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TINJAUAN LAPANGAN
Lokasi : Jalan lintas Padang-
Bukittinggi,Lembah Anai,Sumatera
Barat
Oleh :
Kelompok I
Anggota Kelompok :
• Yuliandra
• Syafril Maidi
• Yuni Rafika Rahmi
• Dodi Iswandi
• Gandha Syahputra
• Hengki Ade Satria
• Windi Silvia
• Hendly Syaputra
• Joni Pradinata
• Al Anhar Hardianto
• Dwi Reta Ramadhanti
• Fandi Aulia Sofyan
Daerah Pengamatan
 Jalan Lintas Padang-Bukittinggi, Kawasan
Lembah Anai Sumatera Barat
 Ditempuh ± 1,5 jam perjalanan darat dari
kota Padang
 Kondisi Cuaca : Mendung
 Waktu Pengamatan : Kamis, 11 Desember
2014/ Pukul 15.30 WIB
Koordinat : S 000 29’ 27.1” E 1000 20’ 20.2 “
Lereng yang diamati
Family Kekar
Deskripsi Batuan
Nama Batuan : Granit
Jenis Batuan : Batuan Beku Intermediet
Warna : Abu-abu
Struktur : Masif
Tekstur
a. Derajat Kristalisasi : Hipokristalin
b. Granulitas : Fenerik
c. Bentuk Kristal : Subhedral
d. Hubungan : Equigranular
Proses Pengukuran
Hasil Pengukuran
Lereng setinggi 24.725 meter (Menggunakan
Kompas Geologi )
 Jenis Batuan : Batuan Beku Intermediet
(Granit)
Ada 3 Famili kekar secara umum dengan jarak
antar kekar rata-rata 30 cm
Per 1/2 meternya ada 2 kekar pada tebing
Lebar kekar yang terbesar=2 mm
Kekar yang terbentuk keras/ tidak rapuh
Bidang (Tebing) :Strike/Dip : N 300 °E/50°
 Family Kekar
a. Family 1 : N 190°E/50 ° (ada 3 kekar)
b. Family 2 : N 110°E/10 ° (ada 4 kekar, salah
satunya kekar terbesar)
c. Family 3 : N 95 °E/45° (ada 3 kekar)
Jarak Kekar dan Family Kekar
Penentuan kualitas batuan dinding
tebing dengan sistem RMR
Penentuan RQD (metode tidak langsung)
Priest dan Hudson (1976, error 5%)
RQD = 100 e-0.1 l (0.1 l + 1)
l = frequency discontinuities per meter
Maka:
Jumlah famili kekar =3
jumlah spasi famili kekar=7.5 m
Spasi rata-rata famili kekar = 7.5/3= 2.5 m
λ= 1/spasi kekar rata2
= 0.4 kekar/m
Maka:
RQD = 100 e-0.1 l (0.1 l + 1)
= 100 e-0.1 x0.4 ((0,1 x 0.4) +1)
= 96.56 %
Kualitas batuan pada lereng sangat baik
Hasil Pengujian Sampel
• Kuat batuan: 90 MPa
• Penentuan nilai RMR batuan adalah sebagai berikut:
Kuat tekan = 90 MPa bobot: 7
RQD = 96.56 % bobot: 20
Jarak Kekar = 0.3 m bobot: 15
Kondisi Kekar dinding agak kasar, pemisahan < 1 mm
bobot: 25
Kondisi air tanah lembab bobot: 10
Jumlah bobot bobot: 72
• Maka
RMR batuan : 72
Hubungan RMR dengan Sudut lereng
{Laubscher (1975)}
Kesimpulan
Kemiringan lereng 650, sesuai dengan yang
disarankan.
