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LERENG

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Tujuan Instruksioal Umum

Mahasiswa dapat menganalisis danmendisain lereng.

Tujuan Instruksioal Khusus

Mahasiswa dapat menghitung angka keamanan lerengbaik jangka pendek maupun jangka panjang.

Mampu mengetahui kemungkinan terjadinya longsordan mengetahui cara mendisain ulang lereng yang telah

longsor Mampu memperlakukan lereng sebagai sarana

infrastruktur ataupun bangunan.

Pada akhir masa studi mahasiswa mampu menguasai

program aplikasi untuk merencanakan dan menganalisislereng seperti PLAXIS & GEOSLOPE

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Permasalahan

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Permasalahan

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Case Study:Failure of Driven PilesUsed to Increase Slope

Stability

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Sequence of Construction in the Tender Document

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Pelaksanaan di Lapangan

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Solution

Backfill

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Permasalahan

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Contoh stabilisasi lereng

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Contoh stabilisasi lereng

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Pokok bahasan yang harus dikuasaisebelum belajar lereng

Tegangan efektif Kuat geser tanah

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h1, 1

h2, 2

h3, 3

h4, 4

h5, 5

hw

= h1 x 1 + h2 x 2+ h3 x 3 + h4 x 4 + h5 x 5

= . hhw.w = -

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Kuat Geser Tanah

Kenapa untuk tanah digunakan KuatGeser?

Kenapa bukan kuat tarik, atau kuattekan?

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= s

s = c + tan

c

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Kuat Geser Material

Mohr-Coulomb:

Tegangan total:

tanncS

Tegangan efektif:

''' tan ucS n dimana:

S dan S= kuat geser total dan efektif,

c dan c = kohesi total dan efektif,

dan = sudut geser dalam total dan

efektif,

n = tegangan normal,

U = tekanan air pori

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Drained Shear Strength

''' tan ucS n

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Evaluasi Parameter Kuat Geser dan PemilihanProsedure Pengujian di Laboratorium

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Triaxial CD analyses

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Triaxial CU analyses

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Triaxial UU analyses

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Stabilitas timbunan dan galianlempung NC

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Tabel 2

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Tekanan Air Pori

Permukaan air tanahtetap:

u = wzw Permukaan air tanah

berpindah-pindah:

u = whudimana:

w= berat volume air,

zw= kedalaman di bawah

muka air tanah,

hu= pressure head

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Peak dan Ultimate Strength

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Hubungan antara Index Plastisitasdan Sudut Geser Residual

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PENGUJIAN KUAT GESER TANAH

PENGUJIAN LABORATORIUM

DIRECT SHER

TRIAXIAL

UNCONFINED COMPRESSION TEST

PENGUJIAN LAPANGAN

SONDIR

BOR, N-SPT

VANE SHEAR

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Pengujian Kuat GeserTanah dng Direct Shear Test

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= normal stress = normal forceare of cross-section of the sample

= shear strength = resisting shear force

are of cross-section of the sample

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Triaxial Testing

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C

Pasir

Lempung

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Triaxial Testing:

CD Consolidated Drained

CU Consolidated Undrained

UU Unconsolidated Undrained

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Unconfined Compression Test

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Sondir/ Dutch Cone Penetration Test (CPT)

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Fr =fqc

%

89.2 /

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Fr =fqc

%

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Pemboran dengan Mesin Bor

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Pemboran dengan Mesin Bor

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Country Hammer

Type

Hammer ReleaseEstimated Rod

Energy (%)

Correction Factor for

60% Rod Energy

Donut Free Fall 78 78/60 = 1.30Japan Donut Rope an Pulley with

special throw release

67 67/60 = 1.12

Safety Rope and Pulley 60 60/60 = 1.00USA

Donut Rope and Pulley 45 45/60 = 0.75

Argentina Donut Rope and Pulley 45 45/60 = 0.75

Donut Free Fall 60 60/60 = 1.00China

Donut Rope and Pulley 50 50/60 = 0.83

Summary of Energy Ratio for Various SPT Procedures

(after Prof. Bolton Seed)

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SiltyFineSand, Greyish Brown

SiltyCoral Rock few Sand,wheteishGrey

Silty Coral Rockfewshell fragment, whiteish

6

2

5

4

8

7

8

11

6

18

16

11

4

11

11

20

9

SUBSOIL PROFILE:

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TANK-1 NEW LOCATION ENJINIRINGENJINIRING

BT-1.0 (EL+0.377)BT-1.2 (EL+0.795) BT-1.3N (EL+0.995)

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Relationship between Cohesion and N-Value (Cohesive soil)

0.6 N

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Keruntuhan yg sebenarnya

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Tipe-tipe keruntuhan lereng

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Tipe-tipe keruntuhan lereng

Kriteria Perencanaan

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Konsep Safety Factor

Limit Equilibrium Method

SF=MresistanceMdriving


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Konsep Safety Factor

Safety Factor of Materials Parameter

ankeseimbangkondisimencapaiuntukdibutuhkanyang

tersediayangmaksimum

S

SSF

rrc

cSF

tan

tan


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Temporary Permanent Temporary Permanent

No human building 1.3 1.5 1.25 1.3

Many human building 1.5 2 1.3 1.5

Environmentalcondition

Accuracy of soil parameters

Less accurate Accurate

Temporary Permanent Temporary Permanent

No human building 1.3 1.5 1.25 1.3

Many human building 1.5 2 1.3 1.5

Environmentalcondition

Accuracy of soil parameters

Less accurate Accurate

Small Large

Cost of repair comparable to cost of

construction. No danger to human life or

other property if slope fails

1.25 1.5

Cost of repair much greater than cost of

construction or danger to human life or

other valuable property if slope fails

1.5 2

Costs and consequences of slope

failure

Uncertainty of strength

Measurements

Small Large

Cost of repair comparable to cost of

construction. No danger to human life or

other property if slope fails

1.25 1.5

Cost of repair much greater than cost of

construction or danger to human life or

other valuable property if slope fails

1.5 2

Costs and consequences of slope

failure

Uncertainty of strength

Measurements

Gambar Penampang

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Gambar Penampang

Timbunan

Galian

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Documents