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CONTOH PERHITUNGAN UJI TRIAXIAL UU

Kalibrasi dial beban, LRC

= 0,102 kg/div

Kalibrasi dial vertikal

= 0,001 cm/div



Tegangan Keliling 0,5 kg/cm2

Diameter sampel, d

= 3,7 cm

Jari-jari sampel, r

= 1,85 cm

Tinggi sampel, H

= 7,73 cm

Luas alas sampel, A0

= π × r2 = 3,14 × 1,852 = 10,75 cm2

Vertical dial reading (div)

= 40 div

Vertical dial reading (cm)

= 40 × 0,001 = 0,040 cm

Load dial reading

= 28 div

Regangan, ɛ

= =

Vertical dial reading (cm) h 0,040

× 100%

× 100%

7,73

= 0,517 % Area corection factor

=1– =1–

ɛ 100 0,517 100

= 0,995

Triaxial UU | 4

Corrected Area. A'

= =

A0 Area correction factor 10,75 0,995

= 10,803 cm2 Beban, P

= Load dial reading × LRC = 28 × 0,102 = 2,856 kg

Deviator stress

= =

P A' 2,856 10,803

= 0,264 kg/cm2

Triaxial UU | 5

HASIL UJI TRIAXIAL UU

Nama Instansi

: Unika Soegijapranata

Nama Operator

: Kelompok 9B

Nama Proyek

: Praktikum Mekanika Tanah II Nama Engineer

: Kelompok 9B

Lokasi

: BSB Ngaliyan

Tanggal

: 25 Maret 2019

Deskripsi Tanah

: Tanah Merah Organik

Kedalaman

: 1,0 m

Jenis Tanah

: Undisturbed

Diameter sampel,d

: 3,7 cm

Tegangan Keliling

: 0,5 kg/cm2

Tinggi sampel, H

: 7,73 cm

Kalibrasi dial beban, LRC

: 0,102 kg/div

A0

: 10,75 cm2

Kalibrasi dial vertikal

: 0,001 cm/div

Tabel 5.1 Tabel Hasil Uji Triaxial Tegangan Keliling 0,5kg/cm2

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

d

e

f

g

Load Dial Reading (cm)

Regangan, ɛ b (H × 100%)

c

Deviator stress g ( ) f (kg/cm2) h

Triaxial UU | 6

Tabel 5.1 Tabel Hasil Uji Triaxial Tegangan Keliling 0,5kg/cm2 (Lanjutan)

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

d

e

f

g

Load Dial Reading (cm)

Regangan, ɛ b (H × 100%)

c

Deviator stress g ( ) f (kg/cm2) h

Triaxial UU | 7

Tabel 5.1 Tabel Hasil Uji Triaxial Tegangan Keliling 0,5kg/cm2 (Lanjutan)

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

d

e

f

g

Load Dial Reading (cm)

Regangan, ɛ (Hb × 100%)

c

Tegangan Deviator Maksimum (Δσ(1))

= 0,988 kg/cm2

Tegangan Utama (σ1(1))

= (σ3(1)) + (Δσ(1))

Deviator stress g ( ) f (kg/cm2) h

= 0,5 + 0,988 = 1,488 kg/cm2

Triaxial UU | 8

CONTOH PERHITUNGAN UJI TRIAXIAL UU

Kalibrasi dial beban, LRC

= 0,102 kg/div

Kalibrasi dial vertikal

= 0,001 cm/div



Tegangan Keliling 1 kg/cm2

Diameter sampel, d

= 3,7 cm

Jari-jari sampel, r

= 1,85 cm

Tinggi sampel, H

= 7,73 cm

Luas alas sampel, A0

= π × r2 = 3,14 × 1,852 = 10,75 cm2

Vertical dial reading (div)

= 40 div

Vertical dial reading (cm)

= 40 × 0,001 = 0,040 cm

Load dial reading

= 32 div

Regangan, ɛ

= =

Vertical dial reading (cm) h 0,040 7,73

× 100%

× 100%

= 0,517 % Area corection factor

ɛ

= 1 – 100 =1–

0,517 100

= 0,995

Triaxial UU | 9

Corrected Area. A'

