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Oleh :

FEBRI DENI FIRDIANSYAH

111.100.041

Disusun Sebagai Salah Satu Syarat

ntu! "e#$er%leh &elar Sar'ana (S1) *e!ni! &e%l%gi

Y%gya!arta+ , Dese#ber -01

"enyetu'ui+ "enyetu'ui+

D%sen /e#bi#bing I D%sen /e#bi#bing II

Ir. /urant%+ ".*. Herry Risani+ S.*+ ".*.

NI/.12203- 123205 1 001 NI/. - 3-01 10 0-2 1

"engetahui+

6etua /r%i *e!ni! &e%l%gi

/N 7 8eteran9 Y%gya!arta

Ir. H. Sugeng Rahar'%+ ".*.

NI/. 1231-03 122-05 1 001

ii

&EOO&I DAN ANAISIS 6ES*ABIAN EREN&

N*6 RE6O"ENDASI *A"BAN& *ERB6A /*.INDO"IN;O "ANDIRI+

DAERAH S6A RAH"A*+ 6E;A"A*AN *E6 /ANDAN+

6AB/A*EN 6*AI *I"R+ /RO8INSI 6AI"AN*AN *I"R

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HAA"AN /ERSE"BAHAN

iii

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;A/AN *ERI"A6ASIH,

iv

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Oleh :

Febri Deni Firiansyah

111.110.051

SARI

Lokasi penelitian termasuk dalam kawasan ijin usaha tambang PT.

Indominco Mandiri daerah Suka Rahmat, Kecamatan Teluk Pandan, Kabupaten

Kutai Timur, Proinsi Kalimantan Timur. Secara geogra!is daerah telitian terletak

pada koordinat "#$"%" m& ' "(("%" m& dan )(%%% m& ' )$%%% m& *TM +S

-( ona "%&.

Secara emor!ologi daerah penelitian dibagi atas satu bentuk asal /aitubentuk asal struktural, kemudian dibagi menjadi bentuk lahan berupa perbukitan

homoklin 0S1)2 dan lembah homoklin 0S112. Pola pengaliran /ang berkembang pada

daerah telitian /aitu directional trellis, merupakan ubahan dari pola dasar trellis

karena pengaruh dari struktur lipatan. 3aerah telitian berada pada sa/ap lipatan

Runtu Sinklin.

Stratigra!i daerah telitian dibagi menjadi empat satuan, urutan satuan batuan

dari /ang paling tua adalah satuan batupasir Pulaubalang 0Miosen 4wal ' Miosen

Tengah2, satuan batulempung 5alikpapan 0Miosen Tengah ' Miosen 4khir2, satuan

batugamping 5alikpapan 0Miosen 4khir2, dan satuan endapan aluial 06olosen2.

Lapisan pembawa batubara berada pada satuan batupasir Pulaubalang dan saatuan

batulempung 5alikpapan.

Struktur geologi /ang berkembang adalah sesar mendatar kanan berarah

Timur Laut ' 5arat 3a/a. 3an kekar dengan arah umum 5arat Laut ' Tenggara.

5erdasarkan analisis dengan metode SMR dan perhitungan !aktor keamanan

dengan metode 5ishopsimplified, maka direkomendasikan lereng tambang terbuka

dengan kemiringan sudut lereng keseluruhan (overall slope) 7%8. Lereng /ang

direkomendasikan pada lereng tunggal 0single slope2 memiliki lebar jenjang ( meter

dengan tinggi lereng $," meter dan sudut tiap lereng tunggal 9%8. Target dari seam

batubara /ang akan ditambang /aitu seam :9 pada satuan batulempung 5alikpapan.

Litologi lereng didominasi oleh meterial lempung, untuk itu perlu dilakukan

analisis si!at kimia dari batulempung ini. Tujuann/a untuk mengetahui jenis minerallempung /ang terkandung dalam lereng tersebut, karena pada mineral lempung

tertentu akan mempengaruhi stabilitas dari lereng tambang. Perlu dilakukan

pemboran geologi teknik pada lokasi lain /ang memiliki target seam batubara /ang

sama untuk mendapatkan hasil geometri lereng /ang lebih representati!.