Kualitas batuan sangat baik berdasarkan nilai
RQD = 96,56%
Pembobotan batuan baik (RMR=72)
Kondisi kandungan air pada batuan lembab
Tidak kemungkinan terjadi longsor karena
kondisi lereng aman

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Geotek lapangan

  • 1. TINJAUAN LAPANGAN Lokasi : Jalan lintas Padang- Bukittinggi,Lembah Anai,Sumatera Barat Oleh : Kelompok I
  • 2. Anggota Kelompok : • Yuliandra • Syafril Maidi • Yuni Rafika Rahmi • Dodi Iswandi • Gandha Syahputra • Hengki Ade Satria • Windi Silvia • Hendly Syaputra • Joni Pradinata • Al Anhar Hardianto • Dwi Reta Ramadhanti • Fandi Aulia Sofyan
  • 3. Daerah Pengamatan  Jalan Lintas Padang-Bukittinggi, Kawasan Lembah Anai Sumatera Barat  Ditempuh ± 1,5 jam perjalanan darat dari kota Padang  Kondisi Cuaca : Mendung  Waktu Pengamatan : Kamis, 11 Desember 2014/ Pukul 15.30 WIB
  • 4. Koordinat : S 000 29’ 27.1” E 1000 20’ 20.2 “
  • 6.
  • 8.
  • 9. Deskripsi Batuan Nama Batuan : Granit Jenis Batuan : Batuan Beku Intermediet Warna : Abu-abu Struktur : Masif Tekstur a. Derajat Kristalisasi : Hipokristalin b. Granulitas : Fenerik c. Bentuk Kristal : Subhedral d. Hubungan : Equigranular
  • 11. Hasil Pengukuran Lereng setinggi 24.725 meter (Menggunakan Kompas Geologi )  Jenis Batuan : Batuan Beku Intermediet (Granit) Ada 3 Famili kekar secara umum dengan jarak antar kekar rata-rata 30 cm Per 1/2 meternya ada 2 kekar pada tebing Lebar kekar yang terbesar=2 mm
  • 12. Kekar yang terbentuk keras/ tidak rapuh Bidang (Tebing) :Strike/Dip : N 300 °E/50°  Family Kekar a. Family 1 : N 190°E/50 ° (ada 3 kekar) b. Family 2 : N 110°E/10 ° (ada 4 kekar, salah satunya kekar terbesar) c. Family 3 : N 95 °E/45° (ada 3 kekar)
  • 13. Jarak Kekar dan Family Kekar
  • 14. Penentuan kualitas batuan dinding tebing dengan sistem RMR Penentuan RQD (metode tidak langsung) Priest dan Hudson (1976, error 5%) RQD = 100 e-0.1 l (0.1 l + 1) l = frequency discontinuities per meter Maka: Jumlah famili kekar =3 jumlah spasi famili kekar=7.5 m Spasi rata-rata famili kekar = 7.5/3= 2.5 m λ= 1/spasi kekar rata2 = 0.4 kekar/m
  • 15. Maka: RQD = 100 e-0.1 l (0.1 l + 1) = 100 e-0.1 x0.4 ((0,1 x 0.4) +1) = 96.56 % Kualitas batuan pada lereng sangat baik
  • 16. Hasil Pengujian Sampel • Kuat batuan: 90 MPa • Penentuan nilai RMR batuan adalah sebagai berikut: Kuat tekan = 90 MPa bobot: 7 RQD = 96.56 % bobot: 20 Jarak Kekar = 0.3 m bobot: 15 Kondisi Kekar dinding agak kasar, pemisahan < 1 mm bobot: 25 Kondisi air tanah lembab bobot: 10 Jumlah bobot bobot: 72 • Maka RMR batuan : 72
  • 17. Hubungan RMR dengan Sudut lereng {Laubscher (1975)}
  • 18. Kesimpulan Kemiringan lereng 650, sesuai dengan yang disarankan. Kualitas batuan sangat baik berdasarkan nilai RQD = 96,56% Pembobotan batuan baik (RMR=72) Kondisi kandungan air pada batuan lembab Tidak kemungkinan terjadi longsor karena kondisi lereng aman