=

=

A0 Area correction factor 10,75 0,995

= 10,803 cm2 Beban, P

= Load dial reading × LRC = 32 × 0,102 = 3,264 kg

Deviator stress

= =

P A' 3,264 10,803

= 0,302 kg/cm2

Triaxial UU | 10

HASIL UJI TRIAXIAL UU

Nama Instansi

: Unika Soegijapranata

Nama Operator

: Kelompok 9B

Nama Proyek

: Praktikum Mekanika Tanah II Nama Engineer

: Kelompok 9B

Lokasi

: BSB Ngaliyan

Tanggal

: 25 Maret 2019

Deskripsi Tanah

: Tanah Merah Organik

Kedalaman

: 1,0 m

Jenis Tanah

: Undisturbed

Diameter sampel,d

: 3,7 cm

Tegangan Keliling

: 1 kg/cm2

Tinggi sampel, H

: 7,73 cm

Kalibrasi dial beban, LRC

: 0,102 kg/div

A0

: 10,75 cm2

Kalibrasi dial vertikal

: 0,001 cm/div

Tabel 5.2 Tabel Hasil Uji Triaxial Tegangan Keliling 1 kg/cm2

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

d

e

f

g

Load Dial Reading (cm)

Regangan, ɛ b (H × 100%)

c

Deviator stress g ( ) f (kg/cm2) h

Triaxial UU | 11

Tabel 5.2 Tabel Hasil Uji Triaxial Tegangan Keliling 1 kg/cm2 (Lanjutan)

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

d

e

f

g

Load Dial Reading (cm)

Regangan, ɛ (Hb × 100%)

c

Deviator stress g ( ) f (kg/cm2) h

Triaxial UU | 12

Tabel 5.2 Tabel Hasil Uji Triaksial Teganan Keliling 1 kg/cm2 (Lanjutan)

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

d

e

f

g

Load Dial Reading (cm)

Regangan, ɛ (Hb × 100%)

c

Deviator stress g ( ) f (kg/cm2) h

Triaxial UU | 13

Tegangan Deviator Maksimum (Δσ(2))

= 1,107 kg/cm2

Tegangan Utama (σ1(2))

= (σ3(2)) + (Δσ(2)) = 1 + 1,107 = 2,107 kg/cm2

Triaxial UU | 14

CONTOH PERHITUNGAN UJI TRIAXIAL UU

Kalibrasi dial beban, LRC

= 0,102 kg/div

Kalibrasi dial vertikal

= 0,001 cm/div



Tegangan Keliling 2 kg/cm2

Diameter sampel, d

= 3,8 cm

Jari-jari sampel, r

= 1,9 cm

Tinggi sampel, H

= 7,86 cm

Luas alas sampel, A0

= π × r2 = 3,14 × 1,92 = 11,34 cm2

Vertical dial reading (div)

= 40 div

Vertical dial reading (cm)

= 40 × 0,001 = 0,040 cm

Load dial reading

= 29 div

Regangan, ɛ

= =

Vertical dial reading (cm) h 0,040 7,86

× 100%

× 100%

= 0,509% Area corection factor

ɛ

= 1 – 100 =1–

0,509 100

= 0,995

Triaxial UU | 15

Corrected Area. A'

=

=

A0 Area correction factor 11,34 0,995

= 11,393 cm2 Beban, P

= Load dial reading × LRC = 29 × 0,102 = 2,958 kg

Deviator stress

= =

P A' 2,958 11,393

= 0,260 kg/cm2

Triaxial UU | 16

HASIL UJI TRIAXIAL UU

Nama Instansi

: Unika Soegijapranata

Nama Operator

: Kelompok 10A

Nama Proyek

: Praktikum Mekanika Tanah II Nama Engineer

: Kelompok 10A

Lokasi

: BSB Ngaliyan

Tanggal

: 25 Maret 2019

Deskripsi Tanah

: Tanah Merah Organik

Kedalaman

: 1,0 m

Jenis Tanah

: Undisturbed

Diameter sampel,d

: 3,8 cm

Tegangan Keliling

: 2,0 kg/cm2

Tinggi sampel, H

: 7,86 cm

Kalibrasi dial beban, LRC

: 0,102 kg/div

A0

: 11,34 cm2

Kalibrasi dial vertikal

: 0,001 cm/div

Tabel 5.3 Tabel Hasil Uji Triaxial Tegangan Keliling 2,0 kg/cm2

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

Deviator stress g ( ) f (kg/cm2)

d

e

f

g

h

Load Dial Reading (cm)

