Deskripsi geoteknik

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Daftar Isi

DAFTAR ISI ............................................................................................................................................ i

DAFTAR TABEL .................................................................................................................................... iii

DAFTAR GAMBAR ............................................................................................................................... iv

DAFTAR FOTO ...................................................................................................................................... v

BAB 1. PENDAHULUAN ............................................................................................................. 1

1.1. Lokasi Daerah Penyelidikan ............................................................................................ 1

1.2. Maksud Dan Tujuan Penyelidikan .................................................................................. 2

1.3. Lingkup Pekerjaan .......................................................................................................... 2

1.3.1. Umum ................................................................................................................ 2

1.3.2. Investigasi Geoteknik ......................................................................................... 2

1.4. Metoda Investigasi ......................................................................................................... 2

1.4.1. Pemboran Inti .................................................................................................... 2

1.4.2. Bor Tangan ......................................................................................................... 3

1.4.3. Pengujian Penetrasi Standard. (Spt) .................................................................. 3

1.4.4. Pengujian Kelulusan Air ..................................................................................... 3

1.4.5. Ekstraksi Contoh Tanah Tak Terganggu ............................................................. 8

1.4.6. Pengujian Sondir ................................................................................................ 8

1.4.7. Pengujian Laboratorium .................................................................................... 8

BAB 2. KONDISI GEOLOGI ......................................................................................................... 1

2.1. Geologi Regional ............................................................................................................. 1

2.1.1. Fisiografi ............................................................................................................. 1

2.1.2. Stratigrafi ........................................................................................................... 1

2.1.3. Struktur Dan Tektonik ........................................................................................ 4

2.2. Geologi Lokal .................................................................................................................. 6

2.2.1. Geomorfologi ..................................................................................................... 6

2.2.2. Stratigrafi ......................................................................................................... 10

2.2.3. Daerah Potensi Longsor ................................................................................... 14

2.2.4. Struktur Geologi ............................................................................................... 15

BAB 3. HASIL INVESTIGASI GEOTEKNIK ..................................................................................... 1

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3.1. Kondisi Tanah Dan Batuan ............................................................................................. 1

3.1.1. Tingkat Pelapukan Batuan Dan Kekuatan .......................................................... 1

3.1.2. Kekuatan Batuan ................................................................................................ 2

3.1.3. Diskontinuitas .................................................................................................... 2

3.1.4. Kualitas Inti Pemboran (Rqd) ............................................................................. 2

3.1.5. Hasil Penyelidikan Lapangan ............................................................................. 3

3.2. Tanah .............................................................................................................................. 8

3.2.1. Pengujian Penetrasi Strandar (Spt) .................................................................... 8

3.2.2. Pengujian Sondir .............................................................................................. 13

3.3. Kondisi Hidrogeologi ..................................................................................................... 19

3.3.1. Air Tanah. ......................................................................................................... 19

3.3.2. Pengujian Kelulusan Air ................................................................................... 20

3.4. Kondisi Bawah Permukaan ........................................................................................... 22

3.4.1. Pusaka-1 ........................................................................................................... 22

3.4.2. Pusaka-3 ........................................................................................................... 23

3.5. Pengujian Laboratorium ............................................................................................... 23

BAB 4. REKOMENDASI UNTUK PARAMETER DESAIN ................................................................. 1

4.1. Lokasi Pusaka- 1 .............................................................................................................. 1

4.1.1. Kondisi Geologiteknik ........................................................................................ 1

4.1.2. Kondisi Hidrogeologi .......................................................................................... 4

4.1.3. Sifat-Sifat Tanah ................................................................................................. 5

4.1.4. Parameter Strengh Untuk Analisis Strabilitas .................................................. 13

4.2. Lokasi Pusaka- 3 ............................................................................................................ 15

4.2.1. Kondisi Geologiteknik ...................................................................................... 15

4.2.2. Kondisi Hidrogeologi ........................................................................................ 18

4.2.3. Sifat-Sifat Tanah ............................................................................................... 19

4.2.4. Parameter Strengh Untuk Analisis Strabilitas .................................................. 27

BAB 5. KESIMPULAN DAN SARAN ............................................................................................. 1

5.1. Kesimpulan ..................................................................................................................... 1

5.2. Saran ............................................................................................................................... 2

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Daftar Tabel

Tabel 1.1. Lingkup Dan Volume Pekerjaan Investigasi Lapangan Pusaka-1 ............................ 5

Tabel 1.2. Lingkup Dan Volume Pekerjaan Investigasi Lapangan Pusaka-3 ............................ 7

Tabel 3.1. Tingkat Pelapokan Batuan (Bs5930,1981) .............................................................. 1

Tabel 3.2. Kekuatan Batuan (Bs 5930,1981) ............................................................................ 2

Tabel 3.3. Hubungan Antara Kwalitas Inti Pemboran Dengan Diskontinuitas ........................ 3

Tabel 3.4. Jenis Batuan Dan Tingkat Pelapukan Batuan Pusaka-1 .......................................... 4

Tabel 3.5. Jenis Batuan Dan Tingkat Pelapukan Batuan Pusaka-3 .......................................... 6

Tabel 3.6. Klasifikasi Tanah Berbutir Halus Berdasarkan Nilai Nspt (Navac,1972) .............. 8

Tabel 3.7. Klasifikasi Tanah Berbutir Kasar Berdasarkan Nilai Nspt (Navac,1972) ................ 8

