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ANALISA TEKANAN TANAH AKTIF

Model Struktur :

 Analisa Tekanan Lateral Tanah

Z = -12.70 1 = n.h1.Ka1 +sub.h1.Ka1 + q.Ka1 – 2.C1.Ka1

= (1,57x 4 x 0,704) + (0,57 x 8.70 x 0,70)+ (0.5x0,704) – (2x3.6x0,83)

= 4.42 + 3.61 + 0.408 – 5.976

= 2,40 t/m2

Penentuan posisi tegangan nol

aktif = n.h1.Ka2 +sub.h1.Ka2 + sub.h2. Ka2.+ q.Ka2 – 2.C2.Ka2

= (1,57 x 4 x 1,00) + (0,57 x 9.0 x 1,00)+ (0,70 x h x 1,00) + (0.5x 1,00) –

( 2 x 11.3 x 1)

= 6.28 + 5.13 + 0.7.h + 0.5 – 22.6

Data properties tanah :

sat = 1,57 t/m3

Cu = 0.36 kg/cm2 ; C’ = 0 kg/cm2 

  = 10  ; ’ = 10 Ka = tan2 (45 - /2)

= 0,704

Ka = 0,83

-1.20

-17.00

SURCHARGE 0,50 t/m2

-12.70

sat = 1,75t/m3

 Cu = 2.66 kg/cm2 ; C’ = 0 kg/cm2 

 = 0 ;’ = 35 Ka = tan2 (45 - /2)

= 1

Ka = 1

-13.00

sat = 1,70 t/m3

 Cu = 1.13 kg/cm2 ; C’ = 0 kg/cm2 

 = 0 ;’ = 28 Ka = tan2 (45 - /2)

= 1Ka = 1

Silty clayStiff to very stiff

 N = 17 - 47

Cemented silty

clay, hard

 N = 40 - 60

Silty Clay

Medium Stiff tostiff

 N = 2 - 10

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  = 0.7.h + 5.15 t/m2

 pasif = sub.h2. Kp2.+ 2.C2.Kp2 

= 0.7.h + 22.60 t/m2 ----------  pasif > aktif

Dari hasil analisa tersebut dapat disimpulkan bahwa kondisi zero stress tercapai pada

kedalaman 12.70 m di bagian dasar galian.

Diagram tek. Lateral superposisi :

Dari hasil analisa tekanan lateral tersebut kemudian diinputkan sebagai gaya luar

sehingga menghasilkan nilai gaya – gaya dalam Sodlier pile pada setiap kondisi yaitu

sebagai berikut :

-1.20

-12.70 m2.40 t/m2 8.70 t/m2

m.a.t -4.00 m

11.1t/m

Tek. Tanah Tek. Air  Diagram Tek. Lateral superposisi

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Permodelan struktur

12.16 t/m2-12.70 m

-20.0 m

7.72 t/m2 

-4.00 m

-8.00 m

11.1 t/m2

4.23 t/m2

Diagram Tek. Lateral superposisi Tahap galian-1 Tahap galian-2 Tahap galian-3

Anchor-1 Anchor

Anchor

ks-1

ks-2ks-2

ks-1

ks-3 ks-3

ks-3

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 Analisa Gaya Ground Anchor

Gaya anchor-1 :

Fh = 0.5 x 7.72 x 8.00= 30.88 ton

Fanchor = Fh/cos α = 43.67 ton/m’

Jarak pemasangan setiap 3.60 mTotal Fanchor.1 = 157 ton

-13.00 m

7.72 t/m2 

-8.00 m

Anchor-1

-3.75 m

Data properties tanah :sat = 1,57 t/m3

Cu = 0.36 kg/cm2 ; C’ = 0 kg/cm2 

  = 10  ; ’ = 10 Ka = tan2 (45 - /2)

= 0,704

Ka = 0,83

sat = 1,70 t/m3

 Cu = 1.13 kg/cm2 ; C’ = 0 kg/cm2 

 = 0 ;’ = 28 Ka = tan2 (45 - /2)

= 1

Ka = 1

-17.00 m

 sat = 1,75t/m3

 Cu = 2.66 kg/cm2 ; C’ = 0 kg/cm2 

 = 0 ;’ = 35 Ka = tan2 (45 - /2)

= 1

Ka = 1

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Ground Anchor-2

Gaya anchor-2 :Fh =( 6.06 x 3.5) + (0.5 x 5.04 x 3.5)

= 30.03 ton

Fanchor = Fh/cos α 

= 42.46 ton/m’

Jarak pemasangan setiap 3.60 mTotal Fanchor.2 = 153 ton

11.1 t/m2 

Anchor-1

-3.75 m

-7.50 m

-11.50 m

Data properties tanah :

sat = 1,57 t/m3

Cu = 0.36 kg/cm2 ; C’ = 0 kg/cm2 

  = 10  ; ’ = 10 Ka = tan2 (45 - /2)

= 0,704

Ka = 0,83

-11.50 m

 sat = 1,70 t/m3

 Cu = 1.13 kg/cm2 ; C’ = 0 kg/cm2 

 = 0 ;’ = 28 Ka = tan2 (45 - /2)

= 1

Ka = 1 -16.00 m

 sat = 1,75t/m3

 Cu = 2.66 kg/cm2 ; C’ = 0 kg/cm2 

 = 0 ;’ = 35 Ka = tan2 (45 - /2)

= 1

Ka = 1

6.06 t/m2