Regangan, ɛ b (H × 100%)

c

Triaxial UU | 17

Tabel 5.3 Tabel Hasil Uji Triaxial Tegangan Keliling 2,0 kg/cm2 (Lanjutan)

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

d

e

f

g

Load Dial Reading (cm)

Regangan, ɛ b (H × 100%)

c

Deviator stress g ( ) f (kg/cm2) h

Triaxial UU | 18

Tabel 5.3 Tabel Hasil Uji Triaxial Tegangan Keliling 2,0 kg/cm2 (Lanjutan)

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

d

e

f

g

Load Dial Reading (cm)

Regangan, ɛ b (H × 100%)

c

Deviator stress g ( ) f (kg/cm2) h

Triaxial UU | 19

Tabel 5.3 Tabel Hasil Uji Triaxial Tegangan Keliling 2,0 kg/cm2 (Lanjutan)

Vertical Dial Reading (div) a

Vertical Dial Reading (a×kalibrasi vertikal) (cm) b

(%)

Area Correction Factor ɛ (1- 100 )

Corrected Area (A'), 𝐴0 ( 𝑒 )(cm2)

Beban (P), (c×LRC) (Kg)

d

e

f

g

Load Dial Reading (cm)

Regangan, ɛ b (H × 100%)

c

Tegangan Deviator Maksimum (Δσ(3))

= 1,826 kg/cm2

Tegangan Utama (σ1(3))

= (σ3(3)) + (Δσ(3))

Deviator stress g ( ) f (kg/cm2) h

= 2 + 1,826 = 3,826 kg/cm2

Triaxial UU | 20

GRAFIK UJI TRIAXIAL UU

Nama Instansi

: Unika Soegijapranata

Nama Operator

: Kelompok 9B

Nama Proyek

: Praktikum Mekanika Tanah II

Nama Engineer

: Kelompok 9B

Lokasi

: BSB Ngaliyan

Tanggal

: 25 Maret 2019

Deskripsi Tanah

: Tanah Merah Organik

Kedalaman

: 1,0 m

Jenis Tanah

: Undisturbed Perbandingan antara Tegangan Deviator dan Regangan.

2

Tegangan Deviator, σ (kg/cm2)

1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0.0 0.6 1.3 1.9 2.5 3.2 3.8 4.5 5.1 5.7 6.4 7.0 7.6 8.3 8.9 9.5 10.2 10.8 11.5 12.1 12.7 13.4 14.0

Regangan, ɛ (%) Teg. Keliling 0,5 kg/cm2

Teg.Keliling 1kg/cm2

Teg.Keliling 2 kg/cm2

Grafik 5.1 Grafik Perbandingan antara Tegangan Deviator dan Regangan.