Kata kunci ;

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DAF*AR ISI

HAA"AN

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1.)%.1 Mor!ologi 3aerah ............................................................................... )%

1.)%.# Struktur eologi.................................................................................. )%

1.)%.( Iklim ................................................................................................... ))

1.)%." 6asil Kerja Manusia............................................................................ ))

1.)%.7 eometri Lereng ................................................................................. ))

1.)%.9 Pengaruh 4ir Tanah ............................................................................ ))

1.)%.- Si!at

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(.).1.1 Lembah 6omoklin 0S112 ......................................................... #$

(.).1 Pola Pengaliran 3aerah Penelitian ....................................................... (%

(.1 Stratigra!i 3aerah Penelitian .......................................................................... (1

(.1.) Satuan 5atupasir Pulaubalang .............................................................. (#

(.1.).) Litologi Pen/usun .................................................................... (#

(.1.).1 Pen/ebaran dan Ketebalan ....................................................... ((

(.1.).# *mur ........................................................................................ ((

(.1.).( Mekanisme dan Lingkungan Pengendapan ............................. ((

(.1.)." 6ubungan Stratigra!i ................................................................ ("

(.1.1 Satuan 5atulempung 5alikpapan ......................................................... (-(.1.1.) Litologi Pen/usun .................................................................... (-

(.1.1.1 Pen/ebaran dan Ketebalan ....................................................... ($

(.1.1.# *mur ........................................................................................ ($

(.1.1.( Mekanisme dan Lingkungan Pengendapan ............................. ($

(.1.1." 6ubungan Stratigra!i ................................................................ ")

(.1.# Satuan 5atugamping 5alikpapan ......................................................... "#

(.1.#.) Litologi Pen/usun .................................................................... "#

(.1.#.1 Pen/ebaran dan Ketebalan ....................................................... "#

(.1.#.# *mur ........................................................................................ "(

(.1.#.( Mekanisme dan Lingkungan Pengendapan ............................. "(

(.1.#." 6ubungan Stratigra!i ................................................................ "(

(.1.( Satuan >ndapan 4luial ....................................................................... "-

(.1.(.) Litologi Pen/usun .................................................................... "-

(.1.(.1 Pen/ebaran dan Ketebalan ....................................................... "-

(.1.(.# *mur ........................................................................................ "-

(.1.(.( Mekanisme dan Lingkungan Pengendapan ............................. "-

(.1.(." 6ubungan Stratigra!i ................................................................ "-

(.# Struktur eologi 3aerah Penelitian ................................................................ "$

(.#.1 Kekar .................................................................................................... "$

(.#.1 Sesar Mendatar Kanan Teluk Pandan ................................................... 7)

(.( Sejarah eologi 3aerah Penelitian ................................................................. 71

viii

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BAB 8 ANAISIS 6ES*ABIAN EREN& N*6 RE6O"ENDASI

*A"BAN& *ERB6A

".) Pengamatan dan Pengambilan 3ata eologi Teknik ..................................... 79

".).) Kondisi Lereng 4lami .......................................................................... 79

".).1 Struktur eologi 3aerah Penelitian ..................................................... 7-

".).# 3ata 5or ............................................................................................... 7-

".).#.) ?ariasi Litologi ......................................................................... 7-

".).#.1Rock Quality esignation 0RQ2 dan Core Recovery............... 7-

".1 *ji eologi Teknik ......................................................................................... 7$

".# 4nalisis Kestabulan Lereng ............................................................................ 9)".#.) Slope Mass Rating (SMR)..................................................................... 9)

".#.1

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DAF*AR &A"BAR

ambar I.) Peta lokasi daerah penelitian 0sumber; 54K@S*RT4&4L2............................................................................................................

............................................................................................................

#

ambar 1.) 3iagram alir penelitian

....................................................................................................................................

....................................................................................................................................

9

ambar 1.1 Pengaruh tekanan air pada suatu blok

....................................................................................................................................

....................................................................................................................................

)1

ambar 1.# Longsoran bidang

....................................................................................................................................

....................................................................................................................................

)(

ambar 1.( Tiga dimensi longsoran baji

........................................................................................................................................................................................................................................................................

)"

ambar 1." Kondisi longsoran baji

....................................................................................................................................

....................................................................................................................................

)"

ambar 1.7 Longsoran busur

....................................................................................................................................

....................................................................................................................................

)7

ambar 1.9 Longsoran guling

....................................................................................................................................

....................................................................................................................................

)9

ambar 1.- a/a /ang bekerja pada irisan 5ishop 0+esle/, )$992

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....................................................................................................................................

....................................................................................................................................

11

ambar 1.$ eometri lereng tambang terbuka

....................................................................................................................................

....................................................................................................................................

1#

ambar 1.)% Kondisi tegangan contoh uji triaksial

....................................................................................................................................

....................................................................................................................................

1-

ambar 1.))"lat direct s#ear $o%....................................................................................................................................

....................................................................................................................................

1$

ambar #.) Struktur geologi regional Kalimantan dan :ekungan Kutai 0Sat/ana

et al., )$$$2

..............................................................................................................

