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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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Kriteria Perencanaan
Konsep Safety Factor
Limit Equilibrium Method
SF=MresistanceMdriving
Kriteria Perencanaan
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Kriteria Perencanaan
Konsep Safety Factor
Safety Factor of Materials Parameter
ankeseimbangkondisimencapaiuntukdibutuhkanyang
tersediayangmaksimum
S
SSF
rrc
cSF
tan
tan
Kriteria Perencanaan
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Kriteria Perencanaan
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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