Triaxial UU | 21

LINGKARAN MOHR UJI TRIAXIAL UU Nama Instansi

: Unika Soegijapranata

Nama Operator

: Kelompok 9B

Nama Proyek

: Praktikum Mekanika Tanah II

Nama Engineer

: Kelompok 9B

Lokasi

: BSB Ngaliyan

Tanggal

: 25 Maret 2019

Deskripsi Tanah

: Tanah Merah Organik

Kedalaman

: 1,0 m

Jenis Tanah

: Undisturbed

Grafik 5.2 Grafik Perbandingan antara Tegangan Geser dan Tegangan Normal

Nilai yang didapat : cu

= 0,15 kg/cm2

ɸ

= arc tan

2 10

= 11,31°

Triaxial UU | 22

GAMBAR TANAH HASIL UJI TEKAN TRIAXIAL Nama Instansi

: Unika Soegijapranata

Nama Operator

: Kelompok 9B

Nama Proyek

: Praktikum Mekanika Tanah II

Nama Engineer

: Kelompok 9B

Lokasi

: BSB Ngaliyan

Tanggal

: 25 Maret 2019

Deskripsi Tanah

: Tanah Merah Organik

Kedalaman

: 1,0 m

Jenis Tanah

: Undisturbed

Uji 1 : Tegangan Keliling : 0,5 kg/cm2

Uji 2 : Tegangan Keliling : 1,0 kg/cm2

Triaxial UU | 23

Uji 3 : Tegangan Keliling : 2,0 kg/cm2

Triaxial UU | 24

KESIMPULAN 1. Berikut adalah tabel hubungan antara consistency index dan cu sebagai berikut: Tabel 5.4 Tabel konsistensi Tanah Menurut Nilai Kohesi

cu (kg/cm2)

Consistency Very Soft (sangat lunak)

<0,125 0,125 – 0,25

Soft (lunak)

0,25 – 0,5

Medium Stiff (agak kaku) Stiff (kaku)

0,5 – 1

Very Stiff (sangat kaku)

1– 2

Hard (keras)

>2

(Sumber : http://eprints.undip.ac.id/34078/5/1924_CHAPTER_II.pdf)

Menurut Tabel 5.4 nilai cu yang diadapatkan sebesar 0,15 kg/cm2 sehingga tanah yang di uji memiliki konsistensi soft (lunak).

2. Tabel dibawah merupakan hubungan sudut geser dengan kepadatan tanah sebagai berikut: Tabel 5.5 Tabel Kepadatan Tanah Menurut Sudut Geser

Class

Sudut Geser

Silty sand, sand- silt mix

SM

34

Clayey sand, sand- clay mix

SC

31

Silt and clayey silts

ML

32

Clay of low plasticity

CL

28

Clayey silts, elasticsilt

MH

25

Clay of hight plasticity

CH

19

Soil Description

Lempung padat

>30

Lempung lunak

<19

(Sumber:http://slideshare.net/musliberjuangdotblogspotdocom/praktek-penyelidikan-tanah)

Menurut Tabel 5.5 nilai sudut geser yang diadapatkan sebesar 11,31° sehingga tanah yang di uji memiliki klasifikasi lmpung lunak.

Triaxial UU | 25

DOKUMENTASI TRIAXIAL UU

NO.

Gambar 5.1

GAMBAR

KETERANGAN

Alat Triaxial (Sumber : Dokumentasi Pribadi)

Arloji penunjukan tekanan keliling Gambar 5.2

(kg/cm2) (Sumber : Dokumentasi Pribadi)

Gambar 5.3

Proving ring (Sumber : Dokumentasi Pribadi)

Triaxial UU | 26

NO.

Gambar 5.4

GAMBAR

KETERANGAN

Cetakan silinder sampel uji (Sumber : Dokumentasi Pribadi)

Dolly untuk mengeluarkan sampel Gambar 5.5

tanah dari cetakan (Sumber : Dokumentasi Pribadi)

Gambar 5.6

Load dial reading (Sumber : Dokumentasi Pribadi)

Triaxial UU | 27

NO.

GAMBAR

KETERANGAN

Vertical dial reading Gambar 5.7

(Sumber : Dokumentasi Pribadi)

Kompresor untuk memberikan Gambar 5.8

tegangan keliling (Sumber : Dokumentasi Pribadi)

Tanah hasil uji coba triaxial Gambar 5.9

Tegangan keliling 0,5 kg/cm2 (Sumber : Dokumentasi Pribadi)

Triaxial UU | 28

NO.

GAMBAR

KETERANGAN

Tanah hasil uji coba triaxial Gambar 5.10

Tegangan keliling 1 kg/cm2 (Sumber : Dokumentasi Pribadi)

Gambar 5.11

Tanah hasil uji coba triaxial Tegangan keliling 2 kg/cm2 (Sumber : Dokumentasi Pribadi)

Gambar 5.12

Sertifikat kalibrasi beban triaxial (Sumber : Dokumentasi Pribadi)

Triaxial UU | 29

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