..............................................................................................................

#)

ambar #.1 Perkembangan tektonik :ekungan Kutai 06utchinson, )$$72

....................................................................................................................................

....................................................................................................................................

#)

ambar #.( 4rea lokasi penelitian 0Peta geologi lembar Sangatta, )$$72

....................................................................................................................................

....................................................................................................................................

#1

ambar #.( Kolom stratigra!i :ekungan Kutai 0Peta geologi lembar Sangatta,

)$$72

..............................................................................................................

..............................................................................................................

##

ambar #." Peta struktur geologi regional Kalimantan 0Rose dan 6artono, )$9-2

....................................................................................................................................

....................................................................................................................................

#7

xi

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ambar (.) 5atas antara lembah dan bukit 05rahmant/o et al., 1%%72

....................................................................................................................................

....................................................................................................................................

#7

ambar (.1 Kenampakan mor!ologi daerah penelitian

....................................................................................................................................

....................................................................................................................................

(%

ambar (.# Kenampakan sungai di daerah penelitian

....................................................................................................................................

....................................................................................................................................

()ambar (.( Pola pengaliran di daerah penelitian

....................................................................................................................................

....................................................................................................................................

(1

ambar (." Stratigra!i di daerah penelitian

....................................................................................................................................

....................................................................................................................................

(#

ambar (.7 Model lingkungan pengendapan satuan batupasir Pulaubalang

....................................................................................................................................

....................................................................................................................................

("

ambar (.9 Singkapan batupasir LP )9

....................................................................................................................................

....................................................................................................................................

(7

ambar (.- Singkapan batupasir LP )$....................................................................................................................................

....................................................................................................................................

(7

ambar (.$ Singkapan batulempung LP 1(

....................................................................................................................................

....................................................................................................................................

(9

ambar (.)% Singkapan batubara LP )7

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....................................................................................................................................

....................................................................................................................................

(9

ambar (.)) Singkapan kalkarenit LP #1

....................................................................................................................................

....................................................................................................................................

(-

ambar (.)1 Lingkungan pengendapan satuan batulempung 5alikpapan

....................................................................................................................................

....................................................................................................................................

"%

ambar (.)# Singkapan kontak selaras satuan batupasir Pulaubalang dengan

satuan batulempung 5alikpapan pada LP )9 dan kontak selaras

satuan batulempung 5alikpapan dengan satuan batugamping

5alikpapan pada LP #-

..............................................................................................................

..............................................................................................................

(7

ambar (.)( Singkapan batupasir LP )1

"1

ambar (.)" Singkapan batulempung LP ))

....................................................................................................................................

....................................................................................................................................

"1

ambar (.)7 Singkapan batubara LP -

....................................................................................................................................

....................................................................................................................................

"#

ambar (.)9 Singkapan kalkarenit LP #- /ang merupakan kontak selaras atuan

batulempung 5alikpapan dengan satuan batugamping 5alikpapan

..............................................................................................................

..............................................................................................................

""

ambar (.)- Singkapan kalkarenit LP ()

xiii

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....................................................................................................................................

....................................................................................................................................

""

ambar (.)$ Penampang ideal !asies karbonat tepi paparan 0+ilson, )$9" dalam

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....................................................................................................................................

....................................................................................................................................

7(

ambar (.1- Sejarah geologi daerah telitian 0Miosen 4wal ' Miosen 4khir2

....................................................................................................................................

....................................................................................................................................

7"

ambar (.1$ Sejarah geologi daerah telitian 0Miosen 4khir ' 6olosen2

....................................................................................................................................

....................................................................................................................................

77

ambar (.#% Kondisi daerah penelitian saat ini....................................................................................................................................

....................................................................................................................................

77

ambar ".) Kondisi lereng buatan dan lereng alami

....................................................................................................................................

....................................................................................................................................

7-

ambar ".1 Singkapan batubara seam target :9

....................................................................................................................................

....................................................................................................................................

7$

ambar ".# Penampang bor 1"1(

....................................................................................................................................

....................................................................................................................................

9"

ambar ".( Litologi dan data geologi teknik bor 1"1(

........................................................................................................................................................................................................................................................................

97

ambar "." 5idang gelincir circularpada lereng tunggal "18

....................................................................................................................................

....................................................................................................................................

99

ambar ".7 5idang gelincirplanarpada lereng tunggal "18

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....................................................................................................................................

....................................................................................................................................

99

ambar ".9 5idang gelincir circularpada lereng tunggal "78

....................................................................................................................................

....................................................................................................................................

9-

ambar ".- 5idang gelincirplanarpada lereng tunggal "78

....................................................................................................................................

