8_kasus dan metode penanganan longsoran
TRANSCRIPT
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CONTOH KASUS dan METODEPENANGANANNYA
LONGSORAN JALAN TOLCIKAMPEK – PADALARANG
Bahan Ajar Pelatihan Keahlian Bidang Geoteknik JalanBanda Aceh 18 – 20 Maret 2013
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Identifikasi Longsoran Ruas Jalan PadalarangCikampek
Batu Datar Km. 91+000 – Km. 91+800:
– KM. 91+600 (daerah amblasan, dan longsoran dalam),
– KM. 91+900 (longsoran dangkal)
– KM. 92 (Pasir Honje, masalah stabilitas mahkota longsoran lama)
Lebak Ater Km. 96+000 – Km. 97+000:
– KM. 96+900 (longsoran dalam)
– KM. 96+750 (proteksi permukaan dan longsoran dangkal suksesif)
Bukit Indah KM. 70+600 (masalah gerusan saluran drainase)
Sadang KM. 74+500 (masalah pumping pada perkerasan)
Darangdan KM. 98+500 (longsoran dangkal)
Tegalnangklak KM. 83+000 – Km. 84+000 (longsoran dangkal)
Cilame KM. 113+000 – Km. 114+000 (stabilitas galian)
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Investigasi KERUSAKAN JALAN di Lapangan
• Bidang Geoteknik• Erosi permukaan lereng• Longsoran dangkal dan dalam
• Bidang Perkerasan• Pumping• Kerusakan tepi dan seal sambungan,• Retak, Gompal (spalling)• Rusak/kurang pengisi sambungan• Keausan mortar• Ketidakrataan perkerasan
• Bidang Jembatan• Retak• Kerusakan expansion joint, rubber
bearing• Fasilitas drainase yang hilang/rusak• Pelaksanaan pekerjaan beton• Perlindungan bangunan bawah
BidangBidang SistemSistem DrainaseDrainase•• PenyempitanPenyempitan saluransaluran•• SedimentasiSedimentasi saluransaluran•• KerusakanKerusakan saluransaluran•• BelumBelum adaada saluransaluran hilirhilir permanenpermanen•• BelumBelum adaada saluransaluran pengumpulpengumpul
aliranaliran laterallateral
BidangBidang VegetasiVegetasi dandan perlindunganperlindunganpermukaanpermukaan lerenglereng
•• PerlindunganPerlindungan lerenglereng yangyang sesuaisesuaiuntukuntuk jenisjenis tanahtanah yangyang adaada yaituyaitu
breksibreksi,, latosollatosol dandan serpihserpih..•• PelaksanaanPelaksanaan dandan pemeliharaanpemeliharaan
tanamantanaman
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Identifikasi Jenis Longsoran TimbunanClic
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Permasalahan Stabiltas Penanganan LongsoranTimbunan, TOL Cipularang
Counterweight Tambahan Setelah Longsor
Timbunan Tambahan setelah Longsor
Contoh Problem di lokasi KM 91 - 92
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CONTOH KASUS
LONGSORAN Alam (NATURAL SLOPE)AEK LATONG
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Gn. Sitoli
Banda Aceh
Meulaboh
Sibolga
Padang
Bengkulu
Bandar LampungAnyer
Singapura
Lokasi Aek Latong
Aek Latong
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Analisa Spasial(menggunakan Citra Satelit LANDSAT TM5
Menuju Lokasi:1. Dari Medan kurang lebih 10 jam memakai travel2. Dari Sipirok kurang lebih 30 menit
SIBOLGA
SIPIROK
TARUTUNG
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Foto dari udara Longsoran Aeklatong
Longsoran A
Longsoran BLongsoran C
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Foto dari udara Longsoran Aeklatong dan usulan Re-Lokasi Lokal
Relokasi A
Relokasi A, B dan C
Longsoran A
Longsoran BLongsoran C
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Foto dari udara Longsoran Aeklatong dan usulanKonstruksi Jembatan
Longsoran A
Longsoran BLongsoran C
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BENCANA LONGSOR
Shotcrete + Strip Drain
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BENCANA LONGSORAN GALIAN : Cadas pengeran
Pelandaian Lereng 300
Pelandaian Lerengdan Sheet piles
Pelebaran
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Bencana Longsoran Amblasan Badan Jalanpada Oprit jembatan, Bayung Lincir
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Bencana Alam / Banjir / Longsoran/ Lain – Lain ???????????????????
Mempengaruhi Stabilitas jalan
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Pergerakan Air / Lumpur Lapindo
Semburan Lumpur Panas Pembuatan Bendung Danau Lumpur Panas
Genangan Lumpur Panas Pengerukan Lumpur Jalan Tol tergenang LumpurPanas
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CONTOH KASUS Lainnya terkaitdengan Stabilitas Jalan
Pada Pelebaran Jalan
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Arah Pemadatan yang salah
± 80cm (tanah lembek)
Arah Pemadatan yang salah
Seharusnya
± 80cm tanah lembekbuang,ganti dengan selectedmaterial,padatkan lapis demilapis
Arah Pemadatan yang benarDimulai dari bawah ,dari pinggir ke tengahPemadatan lapis demi lapis
Sebelum ditimbun, buat penanggaan tanah
CARA PELAKSANAAN PENIMBUNAN DAN PEMADATAN pada PELEBARAN JALAN, YANGBERPOTENSI GAGAL dan menimbulkan Longsoran
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Perilaku Tanah Tropis DAS (1994), SNI dsb
• pemadatan tanah tropis pada kondisi diatas kadar air
optimum …. diperhatikan
– akan mempunyai kuat geser yang lebih tinggi tetapi
– berpotensial mengalami pengembangan.