Tabel 3.8. Koreksi Nilai Lapangan SPT. (Modifikasi Dari Youd & Idriss, 1997) ........................ 9

Tabel 3.9. Hasil Pengujian SPT – pada Titik Bor di Pusaka-1 ................................................... 9

Tabel 3.10. Nilai Hasil Pengujian SPT – pada Titik Bor di Pusaka-3 ......................................... 11

Tabel 3.11. Klasifikasi Tanah Berdasarkan Atas Nilai Qc Untuk Tanah Berbutir Halus

(Schmertmann, 1974) ........................................................................................... 13

Tabel 3.12. Klasifikasi Tanah Berdasarkan Atas Nilai Qc Untuk Tanah Berbutir Halus

(Schmertmann, 1974) ........................................................................................... 14

Tabel 3.13. Klasifikasi Konsistensi/ Density dari Data Sondir Pusaka-1

Menurut (Schmertmann, 1974) ............................................................................ 16

Tabel 3.14. Klasifikasi Konsistensi/ Density dari Data Sondir Pusaka-3

Menurut (Schmertmann, 1974) ............................................................................ 18

Tabel 3.15. Kedalaman MAT Hasil Pemboran Di Pusaka-1...................................................... 20

Tabel 3.16. Tabel Kedalaman MAT Hasil Pemboran Di Pusaka-3 ............................................ 20

Tabel 3.17. Nilai Hasil Pengujian Permeabilitas Di Pusaka-1 ................................................... 21

Tabel 3.18. Nilai Hasil Pengujian Permeabilitas Di Pusaka-3 ................................................... 22

Tabel 3.19. Ringkasan Hasil Pengujian Laboratorium Pusaka-1(1) ......................................... 25



Tabel 3.22. Ringkasan Hasil Pengujian Laboratorium Pusaka-3 .............................................. 28

Tabel 4.1. Tingkat Pelapukan Batuan ...................................................................................... 2

Tabel 4.2. Kualitas Inti Pemboran (Rqd) .................................................................................. 3

Tabel 4.3. Pengamatan Muka Air Tanah (Water Table) .......................................................... 5

Tabel 4.4. Tingkat Pelapukan Batuan .................................................................................... 16

Tabel 4.5. Kualitas Inti Pemboran (Rqd) ................................................................................ 17

Tabel 4.6. Pengamatan Muka Air Tanah (Water Table) ........................................................ 18

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Daftar Gambar

Gambar 1-1. Lokasi Daerah Penyelidikan Terhadap Jawa Barat .................................................... 1

Gambar 2-1. Peta Geologi Regional Daerah Pusaka Dan Sekitarnya ............................................. 3

Gambar 2-2. Standard Seismik Untuk Bangunan (SNI 03-1726-2002) ........................................... 5

Gambar 3-1. Klasifikasi Tanah Berdasarkan Hasil Pengujian

Sondir Mekanis (Schmertmann, 1974) .................................................................... 14

Gambar 3-2. Densitas Relative Sebagai Fungsi Dari Ketahanan Konus Dan Vertical

Effective Stress.2. .................................................................................................... 15

Gambar 3-3. Hubungan Antara Qc Dan (Robertson And Campanella, 1983) .............................. 16

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Daftar Foto

Foto 1 - 1 Foto Aktifitas Pemboran ............................................................................................ 2

Foto 2 - 1 Bentang Alam Daerah Pusaka 1 & 2 .......................................................................... 5

Foto 2 - 2 Lembah Sungai Cibuni Pada Batu Pasir, Membentuk Lembah Berbentuk “V”

Dengan Tebing Terjal ................................................................................................. 6

Foto 2 - 3 Lembah Sungai Pada Lapisan Tufa Berbentuk “U” Dengan Tebing Landai ............... 7

Foto 2 - 4 Bongkah-Bongkah Breksi Dan Batupasir Berukuran 1 ~ 6 m Yang Merupakan

Hasil Jatuhan Dari Tebing Sungai Citandui ................................................................ 7

Foto 2 - 5 Satuan Geomorfik Punggungan Perbukitan .............................................................. 8

Foto 2 - 6 Satuan Geomorfik Punggungan Perbukitan .............................................................. 9

Foto 2 - 7 Satuan Geomorfik Dataran Bergelombang ............................................................... 9

Foto 2 - 8 Satuan Geomorfik Dataran Banjir ............................................................................. 9

Foto 2 - 9 Singkapan Satuan Batulempung Lanauan Berfosil Bentang.................................... 10

Foto 2 - 10 Fosil Molusca Pada Satuan Batulempung Lanauan Berfosil Bentang ..................... 11

Foto 2 - 11 Singkapan Satuan Batupasir Tuffan Koliberes ......................................................... 12

Foto 2 - 12 Singkapan Satuan Breksi Tuffan .............................................................................. 13

Foto 2 - 13 Singkapan Endapan Aluvial Sungai .......................................................................... 14

Foto 2 - 14 Gerakan Tanah Berupa Land Slide Di Pusaka-1 ....................................................... 14

Foto 2 - 15 Rock Fall Di Desa Cipamutih Pusaka-3..................................................................... 15

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Daftar Lampiran

Lampiran 1. Peta Geologi, Penampang Geologi, Log Bor Tangan, .................................................

Sondir dan Log Bor Pemboran Inti

Lampiran 2. Foto Contoh Inti Bor dan Kegiatan Lapangan

Lampiran 3. Perhitungan Permeability Test

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Deskripsi geoteknik