....................................................................................................................................

9-

ambar ".$ 5idang gelincir circularpada lereng tunggal 7%8....................................................................................................................................

....................................................................................................................................

9$

ambar ".)% 5idang gelincirplanarpada lereng tunggal 7%8

....................................................................................................................................

....................................................................................................................................

9$

ambar ".)) 5idang gelincir circularpada lereng keseluruhan "18

....................................................................................................................................

....................................................................................................................................

-%

ambar ".)1 5idang gelincirplanarpada lereng keseluruhan "18

....................................................................................................................................

....................................................................................................................................

-)

ambar ".)# 5idang gelincir circularpada lereng low wall

........................................................................................................................................................................................................................................................................

-)

ambar ".)( 5idang gelincirplanarpada lereng low wall

....................................................................................................................................

....................................................................................................................................

-1

ambar ".)" 5idang gelincir circularpada lereng keseluruhan "78

xvi

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....................................................................................................................................

....................................................................................................................................

-1

ambar ".)7 5idang gelincirplanarpada lereng keseluruhan "78

....................................................................................................................................

....................................................................................................................................

-#

ambar ".)9 5idang gelincir circularpada lereng low wall

....................................................................................................................................

....................................................................................................................................

-#

ambar ".)- 5idang gelincirplanarpada lereng low wall....................................................................................................................................

....................................................................................................................................

-(

ambar ".)$ 5idang gelincir circularpada lereng keseluruhan 7%8

....................................................................................................................................

....................................................................................................................................

-(

ambar ".1% 5idang gelincirplanarpada lereng keseluruhan 7%8

....................................................................................................................................

....................................................................................................................................

-"

ambar ".1) 5idang gelincir circularpada lereng low wall

....................................................................................................................................

....................................................................................................................................

-"

ambar ".11 5idang gelincirplanarpada lereng low wall

........................................................................................................................................................................................................................................................................

-7

ambar ".1# Rekomendasi tahapan lerng tambang

....................................................................................................................................

....................................................................................................................................

-9

xvii

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DAF*AR *ABE

Tabel 1.) Klasi!ikasi Rock Mass Rating 05ienawski, )$9$2

....................................................................................................................................

....................................................................................................................................

)-

Tabel 1.1 Klasi!ikasi Slope Mass Rating 0Romana, )$-"2

....................................................................................................................................

....................................................................................................................................

)$

Tabel 1.# Tabel !aktor keamanan menurut 5owles 0)$-$2

....................................................................................................................................

....................................................................................................................................1%

Tabel (.) Klasi!ikasi kemiringan lereng 0?an Auidam, )$-#2

....................................................................................................................................

....................................................................................................................................

#-

Tabel (.1 Pemerian pembagian satuan bentuklahan daerah penelitian

....................................................................................................................................

....................................................................................................................................

#$

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Tabel (.# Tabulasi data s#ear oint

....................................................................................................................................

....................................................................................................................................

7%

Tabel ".) Summary hasil uji geologi teknik bor 1"1(

....................................................................................................................................

....................................................................................................................................

9%

Tabel ".1 Tabel pembobotan masa batuan

....................................................................................................................................

....................................................................................................................................

91Tabel ".# 6ubungan nilai RMR dengan rekomendasi sudut lereng

....................................................................................................................................

....................................................................................................................................

91

Tabel ".( 6asil perhitungan SMR pada bor 1"1(

....................................................................................................................................

....................................................................................................................................

9(

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xx

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DAF*AR /S*A6A

4llen, .P. and :hambers, )$$-, Sedimentation in t#e Modern and Miocene

Ma#akam elta, IP4.

5ieniawski, A. T., )$9$, >ngineering Rock Mass :lassi!ication, :op/Bright b/ Cohn

+ile/ D Sons.

5low, +. 6., )$7$, Late Middle >ocent to Recent Planctonic

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Sandi Stratigra!i Indonesia, )$$7; Sandi Stratigra!i Indonesia, dipublikasikan oleh

Ikatan 4hli eologi Indonesia, Cakarta.

Sandjaja, arth Scienses.

Swana, .+., Muslim, 3. Sophian, I., 1%)1, 3esain Lereng

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A"/IRAN

Lampiran 4 ; Peta Lintasan dan Lokasi Pengamatan

Lampiran 5 ; Peta eomor!ologi

Lampiran : ; Peta eologi

Lampiran 3 ; Pro!il

Lampiran > ; 4nalisa Petrogra!i

Lampiran < ; 4nalisa Paleontologi

Lampiran ; Log 5or eologi Teknik 1"1(

Lampiran 6 ; Poster Studi Khusus

xxiii