– bila beban yang bekerja sedemikian besar maka akan
• merubah struktur tanah dan
• berakibat menurunkan kekuatannya.
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Proses Pelaksanaan dan Kegagalan pada TanahTropis
• Kenaikan Kadar Plastisitas: perubahan saat mixing (Sunaryo,1992, Mitchell,1982)
• Perubahan kekuatan geser dan daya dukung serta sifatkemampatanya– penurunan nilai permeabilitas karena naiknya kadar air akibat
orientasi partikel lempung, lambe (1958) dan Marbun (2000)– penurunan nilai permeabilitas karena naiknya kadar air akibat
orientasi partikel lempung sebab beban bertambah, Lambe (1958– proses pengembangan dan penyusutan tanah (swelling and shrinkage)
karena mineral lempung akan terangkat keluar akibat bertambahnyabeban (Seed and Chan, 1959)
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Penanganan Keruntuhan LerengTimbunan Tanah
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PENANGGULANGAN
KERUNTUHAN LERENG TANAH
TIMBUNAN: PENANAMAN RUMPUT, Vertifer
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STRUKTUR BRONJONG
STRUKTUR BRONJONG DENGAN FILTER
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PERKUATAN LERENG DENGAN GEOTEKSTILClick t
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PERKUATAN LERENG DENGAN GEOTEKSTILClick t
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DRAINASE LERENGClic
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Cotoh Penanganan Longsoran pada Pelebaran Timbunan JalanClic
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Penanganan Keruntuhan LerengGalian Tanah
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STRUKTUR LAPIS LINDUNG BATU
Material kedap air
Tanah pilihan
Pondasi
1 : 1.
2
Lubang pembuangan
Material kedap air (Sil beton)
Pondasi
Material urugan
Lubang pembuangan
Beton utk Landasan
Beton urugan
Block beton
Tanah pilihan
1 : 1.8 Material urugan
Block beton
(Satuan mm)
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Lubang penguat spasi 10cm
Lubang pembuangan9 mm .
Lapisan beton penguat tebal 250mm
Pondasi
1 : 1.
0
Tulangan penguat atau angker
Batuan
STRUKTUR LAPIS LINDUNG BETONClick t
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STRUKTUR BETON SEMPROTClic
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STRUKTUR BRONJONG
STRUKTUR BRONJONG DENGAN FILTER
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Lapisan kedap air
Tulangan pengaku
1 : 0
,3Lubang pembuangan air
Material Pondasi
1 : 0
,15
Urugan
Dinding penahan dari Beton
Pasangan pondasi batu kali
Beton pondasi
STRUKTUR TEMBOK PENAHAN TIPE SANDARANClic
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Cotoh Penanganan LongsoranPada Bidang Plane Failure
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Contoh PenangananLongsoran Bukit Tanah
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Contoh Penanganan Longsoran Pada TimbunanGalian Tebing
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Longsoran lereng pada Tebing Terjal
Sketsa Longsoran dengan Asumsi sulitt untukmenggeser kearah bukit
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Penanggulangan dengan Cantilever Structure
Diterapkan bila:1. Diatas tebing ada permukiman cukup jauh2. Ada kolam3. Daerah Hutan Lindung4. Kondisi bagian atas berupa tanah dan mudah longsor, plastisitas tinggi
Perlapisan untuk PenempatanPondasi berupa Batuan Segar1. Grade 1 dan 22. Mempunyai sisa untuk
menahan gaya geser3. Pelebaran kearah tebing tidak
dimungkinkan4. Ditebing atas material berupa
tanah dan tidak ada peluanguntuk dilandaikan
5. Ditebing atas berupa hutanlindung atau sumber air
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Penerapan dengan Timbunan RinganClic
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Penanganan KeruntuhanLereng Batuan
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STRUKTUR PENAMBATAN LERENG BATUAN
1
2
3
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Pondasi pasangan batu kali
Beton pondasi
1:0,
1
Dinding penahan dari Beton1:0,3
Diding pagar penahanruntuhan batuan
DINDING PENAHAN DAN PELINDUNG RUNTUHAN BATUAN
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Catchment Area : Runtuhan BatuClic
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Longsoran Banda Aceh - MeulabohClic
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Penanganan Longsoran BatuanClic
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Penanganan Keruntuhan LerengTimbunan Oprit Jembatan
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Perbedaan Karakteristik tanah Lunakdan Tanah Gambut serta Tanah
Ekspansif
Eddie Sunaryo PhD
Perbedaan Karakteristik tanah Lunak danTanah Gambut serta Tanah Ekspansif
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Kerikil / Batuan hasil Galian
STRUKTUR Pelat Injak pada Timbunan Oprit
Timbunan Ringan
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Tebal perkerasan 45cmLantai Beton =15cm
Fixed Member @ 1.500
Papan Beton = 10cm
Material terdainase
8.000%
Angker injeksi L = 7.500 @ 1.500
Deposit Coluvial
Tanah urugan dengan Batu Pecah
EPS
FootpathPavement 14cm
EPS
EPS2.000%
Tulangan Baja dengan Kuat Tarik Tinggi
Papan beton t =6cm
Lubang pembuangan air
Batas Pelindung
2.2. DINDING PENAHAN DAN Penggantian Material dengan BAHAN RINGAN
Mortar BetonRingan
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Tahapan MITIGASI LongsoranClic
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TERIMA KASIHAtas Perhatianya Bapak Ibu
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Soal Latihan
Jalan
Zona±10
Sheet Pile
11.00 m
Kondisi badan jalan semula
Kondisi Permukaan jalan
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