m2

shad

shpd L

LB

Pa = 7.676 pa=  s hao x D + D/2 x ( shad - shao) = 0.000

x

Ha= Ha= Pa+p Pa+pa a =

8.655 t/m'

2

+

2 /2 x (

0.979

-

0.000 ) =

0.979 t/m'

pp=  s hpo x D + D/2 x ( shpd - shpo) = 1.904

x

c x (L+LB) = 0.770

x

2 (

+ 4

2 /2 x ( +

2

7.100

-

)

Hp= pp+cx(L+LB) =

13.624 t/m' Faktor Keamanan

SH= Ha-Hp

-4.968 t <0-->Hp>Ha aman

Geser Gaya Horisontal SF =Hp/Ha = 1.574

CHECK Stabilitas Lereng dgn Metoda Bishop d idapat :

Faktor Keamanan : SF=1.613, R= 32.5m Program Slope Stability, Stabil 2.3 A. Verruijt, 1986

1.904 ) =

9.004 t/m'

=

4.620 t/m'

DATA LONGSOR1 Density (BJ) :

g =

2.20

t/m3

Est. strength :

qu =

50

kg/cm2

H=

Density (BJ) :

g =

1.7

t/m3

L=B+(n-1)xb1

Sudut Geser :

f =

12.06

Cohesion :

c=

0.77

Tinggi Timbunan :

Z=

5

m

a=

1.107

rad =

q=

0

t/m2

t=

1.342

m

B=

2

m

Faktor Keamanan

b1=

0.5

m

Momen Guling pada titik O

Bronjong, Tanah,

CHECK Momen Guling pada titik O

o

1.00

= B-b1=

t/m2

m

4

m

1.5

m 63

O

nlayer =

5 SF=Mp/Ma= 9.4204 Menurut Rankine ,  Koefisien Tanah Aktif, Ka= tan (45-f/2) = 0.654 Koefisien Tanah Pasif, Kp=tan (45+f/2) =

1.528

Momen Guling Aktif Ma pd titik O

p

h

m=pxh

sh = g.h.Ka + q.Ka - 2.c.√Ka h=0 -> sho = h=Z -> shz =

{t}

{m}

{t m}

1.90

-1.246

t/m2

(6.229)

 

2.500

(15.572)

4.316

t/m2

13.905

 

1.667

23.175

P(t/m')=

H(m)=

Ma (tm/m')=

7.676

0.990

7.603

Gaya Horisontal Pa(t/m')=

7.676 Momen Guling Pasif Mp pd titik O tnh dibwh bronjong 8.50 w tnh

l tnh

t 0

-

1

bronjong

27.63

22.00

wxl

wbrj

t.m

t

44.00 lbrj

Mp (tm/m')=

wxl

71.625

t.m

Berat konstruksi

 -

4.00

  -

  4.40

 3.00

13.20  

Wp(t/m')=

 1.00

 0.85

 3.75

  3.19

  4.40

 2.50

11.00

30.500

2

 2.00

 1.70

 3.50

  5.95

  4.40

 2.00

8.80

3

 3.00

 2.55

 3.25

  8.29

  4.40

 1.50

6.60

c bronjong (kg/cm2)=

4

 4.00

 3.40

 3.00

10.20

  4.40

 1.00

4.40

c =qu/2= 25 Tahanan geser  horisontal (t/m') 375 Tahanan geser 

4.50

min (t/m') 335

 Perhitungan Bronjong

B

b1

b1

b1

q

sho H

H

BRONJONG Z

H

Pa

H

Titik tinjau Mguling

shao

shz

H

shpo

O

CHECK Gaya geser Hori sont al

LB=

2

m

D=

2

m

pa

D

sha = g.h.Ka - 2.c.√Ka shao = 0.000 h=0 shad = 2.232 h=D shp = g.h.Kp + 2.c.√Kp 0.673 h=0 shpo = h=D shpd = 6.312

pp

t/m2

shad

shpd L

LB

Pa = 6.631 pa=  s hao x D + D/2 x ( shad - shao) = 0.000

x

Ha= Pa+pa =

8.863 t/m'

2

+

2 /2 x (

2.232

-

0.000 ) =

2.232 t/m'

pp=  s hpo x D + D/2 x ( shpd - shpo) = 0.673

x

c x (L+LB) = 0.280

x

2 (

+ 5.5

2 /2 x ( +

2

6.312

-

)

Hp= pp+cx(L+LB) =

9.085 t/m' Faktor Keamanan

SH= Ha-Hp

-0.221 t <0-->Hp>Ha aman

Geser Gaya Horisontal SF =Hp/Ha = 1.025

CHECK Stabilitas Lereng dgn Metoda Bishop d idapat :

Faktor Keamanan : SF=1.613, R= 32.5m Program Slope Stability, Stabil 2.3 A. Verruijt, 1986

0.673 ) =

6.985 t/m'

=

2.100 t/m'

DATA LONGSOR1 Density (BJ) :

g =

2.20

t/m3

Est. strength :

qu =

50

kg/cm2

H=

Density (BJ) :

g =

1.95

t/m3

L=B+(n-1)xb1

Sudut Geser :

f =

10.5

o

Cohesion :

c=

0.28

t/m2

Tinggi Timbunan :

Z=

3.5

m

a=

0.611

rad =

q=

0

t/m2

t=

0.287

m

B=

1.5

m

Faktor Keamanan

b1=

1

m

Momen Guling pada titik O

Bronjong, Tanah,

CHECK Momen Guling pada titik O

0.70

m

=

5.5

m

B-b1=

0.5

m 35

O

nlayer =

5 SF=Mp/Ma= 12.727 Menurut Rankine ,  Koefisien Tanah Aktif, Ka= tan (45-f/2) = 0.692 Koefisien Tanah Pasif, Kp=tan (45+f/2) =

1.446

Momen Guling Aktif Ma pd titik O

p

h

m=pxh

sh = g.h.Ka + q.Ka - 2.c.√Ka h=0 -> sho = h=Z -> shz =

{t}

{m}

{t m}

0.67

-0.466

t/m2

(1.630)

1.750

(2.853)

4.255

t/m2

8.262

1.167

9.639

P(t/m')=

H(m)=

Ma (tm/m')=

6.631

1.023

6.786

Gaya Horisontal Pa(t/m')=

6.631 Momen Guling Pasif Mp pd titik O tnh dibwh bronjong 13.65 w tnh

l tnh

t 0

-

1

bronjong

54.60

11.55

wxl

wbrj

t.m

t

31.76 lbrj

Mp (tm/m')=

wxl

86.363

t.m

Berat konstruksi

 -

5.50

  -

  2.31

 4.75

10.97  

Wp(t/m')=

 1.00

 1.37

 5.00

  6.83

  2.31

 3.75

8.66

25.200

2

 2.00

 2.73

 4.50

12.29

  2.31

 2.75

6.35

3

 3.00

 4.10

 4.00

16.38

  2.31

 1.75

4.04

c bronjong (kg/cm2)=

4

 4.00

 5.46

 3.50

19.11

  2.31

 0.75

1.73

c =qu/2= 25 Tahanan geser  horisontal (t/m') 125 Tahanan geser 

2.65

min (t/m') 72

BOR PILE/SHEET PILE